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Posted to commits@cassandra.apache.org by ty...@apache.org on 2015/03/26 23:45:23 UTC
[1/3] cassandra git commit: Fixes to index summary resampling on old
sstable formats
Repository: cassandra
Updated Branches:
refs/heads/trunk 3a6bcb5ae -> 8e115dac9
Fixes to index summary resampling on old sstable formats
Patch by Tyler Hobbs; reviewed by Benedict Elliot Smith for
CASSANDRA-8993
Project: http://git-wip-us.apache.org/repos/asf/cassandra/repo
Commit: http://git-wip-us.apache.org/repos/asf/cassandra/commit/7ff25f0d
Tree: http://git-wip-us.apache.org/repos/asf/cassandra/tree/7ff25f0d
Diff: http://git-wip-us.apache.org/repos/asf/cassandra/diff/7ff25f0d
Branch: refs/heads/trunk
Commit: 7ff25f0df55bf492e741730473b94bcba8ac6c0b
Parents: 93156d7
Author: Tyler Hobbs <ty...@datastax.com>
Authored: Thu Mar 26 17:36:19 2015 -0500
Committer: Tyler Hobbs <ty...@datastax.com>
Committed: Thu Mar 26 17:36:19 2015 -0500
----------------------------------------------------------------------
CHANGES.txt | 3 +
.../cassandra/io/sstable/Downsampling.java | 22 ++---
.../cassandra/io/sstable/IndexSummary.java | 1 +
.../io/sstable/IndexSummaryManager.java | 15 ++-
.../cassandra/io/sstable/SSTableReader.java | 96 +++++++++++++++++---
.../cassandra/io/sstable/IndexSummaryTest.java | 2 +-
6 files changed, 108 insertions(+), 31 deletions(-)
----------------------------------------------------------------------
http://git-wip-us.apache.org/repos/asf/cassandra/blob/7ff25f0d/CHANGES.txt
----------------------------------------------------------------------
diff --git a/CHANGES.txt b/CHANGES.txt
index 9bc314d..dba397c 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,4 +1,7 @@
2.1.4
+ * Avoid overwriting index summaries for sstables with an older format that
+ does not support downsampling; rebuild summaries on startup when this
+ is detected (CASSANDRA-8993)
* Fix potential data loss in CompressedSequentialWriter (CASSANDRA-8949)
* Make PasswordAuthenticator number of hashing rounds configurable (CASSANDRA-8085)
* Fix AssertionError when binding nested collections in DELETE (CASSANDRA-8900)
http://git-wip-us.apache.org/repos/asf/cassandra/blob/7ff25f0d/src/java/org/apache/cassandra/io/sstable/Downsampling.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/io/sstable/Downsampling.java b/src/java/org/apache/cassandra/io/sstable/Downsampling.java
index 6842b25..8455d0b 100644
--- a/src/java/org/apache/cassandra/io/sstable/Downsampling.java
+++ b/src/java/org/apache/cassandra/io/sstable/Downsampling.java
@@ -79,8 +79,8 @@ public class Downsampling
* Returns a list that can be used to translate current index summary indexes to their original index before
* downsampling. (This repeats every `samplingLevel`, so that's how many entries we return.)
*
- * For example, if [7, 15] is returned, the current index summary entry at index 0 was originally
- * at index 7, and the current index 1 was originally at index 15.
+ * For example, if [0, 64] is returned, the current index summary entry at index 0 was originally
+ * at index 0, and the current index 1 was originally at index 64.
*
* @param samplingLevel the current sampling level for the index summary
*
@@ -115,21 +115,11 @@ public class Downsampling
*/
public static int getEffectiveIndexIntervalAfterIndex(int index, int samplingLevel, int minIndexInterval)
{
- assert index >= -1;
- List<Integer> originalIndexes = getOriginalIndexes(samplingLevel);
- if (index == -1)
- return originalIndexes.get(0) * minIndexInterval;
-
+ assert index >= 0;
index %= samplingLevel;
- if (index == originalIndexes.size() - 1)
- {
- // account for partitions after the "last" entry as well as partitions before the "first" entry
- return ((BASE_SAMPLING_LEVEL - originalIndexes.get(index)) + originalIndexes.get(0)) * minIndexInterval;
- }
- else
- {
- return (originalIndexes.get(index + 1) - originalIndexes.get(index)) * minIndexInterval;
- }
+ List<Integer> originalIndexes = getOriginalIndexes(samplingLevel);
+ int nextEntryOriginalIndex = (index == originalIndexes.size() - 1) ? BASE_SAMPLING_LEVEL : originalIndexes.get(index + 1);
+ return (nextEntryOriginalIndex - originalIndexes.get(index)) * minIndexInterval;
}
public static int[] getStartPoints(int currentSamplingLevel, int newSamplingLevel)
http://git-wip-us.apache.org/repos/asf/cassandra/blob/7ff25f0d/src/java/org/apache/cassandra/io/sstable/IndexSummary.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/io/sstable/IndexSummary.java b/src/java/org/apache/cassandra/io/sstable/IndexSummary.java
index bad50b4..0ea0b48 100644
--- a/src/java/org/apache/cassandra/io/sstable/IndexSummary.java
+++ b/src/java/org/apache/cassandra/io/sstable/IndexSummary.java
@@ -86,6 +86,7 @@ public class IndexSummary extends WrappedSharedCloseable
this.offsets = offsets;
this.entries = entries;
this.samplingLevel = samplingLevel;
+ assert samplingLevel > 0;
}
private IndexSummary(IndexSummary copy)
http://git-wip-us.apache.org/repos/asf/cassandra/blob/7ff25f0d/src/java/org/apache/cassandra/io/sstable/IndexSummaryManager.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/io/sstable/IndexSummaryManager.java b/src/java/org/apache/cassandra/io/sstable/IndexSummaryManager.java
index 4144c32..0c196ff 100644
--- a/src/java/org/apache/cassandra/io/sstable/IndexSummaryManager.java
+++ b/src/java/org/apache/cassandra/io/sstable/IndexSummaryManager.java
@@ -259,6 +259,17 @@ public class IndexSummaryManager implements IndexSummaryManagerMBean
for (SSTableReader sstable : Iterables.concat(compacting, nonCompacting))
total += sstable.getIndexSummaryOffHeapSize();
+ List<SSTableReader> oldFormatSSTables = new ArrayList<>();
+ for (SSTableReader sstable : nonCompacting)
+ {
+ // We can't change the sampling level of sstables with the old format, because the serialization format
+ // doesn't include the sampling level. Leave this one as it is. (See CASSANDRA-8993 for details.)
+ logger.trace("SSTable {} cannot be re-sampled due to old sstable format", sstable);
+ if (!sstable.descriptor.version.hasSamplingLevel)
+ oldFormatSSTables.add(sstable);
+ }
+ nonCompacting.removeAll(oldFormatSSTables);
+
logger.debug("Beginning redistribution of index summaries for {} sstables with memory pool size {} MB; current spaced used is {} MB",
nonCompacting.size(), memoryPoolBytes / 1024L / 1024L, total / 1024.0 / 1024.0);
@@ -280,7 +291,7 @@ public class IndexSummaryManager implements IndexSummaryManagerMBean
Collections.sort(sstablesByHotness, new ReadRateComparator(readRates));
long remainingBytes = memoryPoolBytes;
- for (SSTableReader sstable : compacting)
+ for (SSTableReader sstable : Iterables.concat(compacting, oldFormatSSTables))
remainingBytes -= sstable.getIndexSummaryOffHeapSize();
logger.trace("Index summaries for compacting SSTables are using {} MB of space",
@@ -288,7 +299,7 @@ public class IndexSummaryManager implements IndexSummaryManagerMBean
List<SSTableReader> newSSTables = adjustSamplingLevels(sstablesByHotness, totalReadsPerSec, remainingBytes);
total = 0;
- for (SSTableReader sstable : Iterables.concat(compacting, newSSTables))
+ for (SSTableReader sstable : Iterables.concat(compacting, oldFormatSSTables, newSSTables))
total += sstable.getIndexSummaryOffHeapSize();
logger.debug("Completed resizing of index summaries; current approximate memory used: {} MB",
total / 1024.0 / 1024.0);
http://git-wip-us.apache.org/repos/asf/cassandra/blob/7ff25f0d/src/java/org/apache/cassandra/io/sstable/SSTableReader.java
----------------------------------------------------------------------
diff --git a/src/java/org/apache/cassandra/io/sstable/SSTableReader.java b/src/java/org/apache/cassandra/io/sstable/SSTableReader.java
index f5eef09..8fd7b85 100644
--- a/src/java/org/apache/cassandra/io/sstable/SSTableReader.java
+++ b/src/java/org/apache/cassandra/io/sstable/SSTableReader.java
@@ -26,16 +26,7 @@ import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.Comparator;
-import java.util.EnumSet;
-import java.util.HashSet;
-import java.util.Iterator;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
+import java.util.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
@@ -708,13 +699,39 @@ public class SSTableReader extends SSTable implements SelfRefCounted<SSTableRead
: SegmentedFile.getBuilder(DatabaseDescriptor.getDiskAccessMode());
boolean summaryLoaded = loadSummary(ibuilder, dbuilder);
+ boolean builtSummary = false;
if (recreateBloomFilter || !summaryLoaded)
+ {
buildSummary(recreateBloomFilter, ibuilder, dbuilder, summaryLoaded, Downsampling.BASE_SAMPLING_LEVEL);
+ builtSummary = true;
+ }
ifile = ibuilder.complete(descriptor.filenameFor(Component.PRIMARY_INDEX));
dfile = dbuilder.complete(descriptor.filenameFor(Component.DATA));
- if (saveSummaryIfCreated && (recreateBloomFilter || !summaryLoaded)) // save summary information to disk
+
+ // Check for an index summary that was downsampled even though the serialization format doesn't support
+ // that. If it was downsampled, rebuild it. See CASSANDRA-8993 for details.
+ if (!descriptor.version.hasSamplingLevel && !builtSummary && !validateSummarySamplingLevel())
+ {
+ indexSummary.close();
+ ifile.close();
+ dfile.close();
+
+ logger.info("Detected erroneously downsampled index summary; will rebuild summary at full sampling");
+ FileUtils.deleteWithConfirm(new File(descriptor.filenameFor(Component.SUMMARY)));
+ ibuilder = SegmentedFile.getBuilder(DatabaseDescriptor.getIndexAccessMode());
+ dbuilder = compression
+ ? SegmentedFile.getCompressedBuilder()
+ : SegmentedFile.getBuilder(DatabaseDescriptor.getDiskAccessMode());
+ buildSummary(false, ibuilder, dbuilder, false, Downsampling.BASE_SAMPLING_LEVEL);
+ ifile = ibuilder.complete(descriptor.filenameFor(Component.PRIMARY_INDEX));
+ dfile = dbuilder.complete(descriptor.filenameFor(Component.DATA));
+ saveSummary(ibuilder, dbuilder);
+ }
+ else if (saveSummaryIfCreated && builtSummary)
+ {
saveSummary(ibuilder, dbuilder);
+ }
}
/**
@@ -800,7 +817,9 @@ public class SSTableReader extends SSTable implements SelfRefCounted<SSTableRead
try
{
iStream = new DataInputStream(new FileInputStream(summariesFile));
- indexSummary = IndexSummary.serializer.deserialize(iStream, partitioner, descriptor.version.hasSamplingLevel, metadata.getMinIndexInterval(), metadata.getMaxIndexInterval());
+ indexSummary = IndexSummary.serializer.deserialize(
+ iStream, partitioner, descriptor.version.hasSamplingLevel,
+ metadata.getMinIndexInterval(), metadata.getMaxIndexInterval());
first = partitioner.decorateKey(ByteBufferUtil.readWithLength(iStream));
last = partitioner.decorateKey(ByteBufferUtil.readWithLength(iStream));
ibuilder.deserializeBounds(iStream);
@@ -826,6 +845,57 @@ public class SSTableReader extends SSTable implements SelfRefCounted<SSTableRead
}
/**
+ * Validates that an index summary has full sampling, as expected when the serialization format does not support
+ * persisting the sampling level.
+ * @return true if the summary has full sampling, false otherwise
+ */
+ private boolean validateSummarySamplingLevel()
+ {
+ // We need to check index summary entries against the index to verify that none of them were dropped due to
+ // downsampling. Downsampling can drop any of the first BASE_SAMPLING_LEVEL entries (repeating that drop pattern
+ // for the remainder of the summary). Unfortunately, the first entry to be dropped is the entry at
+ // index (BASE_SAMPLING_LEVEL - 1), so we need to check a full set of BASE_SAMPLING_LEVEL entries.
+ Iterator<FileDataInput> segments = ifile.iterator(0);
+ int i = 0;
+ int summaryEntriesChecked = 0;
+ int expectedIndexInterval = getMinIndexInterval();
+ while (segments.hasNext())
+ {
+ FileDataInput in = segments.next();
+ try
+ {
+ while (!in.isEOF())
+ {
+ ByteBuffer indexKey = ByteBufferUtil.readWithShortLength(in);
+ if (i % expectedIndexInterval == 0)
+ {
+ ByteBuffer summaryKey = ByteBuffer.wrap(indexSummary.getKey(i / expectedIndexInterval));
+ if (!summaryKey.equals(indexKey))
+ return false;
+ summaryEntriesChecked++;
+
+ if (summaryEntriesChecked == Downsampling.BASE_SAMPLING_LEVEL)
+ return true;
+ }
+ RowIndexEntry.Serializer.skip(in);
+ i++;
+ }
+ }
+ catch (IOException e)
+ {
+ markSuspect();
+ throw new CorruptSSTableException(e, in.getPath());
+ }
+ finally
+ {
+ FileUtils.closeQuietly(in);
+ }
+ }
+
+ return true;
+ }
+
+ /**
* Save index summary to Summary.db file.
*
* @param ibuilder
@@ -946,6 +1016,8 @@ public class SSTableReader extends SSTable implements SelfRefCounted<SSTableRead
*/
public SSTableReader cloneWithNewSummarySamplingLevel(ColumnFamilyStore parent, int samplingLevel) throws IOException
{
+ assert descriptor.version.hasSamplingLevel;
+
synchronized (tidy.global)
{
assert openReason != OpenReason.EARLY;
http://git-wip-us.apache.org/repos/asf/cassandra/blob/7ff25f0d/test/unit/org/apache/cassandra/io/sstable/IndexSummaryTest.java
----------------------------------------------------------------------
diff --git a/test/unit/org/apache/cassandra/io/sstable/IndexSummaryTest.java b/test/unit/org/apache/cassandra/io/sstable/IndexSummaryTest.java
index 0760aa3..9ed5b32 100644
--- a/test/unit/org/apache/cassandra/io/sstable/IndexSummaryTest.java
+++ b/test/unit/org/apache/cassandra/io/sstable/IndexSummaryTest.java
@@ -257,7 +257,7 @@ public class IndexSummaryTest
assertEquals(128, BASE_SAMPLING_LEVEL);
assertEquals(Arrays.asList(0, 32, 64, 96), Downsampling.getOriginalIndexes(4));
assertEquals(Arrays.asList(0, 64), Downsampling.getOriginalIndexes(2));
- assertEquals(Arrays.asList(), Downsampling.getOriginalIndexes(0));
+ assertEquals(Arrays.asList(0), Downsampling.getOriginalIndexes(1));
}
@Test
[3/3] cassandra git commit: Merge branch 'cassandra-2.1' into trunk
Posted by ty...@apache.org.
Merge branch 'cassandra-2.1' into trunk
Conflicts:
src/java/org/apache/cassandra/io/sstable/format/SSTableReader.java
Project: http://git-wip-us.apache.org/repos/asf/cassandra/repo
Commit: http://git-wip-us.apache.org/repos/asf/cassandra/commit/8e115dac
Tree: http://git-wip-us.apache.org/repos/asf/cassandra/tree/8e115dac
Diff: http://git-wip-us.apache.org/repos/asf/cassandra/diff/8e115dac
Branch: refs/heads/trunk
Commit: 8e115dac94e99eaa890212f8e2e008b3fb1b449e
Parents: 3a6bcb5 7ff25f0
Author: Tyler Hobbs <ty...@datastax.com>
Authored: Thu Mar 26 17:45:07 2015 -0500
Committer: Tyler Hobbs <ty...@datastax.com>
Committed: Thu Mar 26 17:45:07 2015 -0500
----------------------------------------------------------------------
CHANGES.txt | 3 +
.../cassandra/io/sstable/Downsampling.java | 22 ++---
.../cassandra/io/sstable/IndexSummary.java | 1 +
.../io/sstable/IndexSummaryManager.java | 15 +++-
.../io/sstable/format/SSTableReader.java | 85 +++++++++++++++++++-
.../cassandra/io/sstable/IndexSummaryTest.java | 2 +-
6 files changed, 107 insertions(+), 21 deletions(-)
----------------------------------------------------------------------
http://git-wip-us.apache.org/repos/asf/cassandra/blob/8e115dac/CHANGES.txt
----------------------------------------------------------------------
diff --cc CHANGES.txt
index 609c4a0,dba397c..1780249
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@@ -1,83 -1,7 +1,86 @@@
+3.0
+ * Compressed Commit Log (CASSANDRA-6809)
+ * Optimise IntervalTree (CASSANDRA-8988)
+ * Add a key-value payload for third party usage (CASSANDRA-8553)
+ * Bump metrics-reporter-config dependency for metrics 3.0 (CASSANDRA-8149)
+ * Partition intra-cluster message streams by size, not type (CASSANDRA-8789)
+ * Add WriteFailureException to native protocol, notify coordinator of
+ write failures (CASSANDRA-8592)
+ * Convert SequentialWriter to nio (CASSANDRA-8709)
+ * Add role based access control (CASSANDRA-7653, 8650, 7216, 8760, 8849, 8761, 8850)
+ * Record client ip address in tracing sessions (CASSANDRA-8162)
+ * Indicate partition key columns in response metadata for prepared
+ statements (CASSANDRA-7660)
+ * Merge UUIDType and TimeUUIDType parse logic (CASSANDRA-8759)
+ * Avoid memory allocation when searching index summary (CASSANDRA-8793)
+ * Optimise (Time)?UUIDType Comparisons (CASSANDRA-8730)
+ * Make CRC32Ex into a separate maven dependency (CASSANDRA-8836)
+ * Use preloaded jemalloc w/ Unsafe (CASSANDRA-8714)
+ * Avoid accessing partitioner through StorageProxy (CASSANDRA-8244, 8268)
+ * Upgrade Metrics library and remove depricated metrics (CASSANDRA-5657)
+ * Serializing Row cache alternative, fully off heap (CASSANDRA-7438)
+ * Duplicate rows returned when in clause has repeated values (CASSANDRA-6707)
+ * Make CassandraException unchecked, extend RuntimeException (CASSANDRA-8560)
+ * Support direct buffer decompression for reads (CASSANDRA-8464)
+ * DirectByteBuffer compatible LZ4 methods (CASSANDRA-7039)
+ * Group sstables for anticompaction correctly (CASSANDRA-8578)
+ * Add ReadFailureException to native protocol, respond
+ immediately when replicas encounter errors while handling
+ a read request (CASSANDRA-7886)
+ * Switch CommitLogSegment from RandomAccessFile to nio (CASSANDRA-8308)
+ * Allow mixing token and partition key restrictions (CASSANDRA-7016)
+ * Support index key/value entries on map collections (CASSANDRA-8473)
+ * Modernize schema tables (CASSANDRA-8261)
+ * Support for user-defined aggregation functions (CASSANDRA-8053)
+ * Fix NPE in SelectStatement with empty IN values (CASSANDRA-8419)
+ * Refactor SelectStatement, return IN results in natural order instead
+ of IN value list order and ignore duplicate values in partition key IN restrictions (CASSANDRA-7981)
+ * Support UDTs, tuples, and collections in user-defined
+ functions (CASSANDRA-7563)
+ * Fix aggregate fn results on empty selection, result column name,
+ and cqlsh parsing (CASSANDRA-8229)
+ * Mark sstables as repaired after full repair (CASSANDRA-7586)
+ * Extend Descriptor to include a format value and refactor reader/writer
+ APIs (CASSANDRA-7443)
+ * Integrate JMH for microbenchmarks (CASSANDRA-8151)
+ * Keep sstable levels when bootstrapping (CASSANDRA-7460)
+ * Add Sigar library and perform basic OS settings check on startup (CASSANDRA-7838)
+ * Support for aggregation functions (CASSANDRA-4914)
+ * Remove cassandra-cli (CASSANDRA-7920)
+ * Accept dollar quoted strings in CQL (CASSANDRA-7769)
+ * Make assassinate a first class command (CASSANDRA-7935)
+ * Support IN clause on any partition key column (CASSANDRA-7855)
+ * Support IN clause on any clustering column (CASSANDRA-4762)
+ * Improve compaction logging (CASSANDRA-7818)
+ * Remove YamlFileNetworkTopologySnitch (CASSANDRA-7917)
+ * Do anticompaction in groups (CASSANDRA-6851)
+ * Support user-defined functions (CASSANDRA-7395, 7526, 7562, 7740, 7781, 7929,
+ 7924, 7812, 8063, 7813, 7708)
+ * Permit configurable timestamps with cassandra-stress (CASSANDRA-7416)
+ * Move sstable RandomAccessReader to nio2, which allows using the
+ FILE_SHARE_DELETE flag on Windows (CASSANDRA-4050)
+ * Remove CQL2 (CASSANDRA-5918)
+ * Add Thrift get_multi_slice call (CASSANDRA-6757)
+ * Optimize fetching multiple cells by name (CASSANDRA-6933)
+ * Allow compilation in java 8 (CASSANDRA-7028)
+ * Make incremental repair default (CASSANDRA-7250)
+ * Enable code coverage thru JaCoCo (CASSANDRA-7226)
+ * Switch external naming of 'column families' to 'tables' (CASSANDRA-4369)
+ * Shorten SSTable path (CASSANDRA-6962)
+ * Use unsafe mutations for most unit tests (CASSANDRA-6969)
+ * Fix race condition during calculation of pending ranges (CASSANDRA-7390)
+ * Fail on very large batch sizes (CASSANDRA-8011)
+ * Improve concurrency of repair (CASSANDRA-6455, 8208)
+ * Select optimal CRC32 implementation at runtime (CASSANDRA-8614)
+ * Evaluate MurmurHash of Token once per query (CASSANDRA-7096)
+ * Generalize progress reporting (CASSANDRA-8901)
+ * Resumable bootstrap streaming (CASSANDRA-8838, CASSANDRA-8942)
+ * Allow scrub for secondary index (CASSANDRA-5174)
+
2.1.4
+ * Avoid overwriting index summaries for sstables with an older format that
+ does not support downsampling; rebuild summaries on startup when this
+ is detected (CASSANDRA-8993)
* Fix potential data loss in CompressedSequentialWriter (CASSANDRA-8949)
* Make PasswordAuthenticator number of hashing rounds configurable (CASSANDRA-8085)
* Fix AssertionError when binding nested collections in DELETE (CASSANDRA-8900)
http://git-wip-us.apache.org/repos/asf/cassandra/blob/8e115dac/src/java/org/apache/cassandra/io/sstable/IndexSummary.java
----------------------------------------------------------------------
http://git-wip-us.apache.org/repos/asf/cassandra/blob/8e115dac/src/java/org/apache/cassandra/io/sstable/IndexSummaryManager.java
----------------------------------------------------------------------
diff --cc src/java/org/apache/cassandra/io/sstable/IndexSummaryManager.java
index b35407c,0c196ff..81e487c
--- a/src/java/org/apache/cassandra/io/sstable/IndexSummaryManager.java
+++ b/src/java/org/apache/cassandra/io/sstable/IndexSummaryManager.java
@@@ -260,6 -259,17 +260,17 @@@ public class IndexSummaryManager implem
for (SSTableReader sstable : Iterables.concat(compacting, nonCompacting))
total += sstable.getIndexSummaryOffHeapSize();
+ List<SSTableReader> oldFormatSSTables = new ArrayList<>();
+ for (SSTableReader sstable : nonCompacting)
+ {
+ // We can't change the sampling level of sstables with the old format, because the serialization format
+ // doesn't include the sampling level. Leave this one as it is. (See CASSANDRA-8993 for details.)
+ logger.trace("SSTable {} cannot be re-sampled due to old sstable format", sstable);
- if (!sstable.descriptor.version.hasSamplingLevel)
++ if (!sstable.descriptor.version.hasSamplingLevel())
+ oldFormatSSTables.add(sstable);
+ }
+ nonCompacting.removeAll(oldFormatSSTables);
+
logger.debug("Beginning redistribution of index summaries for {} sstables with memory pool size {} MB; current spaced used is {} MB",
nonCompacting.size(), memoryPoolBytes / 1024L / 1024L, total / 1024.0 / 1024.0);
[2/3] cassandra git commit: Merge branch 'cassandra-2.1' into trunk
Posted by ty...@apache.org.
http://git-wip-us.apache.org/repos/asf/cassandra/blob/8e115dac/src/java/org/apache/cassandra/io/sstable/format/SSTableReader.java
----------------------------------------------------------------------
diff --cc src/java/org/apache/cassandra/io/sstable/format/SSTableReader.java
index e59ca44,0000000..a27adf6
mode 100644,000000..100644
--- a/src/java/org/apache/cassandra/io/sstable/format/SSTableReader.java
+++ b/src/java/org/apache/cassandra/io/sstable/format/SSTableReader.java
@@@ -1,2031 -1,0 +1,2112 @@@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.cassandra.io.sstable.format;
+
+import java.io.*;
+import java.nio.ByteBuffer;
+import java.util.*;
+import java.util.concurrent.*;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicLong;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Predicate;
+import com.google.common.collect.Iterators;
+import com.google.common.collect.Ordering;
+import com.google.common.primitives.Longs;
+import com.google.common.util.concurrent.RateLimiter;
+
+import com.clearspring.analytics.stream.cardinality.CardinalityMergeException;
+import com.clearspring.analytics.stream.cardinality.HyperLogLogPlus;
+import com.clearspring.analytics.stream.cardinality.ICardinality;
+import org.apache.cassandra.cache.CachingOptions;
+import org.apache.cassandra.cache.InstrumentingCache;
+import org.apache.cassandra.cache.KeyCacheKey;
+import org.apache.cassandra.concurrent.DebuggableThreadPoolExecutor;
+import org.apache.cassandra.concurrent.ScheduledExecutors;
+import org.apache.cassandra.config.*;
+import org.apache.cassandra.db.*;
+import org.apache.cassandra.db.columniterator.OnDiskAtomIterator;
+import org.apache.cassandra.db.commitlog.ReplayPosition;
+import org.apache.cassandra.db.composites.CellName;
+import org.apache.cassandra.db.filter.ColumnSlice;
+import org.apache.cassandra.db.index.SecondaryIndex;
+import org.apache.cassandra.dht.*;
+import org.apache.cassandra.io.compress.CompressionMetadata;
+import org.apache.cassandra.io.sstable.*;
+import org.apache.cassandra.io.sstable.metadata.*;
+import org.apache.cassandra.io.util.*;
+import org.apache.cassandra.metrics.RestorableMeter;
+import org.apache.cassandra.metrics.StorageMetrics;
+import org.apache.cassandra.service.ActiveRepairService;
+import org.apache.cassandra.service.CacheService;
+import org.apache.cassandra.service.StorageService;
+import org.apache.cassandra.utils.*;
+import org.apache.cassandra.utils.concurrent.OpOrder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.apache.cassandra.utils.concurrent.Ref;
+import org.apache.cassandra.utils.concurrent.RefCounted;
+import org.apache.cassandra.utils.concurrent.SelfRefCounted;
+
+import static org.apache.cassandra.db.Directories.SECONDARY_INDEX_NAME_SEPARATOR;
+
+/**
+ * An SSTableReader can be constructed in a number of places, but typically is either
+ * read from disk at startup, or constructed from a flushed memtable, or after compaction
+ * to replace some existing sstables. However once created, an sstablereader may also be modified.
+ *
+ * A reader's OpenReason describes its current stage in its lifecycle, as follows:
+ *
+ * NORMAL
+ * From: None => Reader has been read from disk, either at startup or from a flushed memtable
+ * EARLY => Reader is the final result of a compaction
+ * MOVED_START => Reader WAS being compacted, but this failed and it has been restored to NORMAL status
+ *
+ * EARLY
+ * From: None => Reader is a compaction replacement that is either incomplete and has been opened
+ * to represent its partial result status, or has been finished but the compaction
+ * it is a part of has not yet completed fully
+ * EARLY => Same as from None, only it is not the first time it has been
+ *
+ * MOVED_START
+ * From: NORMAL => Reader is being compacted. This compaction has not finished, but the compaction result
+ * is either partially or fully opened, to either partially or fully replace this reader.
+ * This reader's start key has been updated to represent this, so that reads only hit
+ * one or the other reader.
+ *
+ * METADATA_CHANGE
+ * From: NORMAL => Reader has seen low traffic and the amount of memory available for index summaries is
+ * constrained, so its index summary has been downsampled.
+ * METADATA_CHANGE => Same
+ *
+ * Note that in parallel to this, there are two different Descriptor types; TMPLINK and FINAL; the latter corresponds
+ * to NORMAL state readers and all readers that replace a NORMAL one. TMPLINK is used for EARLY state readers and
+ * no others.
+ *
+ * When a reader is being compacted, if the result is large its replacement may be opened as EARLY before compaction
+ * completes in order to present the result to consumers earlier. In this case the reader will itself be changed to
+ * a MOVED_START state, where its start no longer represents its on-disk minimum key. This is to permit reads to be
+ * directed to only one reader when the two represent the same data. The EARLY file can represent a compaction result
+ * that is either partially complete and still in-progress, or a complete and immutable sstable that is part of a larger
+ * macro compaction action that has not yet fully completed.
+ *
+ * Currently ALL compaction results at least briefly go through an EARLY open state prior to completion, regardless
+ * of if early opening is enabled.
+ *
+ * Since a reader can be created multiple times over the same shared underlying resources, and the exact resources
+ * it shares between each instance differ subtly, we track the lifetime of any underlying resource with its own
+ * reference count, which each instance takes a Ref to. Each instance then tracks references to itself, and once these
+ * all expire it releases its Refs to these underlying resources.
+ *
+ * There is some shared cleanup behaviour needed only once all sstablereaders in a certain stage of their lifecycle
+ * (i.e. EARLY or NORMAL opening), and some that must only occur once all readers of any kind over a single logical
+ * sstable have expired. These are managed by the TypeTidy and GlobalTidy classes at the bottom, and are effectively
+ * managed as another resource each instance tracks its own Ref instance to, to ensure all of these resources are
+ * cleaned up safely and can be debugged otherwise.
+ *
+ * TODO: fill in details about DataTracker and lifecycle interactions for tools, and for compaction strategies
+ */
+public abstract class SSTableReader extends SSTable implements SelfRefCounted<SSTableReader>
+{
+ private static final Logger logger = LoggerFactory.getLogger(SSTableReader.class);
+
+ private static final ScheduledThreadPoolExecutor syncExecutor = new ScheduledThreadPoolExecutor(1);
+ private static final RateLimiter meterSyncThrottle = RateLimiter.create(100.0);
+
+ public static final Comparator<SSTableReader> maxTimestampComparator = new Comparator<SSTableReader>()
+ {
+ public int compare(SSTableReader o1, SSTableReader o2)
+ {
+ long ts1 = o1.getMaxTimestamp();
+ long ts2 = o2.getMaxTimestamp();
+ return (ts1 > ts2 ? -1 : (ts1 == ts2 ? 0 : 1));
+ }
+ };
+
+ public static final Comparator<SSTableReader> sstableComparator = new Comparator<SSTableReader>()
+ {
+ public int compare(SSTableReader o1, SSTableReader o2)
+ {
+ return o1.first.compareTo(o2.first);
+ }
+ };
+
+ public static final Ordering<SSTableReader> sstableOrdering = Ordering.from(sstableComparator);
+
+ /**
+ * maxDataAge is a timestamp in local server time (e.g. System.currentTimeMilli) which represents an upper bound
+ * to the newest piece of data stored in the sstable. In other words, this sstable does not contain items created
+ * later than maxDataAge.
+ *
+ * The field is not serialized to disk, so relying on it for more than what truncate does is not advised.
+ *
+ * When a new sstable is flushed, maxDataAge is set to the time of creation.
+ * When a sstable is created from compaction, maxDataAge is set to max of all merged sstables.
+ *
+ * The age is in milliseconds since epoc and is local to this host.
+ */
+ public final long maxDataAge;
+
+ public enum OpenReason
+ {
+ NORMAL,
+ EARLY,
+ METADATA_CHANGE,
+ MOVED_START,
+ SHADOWED // => MOVED_START past end
+ }
+
+ public final OpenReason openReason;
+
+ // indexfile and datafile: might be null before a call to load()
+ protected SegmentedFile ifile;
+ protected SegmentedFile dfile;
+ protected IndexSummary indexSummary;
+ protected IFilter bf;
+
+ protected final RowIndexEntry.IndexSerializer rowIndexEntrySerializer;
+
+ protected InstrumentingCache<KeyCacheKey, RowIndexEntry> keyCache;
+
+ protected final BloomFilterTracker bloomFilterTracker = new BloomFilterTracker();
+
+ // technically isCompacted is not necessary since it should never be unreferenced unless it is also compacted,
+ // but it seems like a good extra layer of protection against reference counting bugs to not delete data based on that alone
+ protected final AtomicBoolean isSuspect = new AtomicBoolean(false);
+
+ // not final since we need to be able to change level on a file.
+ protected volatile StatsMetadata sstableMetadata;
+
+ protected final AtomicLong keyCacheHit = new AtomicLong(0);
+ protected final AtomicLong keyCacheRequest = new AtomicLong(0);
+
+ private final InstanceTidier tidy = new InstanceTidier(descriptor, metadata);
+ private final Ref<SSTableReader> selfRef = new Ref<>(this, tidy);
+
+ private RestorableMeter readMeter;
+
+ /**
+ * Calculate approximate key count.
+ * If cardinality estimator is available on all given sstables, then this method use them to estimate
+ * key count.
+ * If not, then this uses index summaries.
+ *
+ * @param sstables SSTables to calculate key count
+ * @return estimated key count
+ */
+ public static long getApproximateKeyCount(Collection<SSTableReader> sstables)
+ {
+ long count = -1;
+
+ // check if cardinality estimator is available for all SSTables
+ boolean cardinalityAvailable = !sstables.isEmpty() && Iterators.all(sstables.iterator(), new Predicate<SSTableReader>()
+ {
+ public boolean apply(SSTableReader sstable)
+ {
+ return sstable.descriptor.version.hasNewStatsFile();
+ }
+ });
+
+ // if it is, load them to estimate key count
+ if (cardinalityAvailable)
+ {
+ boolean failed = false;
+ ICardinality cardinality = null;
+ for (SSTableReader sstable : sstables)
+ {
+ try
+ {
+ CompactionMetadata metadata = (CompactionMetadata) sstable.descriptor.getMetadataSerializer().deserialize(sstable.descriptor, MetadataType.COMPACTION);
+ assert metadata != null : sstable.getFilename();
+ if (cardinality == null)
+ cardinality = metadata.cardinalityEstimator;
+ else
+ cardinality = cardinality.merge(metadata.cardinalityEstimator);
+ }
+ catch (IOException e)
+ {
+ logger.warn("Reading cardinality from Statistics.db failed.", e);
+ failed = true;
+ break;
+ }
+ catch (CardinalityMergeException e)
+ {
+ logger.warn("Cardinality merge failed.", e);
+ failed = true;
+ break;
+ }
+ }
+ if (cardinality != null && !failed)
+ count = cardinality.cardinality();
+ }
+
+ // if something went wrong above or cardinality is not available, calculate using index summary
+ if (count < 0)
+ {
+ for (SSTableReader sstable : sstables)
+ count += sstable.estimatedKeys();
+ }
+ return count;
+ }
+
+ /**
+ * Estimates how much of the keys we would keep if the sstables were compacted together
+ */
+ public static double estimateCompactionGain(Set<SSTableReader> overlapping)
+ {
+ Set<ICardinality> cardinalities = new HashSet<>(overlapping.size());
+ for (SSTableReader sstable : overlapping)
+ {
+ try
+ {
+ ICardinality cardinality = ((CompactionMetadata) sstable.descriptor.getMetadataSerializer().deserialize(sstable.descriptor, MetadataType.COMPACTION)).cardinalityEstimator;
+ if (cardinality != null)
+ cardinalities.add(cardinality);
+ else
+ logger.debug("Got a null cardinality estimator in: {}", sstable.getFilename());
+ }
+ catch (IOException e)
+ {
+ logger.warn("Could not read up compaction metadata for {}", sstable, e);
+ }
+ }
+ long totalKeyCountBefore = 0;
+ for (ICardinality cardinality : cardinalities)
+ {
+ totalKeyCountBefore += cardinality.cardinality();
+ }
+ if (totalKeyCountBefore == 0)
+ return 1;
+
+ long totalKeyCountAfter = mergeCardinalities(cardinalities).cardinality();
+ logger.debug("Estimated compaction gain: {}/{}={}", totalKeyCountAfter, totalKeyCountBefore, ((double)totalKeyCountAfter)/totalKeyCountBefore);
+ return ((double)totalKeyCountAfter)/totalKeyCountBefore;
+ }
+
+ private static ICardinality mergeCardinalities(Collection<ICardinality> cardinalities)
+ {
+ ICardinality base = new HyperLogLogPlus(13, 25); // see MetadataCollector.cardinality
+ try
+ {
+ base = base.merge(cardinalities.toArray(new ICardinality[cardinalities.size()]));
+ }
+ catch (CardinalityMergeException e)
+ {
+ logger.warn("Could not merge cardinalities", e);
+ }
+ return base;
+ }
+
+ public static SSTableReader open(Descriptor descriptor) throws IOException
+ {
+ CFMetaData metadata;
+ if (descriptor.cfname.contains(SECONDARY_INDEX_NAME_SEPARATOR))
+ {
+ int i = descriptor.cfname.indexOf(SECONDARY_INDEX_NAME_SEPARATOR);
+ String parentName = descriptor.cfname.substring(0, i);
+ CFMetaData parent = Schema.instance.getCFMetaData(descriptor.ksname, parentName);
+ ColumnDefinition def = parent.getColumnDefinitionForIndex(descriptor.cfname.substring(i + 1));
+ metadata = CFMetaData.newIndexMetadata(parent, def, SecondaryIndex.getIndexComparator(parent, def));
+ }
+ else
+ {
+ metadata = Schema.instance.getCFMetaData(descriptor.ksname, descriptor.cfname);
+ }
+ return open(descriptor, metadata);
+ }
+
+ public static SSTableReader open(Descriptor desc, CFMetaData metadata) throws IOException
+ {
+ IPartitioner p = desc.cfname.contains(SECONDARY_INDEX_NAME_SEPARATOR)
+ ? new LocalPartitioner(metadata.getKeyValidator())
+ : StorageService.getPartitioner();
+ return open(desc, componentsFor(desc), metadata, p);
+ }
+
+ public static SSTableReader open(Descriptor descriptor, Set<Component> components, CFMetaData metadata, IPartitioner partitioner) throws IOException
+ {
+ return open(descriptor, components, metadata, partitioner, true);
+ }
+
+ public static SSTableReader openNoValidation(Descriptor descriptor, Set<Component> components, ColumnFamilyStore cfs) throws IOException
+ {
+ return open(descriptor, components, cfs.metadata, cfs.partitioner, false);
+ }
+
+ /**
+ * Open SSTable reader to be used in batch mode(such as sstableloader).
+ *
+ * @param descriptor
+ * @param components
+ * @param metadata
+ * @param partitioner
+ * @return opened SSTableReader
+ * @throws IOException
+ */
+ public static SSTableReader openForBatch(Descriptor descriptor, Set<Component> components, CFMetaData metadata, IPartitioner partitioner) throws IOException
+ {
+ // Minimum components without which we can't do anything
+ assert components.contains(Component.DATA) : "Data component is missing for sstable" + descriptor;
+ assert components.contains(Component.PRIMARY_INDEX) : "Primary index component is missing for sstable " + descriptor;
+
+ Map<MetadataType, MetadataComponent> sstableMetadata = descriptor.getMetadataSerializer().deserialize(descriptor,
+ EnumSet.of(MetadataType.VALIDATION, MetadataType.STATS));
+ ValidationMetadata validationMetadata = (ValidationMetadata) sstableMetadata.get(MetadataType.VALIDATION);
+ StatsMetadata statsMetadata = (StatsMetadata) sstableMetadata.get(MetadataType.STATS);
+
+ // Check if sstable is created using same partitioner.
+ // Partitioner can be null, which indicates older version of sstable or no stats available.
+ // In that case, we skip the check.
+ String partitionerName = partitioner.getClass().getCanonicalName();
+ if (validationMetadata != null && !partitionerName.equals(validationMetadata.partitioner))
+ {
+ logger.error(String.format("Cannot open %s; partitioner %s does not match system partitioner %s. Note that the default partitioner starting with Cassandra 1.2 is Murmur3Partitioner, so you will need to edit that to match your old partitioner if upgrading.",
+ descriptor, validationMetadata.partitioner, partitionerName));
+ System.exit(1);
+ }
+
+ logger.info("Opening {} ({} bytes)", descriptor, new File(descriptor.filenameFor(Component.DATA)).length());
+ SSTableReader sstable = internalOpen(descriptor, components, metadata, partitioner, System.currentTimeMillis(),
+ statsMetadata, OpenReason.NORMAL);
+
+ // special implementation of load to use non-pooled SegmentedFile builders
+ SegmentedFile.Builder ibuilder = new BufferedSegmentedFile.Builder();
+ SegmentedFile.Builder dbuilder = sstable.compression
+ ? new CompressedSegmentedFile.Builder(null)
+ : new BufferedSegmentedFile.Builder();
+ if (!sstable.loadSummary(ibuilder, dbuilder))
+ sstable.buildSummary(false, ibuilder, dbuilder, false, Downsampling.BASE_SAMPLING_LEVEL);
+ sstable.ifile = ibuilder.complete(sstable.descriptor.filenameFor(Component.PRIMARY_INDEX));
+ sstable.dfile = dbuilder.complete(sstable.descriptor.filenameFor(Component.DATA));
+ sstable.bf = FilterFactory.AlwaysPresent;
+ sstable.setup();
+ return sstable;
+ }
+
+ private static SSTableReader open(Descriptor descriptor,
+ Set<Component> components,
+ CFMetaData metadata,
+ IPartitioner partitioner,
+ boolean validate) throws IOException
+ {
+ // Minimum components without which we can't do anything
+ assert components.contains(Component.DATA) : "Data component is missing for sstable" + descriptor;
+ assert components.contains(Component.PRIMARY_INDEX) : "Primary index component is missing for sstable " + descriptor;
+
+ Map<MetadataType, MetadataComponent> sstableMetadata = descriptor.getMetadataSerializer().deserialize(descriptor,
+ EnumSet.of(MetadataType.VALIDATION, MetadataType.STATS));
+ ValidationMetadata validationMetadata = (ValidationMetadata) sstableMetadata.get(MetadataType.VALIDATION);
+ StatsMetadata statsMetadata = (StatsMetadata) sstableMetadata.get(MetadataType.STATS);
+
+ // Check if sstable is created using same partitioner.
+ // Partitioner can be null, which indicates older version of sstable or no stats available.
+ // In that case, we skip the check.
+ String partitionerName = partitioner.getClass().getCanonicalName();
+ if (validationMetadata != null && !partitionerName.equals(validationMetadata.partitioner))
+ {
+ logger.error(String.format("Cannot open %s; partitioner %s does not match system partitioner %s. Note that the default partitioner starting with Cassandra 1.2 is Murmur3Partitioner, so you will need to edit that to match your old partitioner if upgrading.",
+ descriptor, validationMetadata.partitioner, partitionerName));
+ System.exit(1);
+ }
+
+ logger.info("Opening {} ({} bytes)", descriptor, new File(descriptor.filenameFor(Component.DATA)).length());
+ SSTableReader sstable = internalOpen(descriptor, components, metadata, partitioner, System.currentTimeMillis(),
+ statsMetadata, OpenReason.NORMAL);
+
+ // load index and filter
+ long start = System.nanoTime();
+ sstable.load(validationMetadata);
+ logger.debug("INDEX LOAD TIME for {}: {} ms.", descriptor, TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - start));
+
+ sstable.setup();
+ if (validate)
+ sstable.validate();
+
+ if (sstable.getKeyCache() != null)
+ logger.debug("key cache contains {}/{} keys", sstable.getKeyCache().size(), sstable.getKeyCache().getCapacity());
+
+ return sstable;
+ }
+
+ public static void logOpenException(Descriptor descriptor, IOException e)
+ {
+ if (e instanceof FileNotFoundException)
+ logger.error("Missing sstable component in {}; skipped because of {}", descriptor, e.getMessage());
+ else
+ logger.error("Corrupt sstable {}; skipped", descriptor, e);
+ }
+
+ public static Collection<SSTableReader> openAll(Set<Map.Entry<Descriptor, Set<Component>>> entries,
+ final CFMetaData metadata,
+ final IPartitioner partitioner)
+ {
+ final Collection<SSTableReader> sstables = new LinkedBlockingQueue<>();
+
+ ExecutorService executor = DebuggableThreadPoolExecutor.createWithFixedPoolSize("SSTableBatchOpen", FBUtilities.getAvailableProcessors());
+ for (final Map.Entry<Descriptor, Set<Component>> entry : entries)
+ {
+ Runnable runnable = new Runnable()
+ {
+ public void run()
+ {
+ SSTableReader sstable;
+ try
+ {
+ sstable = open(entry.getKey(), entry.getValue(), metadata, partitioner);
+ }
+ catch (IOException ex)
+ {
+ logger.error("Corrupt sstable {}; skipped", entry, ex);
+ return;
+ }
+ sstables.add(sstable);
+ }
+ };
+ executor.submit(runnable);
+ }
+
+ executor.shutdown();
+ try
+ {
+ executor.awaitTermination(7, TimeUnit.DAYS);
+ }
+ catch (InterruptedException e)
+ {
+ throw new AssertionError(e);
+ }
+
+ return sstables;
+
+ }
+
+ /**
+ * Open a RowIndexedReader which already has its state initialized (by SSTableWriter).
+ */
+ public static SSTableReader internalOpen(Descriptor desc,
+ Set<Component> components,
+ CFMetaData metadata,
+ IPartitioner partitioner,
+ SegmentedFile ifile,
+ SegmentedFile dfile,
+ IndexSummary isummary,
+ IFilter bf,
+ long maxDataAge,
+ StatsMetadata sstableMetadata,
+ OpenReason openReason)
+ {
+ assert desc != null && partitioner != null && ifile != null && dfile != null && isummary != null && bf != null && sstableMetadata != null;
+
+ SSTableReader reader = internalOpen(desc, components, metadata, partitioner, maxDataAge, sstableMetadata, openReason);
+
+ reader.bf = bf;
+ reader.ifile = ifile;
+ reader.dfile = dfile;
+ reader.indexSummary = isummary;
+ reader.setup();
+
+ return reader;
+ }
+
+
+ private static SSTableReader internalOpen(final Descriptor descriptor,
+ Set<Component> components,
+ CFMetaData metadata,
+ IPartitioner partitioner,
+ Long maxDataAge,
+ StatsMetadata sstableMetadata,
+ OpenReason openReason)
+ {
+ Factory readerFactory = descriptor.getFormat().getReaderFactory();
+
+ return readerFactory.open(descriptor, components, metadata, partitioner, maxDataAge, sstableMetadata, openReason);
+ }
+
+ protected SSTableReader(final Descriptor desc,
+ Set<Component> components,
+ CFMetaData metadata,
+ IPartitioner partitioner,
+ long maxDataAge,
+ StatsMetadata sstableMetadata,
+ OpenReason openReason)
+ {
+ super(desc, components, metadata, partitioner);
+ this.sstableMetadata = sstableMetadata;
+ this.maxDataAge = maxDataAge;
+ this.openReason = openReason;
+ this.rowIndexEntrySerializer = descriptor.version.getSSTableFormat().getIndexSerializer(metadata);
+ }
+
+ public static long getTotalBytes(Iterable<SSTableReader> sstables)
+ {
+ long sum = 0;
+ for (SSTableReader sstable : sstables)
+ {
+ sum += sstable.onDiskLength();
+ }
+ return sum;
+ }
+
+ public boolean equals(Object that)
+ {
+ return that instanceof SSTableReader && ((SSTableReader) that).descriptor.equals(this.descriptor);
+ }
+
+ public int hashCode()
+ {
+ return this.descriptor.hashCode();
+ }
+
+ public String getFilename()
+ {
+ return dfile.path;
+ }
+
+ public String getIndexFilename()
+ {
+ return ifile.path;
+ }
+
+ public void setTrackedBy(DataTracker tracker)
+ {
+ tidy.type.deletingTask.setTracker(tracker);
+ // under normal operation we can do this at any time, but SSTR is also used outside C* proper,
+ // e.g. by BulkLoader, which does not initialize the cache. As a kludge, we set up the cache
+ // here when we know we're being wired into the rest of the server infrastructure.
+ keyCache = CacheService.instance.keyCache;
+ }
+
+ private void load(ValidationMetadata validation) throws IOException
+ {
+ if (metadata.getBloomFilterFpChance() == 1.0)
+ {
+ // bf is disabled.
+ load(false, true);
+ bf = FilterFactory.AlwaysPresent;
+ }
+ else if (!components.contains(Component.FILTER) || validation == null)
+ {
+ // bf is enabled, but filter component is missing.
+ load(true, true);
+ }
+ else if (validation.bloomFilterFPChance != metadata.getBloomFilterFpChance())
+ {
+ // bf fp chance in sstable metadata and it has changed since compaction.
+ load(true, true);
+ }
+ else
+ {
+ // bf is enabled and fp chance matches the currently configured value.
+ load(false, true);
+ loadBloomFilter();
+ }
+ }
+
+ /**
+ * Load bloom filter from Filter.db file.
+ *
+ * @throws IOException
+ */
+ private void loadBloomFilter() throws IOException
+ {
+ DataInputStream stream = null;
+ try
+ {
+ stream = new DataInputStream(new BufferedInputStream(new FileInputStream(descriptor.filenameFor(Component.FILTER))));
+ bf = FilterFactory.deserialize(stream, true);
+ }
+ finally
+ {
+ FileUtils.closeQuietly(stream);
+ }
+ }
+
+ /**
+ * Loads ifile, dfile and indexSummary, and optionally recreates the bloom filter.
+ * @param saveSummaryIfCreated for bulk loading purposes, if the summary was absent and needed to be built, you can
+ * avoid persisting it to disk by setting this to false
+ */
+ private void load(boolean recreateBloomFilter, boolean saveSummaryIfCreated) throws IOException
+ {
+ SegmentedFile.Builder ibuilder = SegmentedFile.getBuilder(DatabaseDescriptor.getIndexAccessMode());
+ SegmentedFile.Builder dbuilder = compression
+ ? SegmentedFile.getCompressedBuilder()
+ : SegmentedFile.getBuilder(DatabaseDescriptor.getDiskAccessMode());
+
+ boolean summaryLoaded = loadSummary(ibuilder, dbuilder);
++ boolean builtSummary = false;
+ if (recreateBloomFilter || !summaryLoaded)
++ {
+ buildSummary(recreateBloomFilter, ibuilder, dbuilder, summaryLoaded, Downsampling.BASE_SAMPLING_LEVEL);
++ builtSummary = true;
++ }
+
+ ifile = ibuilder.complete(descriptor.filenameFor(Component.PRIMARY_INDEX));
+ dfile = dbuilder.complete(descriptor.filenameFor(Component.DATA));
- if (saveSummaryIfCreated && (recreateBloomFilter || !summaryLoaded)) // save summary information to disk
++
++ // Check for an index summary that was downsampled even though the serialization format doesn't support
++ // that. If it was downsampled, rebuild it. See CASSANDRA-8993 for details.
++ if (!descriptor.version.hasSamplingLevel() && !builtSummary && !validateSummarySamplingLevel())
++ {
++ indexSummary.close();
++ ifile.close();
++ dfile.close();
++
++ logger.info("Detected erroneously downsampled index summary; will rebuild summary at full sampling");
++ FileUtils.deleteWithConfirm(new File(descriptor.filenameFor(Component.SUMMARY)));
++ ibuilder = SegmentedFile.getBuilder(DatabaseDescriptor.getIndexAccessMode());
++ dbuilder = compression
++ ? SegmentedFile.getCompressedBuilder()
++ : SegmentedFile.getBuilder(DatabaseDescriptor.getDiskAccessMode());
++ buildSummary(false, ibuilder, dbuilder, false, Downsampling.BASE_SAMPLING_LEVEL);
++ ifile = ibuilder.complete(descriptor.filenameFor(Component.PRIMARY_INDEX));
++ dfile = dbuilder.complete(descriptor.filenameFor(Component.DATA));
+ saveSummary(ibuilder, dbuilder);
++ }
++ else if (saveSummaryIfCreated && builtSummary)
++ {
++ saveSummary(ibuilder, dbuilder);
++ }
+ }
+
+ /**
+ * Build index summary(and optionally bloom filter) by reading through Index.db file.
+ *
+ * @param recreateBloomFilter true if recreate bloom filter
+ * @param ibuilder
+ * @param dbuilder
+ * @param summaryLoaded true if index summary is already loaded and not need to build again
+ * @throws IOException
+ */
+ private void buildSummary(boolean recreateBloomFilter, SegmentedFile.Builder ibuilder, SegmentedFile.Builder dbuilder, boolean summaryLoaded, int samplingLevel) throws IOException
+ {
+ // we read the positions in a BRAF so we don't have to worry about an entry spanning a mmap boundary.
+ RandomAccessReader primaryIndex = RandomAccessReader.open(new File(descriptor.filenameFor(Component.PRIMARY_INDEX)));
+
+ try
+ {
+ long indexSize = primaryIndex.length();
+ long histogramCount = sstableMetadata.estimatedRowSize.count();
+ long estimatedKeys = histogramCount > 0 && !sstableMetadata.estimatedRowSize.isOverflowed()
+ ? histogramCount
+ : estimateRowsFromIndex(primaryIndex); // statistics is supposed to be optional
+
+ if (recreateBloomFilter)
+ bf = FilterFactory.getFilter(estimatedKeys, metadata.getBloomFilterFpChance(), true);
+
+ try (IndexSummaryBuilder summaryBuilder = summaryLoaded ? null : new IndexSummaryBuilder(estimatedKeys, metadata.getMinIndexInterval(), samplingLevel))
+ {
+ long indexPosition;
+ RowIndexEntry.IndexSerializer rowIndexSerializer = descriptor.getFormat().getIndexSerializer(metadata);
+
+ while ((indexPosition = primaryIndex.getFilePointer()) != indexSize)
+ {
+ ByteBuffer key = ByteBufferUtil.readWithShortLength(primaryIndex);
+ RowIndexEntry indexEntry = rowIndexSerializer.deserialize(primaryIndex, descriptor.version);
+ DecoratedKey decoratedKey = partitioner.decorateKey(key);
+ if (first == null)
+ first = decoratedKey;
+ last = decoratedKey;
+
+ if (recreateBloomFilter)
+ bf.add(decoratedKey);
+
+ // if summary was already read from disk we don't want to re-populate it using primary index
+ if (!summaryLoaded)
+ {
+ summaryBuilder.maybeAddEntry(decoratedKey, indexPosition);
+ ibuilder.addPotentialBoundary(indexPosition);
+ dbuilder.addPotentialBoundary(indexEntry.position);
+ }
+ }
+
+ if (!summaryLoaded)
+ indexSummary = summaryBuilder.build(partitioner);
+ }
+ }
+ finally
+ {
+ FileUtils.closeQuietly(primaryIndex);
+ }
+
+ first = getMinimalKey(first);
+ last = getMinimalKey(last);
+ }
+
+ /**
+ * Load index summary from Summary.db file if it exists.
+ *
+ * if loaded index summary has different index interval from current value stored in schema,
+ * then Summary.db file will be deleted and this returns false to rebuild summary.
+ *
+ * @param ibuilder
+ * @param dbuilder
+ * @return true if index summary is loaded successfully from Summary.db file.
+ */
+ public boolean loadSummary(SegmentedFile.Builder ibuilder, SegmentedFile.Builder dbuilder)
+ {
+ File summariesFile = new File(descriptor.filenameFor(Component.SUMMARY));
+ if (!summariesFile.exists())
+ return false;
+
+ DataInputStream iStream = null;
+ try
+ {
+ iStream = new DataInputStream(new FileInputStream(summariesFile));
- indexSummary = IndexSummary.serializer.deserialize(iStream, partitioner, descriptor.version.hasSamplingLevel(), metadata.getMinIndexInterval(), metadata.getMaxIndexInterval());
++ indexSummary = IndexSummary.serializer.deserialize(
++ iStream, partitioner, descriptor.version.hasSamplingLevel(),
++ metadata.getMinIndexInterval(), metadata.getMaxIndexInterval());
+ first = partitioner.decorateKey(ByteBufferUtil.readWithLength(iStream));
+ last = partitioner.decorateKey(ByteBufferUtil.readWithLength(iStream));
+ ibuilder.deserializeBounds(iStream);
+ dbuilder.deserializeBounds(iStream);
+ }
+ catch (IOException e)
+ {
+ if (indexSummary != null)
+ indexSummary.close();
+ logger.debug("Cannot deserialize SSTable Summary File {}: {}", summariesFile.getPath(), e.getMessage());
+ // corrupted; delete it and fall back to creating a new summary
+ FileUtils.closeQuietly(iStream);
+ // delete it and fall back to creating a new summary
+ FileUtils.deleteWithConfirm(summariesFile);
+ return false;
+ }
+ finally
+ {
+ FileUtils.closeQuietly(iStream);
+ }
+
+ return true;
+ }
+
+ /**
++ * Validates that an index summary has full sampling, as expected when the serialization format does not support
++ * persisting the sampling level.
++ * @return true if the summary has full sampling, false otherwise
++ */
++ private boolean validateSummarySamplingLevel()
++ {
++ // We need to check index summary entries against the index to verify that none of them were dropped due to
++ // downsampling. Downsampling can drop any of the first BASE_SAMPLING_LEVEL entries (repeating that drop pattern
++ // for the remainder of the summary). Unfortunately, the first entry to be dropped is the entry at
++ // index (BASE_SAMPLING_LEVEL - 1), so we need to check a full set of BASE_SAMPLING_LEVEL entries.
++ Iterator<FileDataInput> segments = ifile.iterator(0);
++ int i = 0;
++ int summaryEntriesChecked = 0;
++ int expectedIndexInterval = getMinIndexInterval();
++ while (segments.hasNext())
++ {
++ FileDataInput in = segments.next();
++ try
++ {
++ while (!in.isEOF())
++ {
++ ByteBuffer indexKey = ByteBufferUtil.readWithShortLength(in);
++ if (i % expectedIndexInterval == 0)
++ {
++ ByteBuffer summaryKey = ByteBuffer.wrap(indexSummary.getKey(i / expectedIndexInterval));
++ if (!summaryKey.equals(indexKey))
++ return false;
++ summaryEntriesChecked++;
++
++ if (summaryEntriesChecked == Downsampling.BASE_SAMPLING_LEVEL)
++ return true;
++ }
++ RowIndexEntry.Serializer.skip(in);
++ i++;
++ }
++ }
++ catch (IOException e)
++ {
++ markSuspect();
++ throw new CorruptSSTableException(e, in.getPath());
++ }
++ finally
++ {
++ FileUtils.closeQuietly(in);
++ }
++ }
++
++ return true;
++ }
++
++ /**
+ * Save index summary to Summary.db file.
+ *
+ * @param ibuilder
+ * @param dbuilder
+ */
+ public void saveSummary(SegmentedFile.Builder ibuilder, SegmentedFile.Builder dbuilder)
+ {
+ saveSummary(ibuilder, dbuilder, indexSummary);
+ }
+
+ private void saveSummary(SegmentedFile.Builder ibuilder, SegmentedFile.Builder dbuilder, IndexSummary summary)
+ {
+ File summariesFile = new File(descriptor.filenameFor(Component.SUMMARY));
+ if (summariesFile.exists())
+ FileUtils.deleteWithConfirm(summariesFile);
+
+ DataOutputStreamAndChannel oStream = null;
+ try
+ {
+ oStream = new DataOutputStreamAndChannel(new FileOutputStream(summariesFile));
+ IndexSummary.serializer.serialize(summary, oStream, descriptor.version.hasSamplingLevel());
+ ByteBufferUtil.writeWithLength(first.getKey(), oStream);
+ ByteBufferUtil.writeWithLength(last.getKey(), oStream);
+ ibuilder.serializeBounds(oStream);
+ dbuilder.serializeBounds(oStream);
+ }
+ catch (IOException e)
+ {
+ logger.debug("Cannot save SSTable Summary: ", e);
+
+ // corrupted hence delete it and let it load it now.
+ if (summariesFile.exists())
+ FileUtils.deleteWithConfirm(summariesFile);
+ }
+ finally
+ {
+ FileUtils.closeQuietly(oStream);
+ }
+ }
+
+ public void setReplacedBy(SSTableReader replacement)
+ {
+ synchronized (tidy.global)
+ {
+ assert replacement != null;
+ assert !tidy.isReplaced;
+ assert tidy.global.live == this;
+ tidy.isReplaced = true;
+ tidy.global.live = replacement;
+ }
+ }
+
+ public SSTableReader cloneWithNewStart(DecoratedKey newStart, final Runnable runOnClose)
+ {
+ synchronized (tidy.global)
+ {
+ assert openReason != OpenReason.EARLY;
+ SSTableReader replacement = internalOpen(descriptor, components, metadata, partitioner, ifile.sharedCopy(),
+ dfile.sharedCopy(), indexSummary.sharedCopy(), bf.sharedCopy(),
+ maxDataAge, sstableMetadata, OpenReason.MOVED_START);
+ // TODO: make data/index start accurate for compressed files
+ // TODO: merge with caller's firstKeyBeyond() work,to save time
+ if (newStart.compareTo(first) > 0)
+ {
+ final long dataStart = getPosition(newStart, Operator.EQ).position;
+ final long indexStart = getIndexScanPosition(newStart);
+ this.tidy.runOnClose = new Runnable()
+ {
+ public void run()
+ {
+ dfile.dropPageCache(dataStart);
+ ifile.dropPageCache(indexStart);
+ if (runOnClose != null)
+ runOnClose.run();
+ }
+ };
+ }
+
+ replacement.first = newStart;
+ replacement.last = this.last;
+ setReplacedBy(replacement);
+ return replacement;
+ }
+ }
+
+ public SSTableReader cloneAsShadowed(final Runnable runOnClose)
+ {
+ synchronized (tidy.global)
+ {
+ assert openReason != OpenReason.EARLY;
+ this.tidy.runOnClose = new Runnable()
+ {
+ public void run()
+ {
+ dfile.dropPageCache(0);
+ ifile.dropPageCache(0);
+ runOnClose.run();
+ }
+ };
+
+ SSTableReader replacement = internalOpen(descriptor, components, metadata, partitioner, ifile.sharedCopy(),
+ dfile.sharedCopy(), indexSummary.sharedCopy(), bf.sharedCopy(),
+ maxDataAge, sstableMetadata, OpenReason.SHADOWED);
+ replacement.first = first;
+ replacement.last = last;
+ setReplacedBy(replacement);
+ return replacement;
+ }
+ }
+
+ /**
+ * Returns a new SSTableReader with the same properties as this SSTableReader except that a new IndexSummary will
+ * be built at the target samplingLevel. This (original) SSTableReader instance will be marked as replaced, have
+ * its DeletingTask removed, and have its periodic read-meter sync task cancelled.
+ * @param samplingLevel the desired sampling level for the index summary on the new SSTableReader
+ * @return a new SSTableReader
+ * @throws IOException
+ */
+ public SSTableReader cloneWithNewSummarySamplingLevel(ColumnFamilyStore parent, int samplingLevel) throws IOException
+ {
++ assert descriptor.version.hasSamplingLevel();
++
+ synchronized (tidy.global)
+ {
+ assert openReason != OpenReason.EARLY;
+
+ int minIndexInterval = metadata.getMinIndexInterval();
+ int maxIndexInterval = metadata.getMaxIndexInterval();
+ double effectiveInterval = indexSummary.getEffectiveIndexInterval();
+
+ IndexSummary newSummary;
+ long oldSize = bytesOnDisk();
+
+ // We have to rebuild the summary from the on-disk primary index in three cases:
+ // 1. The sampling level went up, so we need to read more entries off disk
+ // 2. The min_index_interval changed (in either direction); this changes what entries would be in the summary
+ // at full sampling (and consequently at any other sampling level)
+ // 3. The max_index_interval was lowered, forcing us to raise the sampling level
+ if (samplingLevel > indexSummary.getSamplingLevel() || indexSummary.getMinIndexInterval() != minIndexInterval || effectiveInterval > maxIndexInterval)
+ {
+ newSummary = buildSummaryAtLevel(samplingLevel);
+ }
+ else if (samplingLevel < indexSummary.getSamplingLevel())
+ {
+ // we can use the existing index summary to make a smaller one
+ newSummary = IndexSummaryBuilder.downsample(indexSummary, samplingLevel, minIndexInterval, partitioner);
+
+ SegmentedFile.Builder ibuilder = SegmentedFile.getBuilder(DatabaseDescriptor.getIndexAccessMode());
+ SegmentedFile.Builder dbuilder = compression
+ ? SegmentedFile.getCompressedBuilder()
+ : SegmentedFile.getBuilder(DatabaseDescriptor.getDiskAccessMode());
+ saveSummary(ibuilder, dbuilder, newSummary);
+ }
+ else
+ {
+ throw new AssertionError("Attempted to clone SSTableReader with the same index summary sampling level and " +
+ "no adjustments to min/max_index_interval");
+ }
+
+ long newSize = bytesOnDisk();
+ StorageMetrics.load.inc(newSize - oldSize);
+ parent.metric.liveDiskSpaceUsed.inc(newSize - oldSize);
+
+ SSTableReader replacement = internalOpen(descriptor, components, metadata, partitioner, ifile.sharedCopy(),
+ dfile.sharedCopy(), newSummary, bf.sharedCopy(), maxDataAge,
+ sstableMetadata, OpenReason.METADATA_CHANGE);
+ replacement.first = this.first;
+ replacement.last = this.last;
+ setReplacedBy(replacement);
+ return replacement;
+ }
+ }
+
+ private IndexSummary buildSummaryAtLevel(int newSamplingLevel) throws IOException
+ {
+ // we read the positions in a BRAF so we don't have to worry about an entry spanning a mmap boundary.
+ RandomAccessReader primaryIndex = RandomAccessReader.open(new File(descriptor.filenameFor(Component.PRIMARY_INDEX)));
+ try
+ {
+ long indexSize = primaryIndex.length();
+ try (IndexSummaryBuilder summaryBuilder = new IndexSummaryBuilder(estimatedKeys(), metadata.getMinIndexInterval(), newSamplingLevel))
+ {
+ long indexPosition;
+ while ((indexPosition = primaryIndex.getFilePointer()) != indexSize)
+ {
+ summaryBuilder.maybeAddEntry(partitioner.decorateKey(ByteBufferUtil.readWithShortLength(primaryIndex)), indexPosition);
+ RowIndexEntry.Serializer.skip(primaryIndex);
+ }
+
+ return summaryBuilder.build(partitioner);
+ }
+ }
+ finally
+ {
+ FileUtils.closeQuietly(primaryIndex);
+ }
+ }
+
+ public RestorableMeter getReadMeter()
+ {
+ return readMeter;
+ }
+
+ public int getIndexSummarySamplingLevel()
+ {
+ return indexSummary.getSamplingLevel();
+ }
+
+ public long getIndexSummaryOffHeapSize()
+ {
+ return indexSummary.getOffHeapSize();
+ }
+
+ public int getMinIndexInterval()
+ {
+ return indexSummary.getMinIndexInterval();
+ }
+
+ public double getEffectiveIndexInterval()
+ {
+ return indexSummary.getEffectiveIndexInterval();
+ }
+
+ public void releaseSummary()
+ {
+ tidy.releaseSummary();
+ indexSummary = null;
+ }
+
+ private void validate()
+ {
+ if (this.first.compareTo(this.last) > 0)
+ {
+ selfRef().release();
+ throw new IllegalStateException(String.format("SSTable first key %s > last key %s", this.first, this.last));
+ }
+ }
+
+ /**
+ * Gets the position in the index file to start scanning to find the given key (at most indexInterval keys away,
+ * modulo downsampling of the index summary). Always returns a value >= 0
+ */
+ public long getIndexScanPosition(RowPosition key)
+ {
+ if (openReason == OpenReason.MOVED_START && key.compareTo(first) < 0)
+ key = first;
+
+ return getIndexScanPositionFromBinarySearchResult(indexSummary.binarySearch(key), indexSummary);
+ }
+
+ @VisibleForTesting
+ public static long getIndexScanPositionFromBinarySearchResult(int binarySearchResult, IndexSummary referencedIndexSummary)
+ {
+ if (binarySearchResult == -1)
+ return 0;
+ else
+ return referencedIndexSummary.getPosition(getIndexSummaryIndexFromBinarySearchResult(binarySearchResult));
+ }
+
+ public static int getIndexSummaryIndexFromBinarySearchResult(int binarySearchResult)
+ {
+ if (binarySearchResult < 0)
+ {
+ // binary search gives us the first index _greater_ than the key searched for,
+ // i.e., its insertion position
+ int greaterThan = (binarySearchResult + 1) * -1;
+ if (greaterThan == 0)
+ return -1;
+ return greaterThan - 1;
+ }
+ else
+ {
+ return binarySearchResult;
+ }
+ }
+
+ /**
+ * Returns the compression metadata for this sstable.
+ * @throws IllegalStateException if the sstable is not compressed
+ */
+ public CompressionMetadata getCompressionMetadata()
+ {
+ if (!compression)
+ throw new IllegalStateException(this + " is not compressed");
+
+ CompressionMetadata cmd = ((ICompressedFile) dfile).getMetadata();
+
+ //We need the parent cf metadata
+ String cfName = metadata.isSecondaryIndex() ? metadata.getParentColumnFamilyName() : metadata.cfName;
+ cmd.parameters.setLiveMetadata(Schema.instance.getCFMetaData(metadata.ksName, cfName));
+
+ return cmd;
+ }
+
+ /**
+ * Returns the amount of memory in bytes used off heap by the compression meta-data.
+ * @return the amount of memory in bytes used off heap by the compression meta-data
+ */
+ public long getCompressionMetadataOffHeapSize()
+ {
+ if (!compression)
+ return 0;
+
+ return getCompressionMetadata().offHeapSize();
+ }
+
+ /**
+ * For testing purposes only.
+ */
+ public void forceFilterFailures()
+ {
+ bf = FilterFactory.AlwaysPresent;
+ }
+
+ public IFilter getBloomFilter()
+ {
+ return bf;
+ }
+
+ public long getBloomFilterSerializedSize()
+ {
+ return bf.serializedSize();
+ }
+
+ /**
+ * Returns the amount of memory in bytes used off heap by the bloom filter.
+ * @return the amount of memory in bytes used off heap by the bloom filter
+ */
+ public long getBloomFilterOffHeapSize()
+ {
+ return bf.offHeapSize();
+ }
+
+ /**
+ * @return An estimate of the number of keys in this SSTable based on the index summary.
+ */
+ public long estimatedKeys()
+ {
+ return indexSummary.getEstimatedKeyCount();
+ }
+
+ /**
+ * @param ranges
+ * @return An estimate of the number of keys for given ranges in this SSTable.
+ */
+ public long estimatedKeysForRanges(Collection<Range<Token>> ranges)
+ {
+ long sampleKeyCount = 0;
+ List<Pair<Integer, Integer>> sampleIndexes = getSampleIndexesForRanges(indexSummary, ranges);
+ for (Pair<Integer, Integer> sampleIndexRange : sampleIndexes)
+ sampleKeyCount += (sampleIndexRange.right - sampleIndexRange.left + 1);
+
+ // adjust for the current sampling level: (BSL / SL) * index_interval_at_full_sampling
+ long estimatedKeys = sampleKeyCount * ((long) Downsampling.BASE_SAMPLING_LEVEL * indexSummary.getMinIndexInterval()) / indexSummary.getSamplingLevel();
+ return Math.max(1, estimatedKeys);
+ }
+
+ /**
+ * Returns the number of entries in the IndexSummary. At full sampling, this is approximately 1/INDEX_INTERVALth of
+ * the keys in this SSTable.
+ */
+ public int getIndexSummarySize()
+ {
+ return indexSummary.size();
+ }
+
+ /**
+ * Returns the approximate number of entries the IndexSummary would contain if it were at full sampling.
+ */
+ public int getMaxIndexSummarySize()
+ {
+ return indexSummary.getMaxNumberOfEntries();
+ }
+
+ /**
+ * Returns the key for the index summary entry at `index`.
+ */
+ public byte[] getIndexSummaryKey(int index)
+ {
+ return indexSummary.getKey(index);
+ }
+
+ private static List<Pair<Integer,Integer>> getSampleIndexesForRanges(IndexSummary summary, Collection<Range<Token>> ranges)
+ {
+ // use the index to determine a minimal section for each range
+ List<Pair<Integer,Integer>> positions = new ArrayList<>();
+
+ for (Range<Token> range : Range.normalize(ranges))
+ {
+ RowPosition leftPosition = range.left.maxKeyBound();
+ RowPosition rightPosition = range.right.maxKeyBound();
+
+ int left = summary.binarySearch(leftPosition);
+ if (left < 0)
+ left = (left + 1) * -1;
+ else
+ // left range are start exclusive
+ left = left + 1;
+ if (left == summary.size())
+ // left is past the end of the sampling
+ continue;
+
+ int right = Range.isWrapAround(range.left, range.right)
+ ? summary.size() - 1
+ : summary.binarySearch(rightPosition);
+ if (right < 0)
+ {
+ // range are end inclusive so we use the previous index from what binarySearch give us
+ // since that will be the last index we will return
+ right = (right + 1) * -1;
+ if (right == 0)
+ // Means the first key is already stricly greater that the right bound
+ continue;
+ right--;
+ }
+
+ if (left > right)
+ // empty range
+ continue;
+ positions.add(Pair.create(left, right));
+ }
+ return positions;
+ }
+
+ public Iterable<DecoratedKey> getKeySamples(final Range<Token> range)
+ {
+ final List<Pair<Integer, Integer>> indexRanges = getSampleIndexesForRanges(indexSummary, Collections.singletonList(range));
+
+ if (indexRanges.isEmpty())
+ return Collections.emptyList();
+
+ return new Iterable<DecoratedKey>()
+ {
+ public Iterator<DecoratedKey> iterator()
+ {
+ return new Iterator<DecoratedKey>()
+ {
+ private Iterator<Pair<Integer, Integer>> rangeIter = indexRanges.iterator();
+ private Pair<Integer, Integer> current;
+ private int idx;
+
+ public boolean hasNext()
+ {
+ if (current == null || idx > current.right)
+ {
+ if (rangeIter.hasNext())
+ {
+ current = rangeIter.next();
+ idx = current.left;
+ return true;
+ }
+ return false;
+ }
+
+ return true;
+ }
+
+ public DecoratedKey next()
+ {
+ byte[] bytes = indexSummary.getKey(idx++);
+ return partitioner.decorateKey(ByteBuffer.wrap(bytes));
+ }
+
+ public void remove()
+ {
+ throw new UnsupportedOperationException();
+ }
+ };
+ }
+ };
+ }
+
+ /**
+ * Determine the minimal set of sections that can be extracted from this SSTable to cover the given ranges.
+ * @return A sorted list of (offset,end) pairs that cover the given ranges in the datafile for this SSTable.
+ */
+ public List<Pair<Long,Long>> getPositionsForRanges(Collection<Range<Token>> ranges)
+ {
+ // use the index to determine a minimal section for each range
+ List<Pair<Long,Long>> positions = new ArrayList<>();
+ for (Range<Token> range : Range.normalize(ranges))
+ {
+ assert !range.isWrapAround() || range.right.isMinimum();
+ // truncate the range so it at most covers the sstable
+ AbstractBounds<RowPosition> bounds = Range.makeRowRange(range);
+ RowPosition leftBound = bounds.left.compareTo(first) > 0 ? bounds.left : first.getToken().minKeyBound();
+ RowPosition rightBound = bounds.right.isMinimum() ? last.getToken().maxKeyBound() : bounds.right;
+
+ if (leftBound.compareTo(last) > 0 || rightBound.compareTo(first) < 0)
+ continue;
+
+ long left = getPosition(leftBound, Operator.GT).position;
+ long right = (rightBound.compareTo(last) > 0)
+ ? uncompressedLength()
+ : getPosition(rightBound, Operator.GT).position;
+
+ if (left == right)
+ // empty range
+ continue;
+
+ assert left < right : String.format("Range=%s openReason=%s first=%s last=%s left=%d right=%d", range, openReason, first, last, left, right);
+ positions.add(Pair.create(left, right));
+ }
+ return positions;
+ }
+
+ public void invalidateCacheKey(DecoratedKey key)
+ {
+ KeyCacheKey cacheKey = new KeyCacheKey(metadata.cfId, descriptor, key.getKey());
+ keyCache.remove(cacheKey);
+ }
+
+ public void cacheKey(DecoratedKey key, RowIndexEntry info)
+ {
+ CachingOptions caching = metadata.getCaching();
+
+ if (!caching.keyCache.isEnabled()
+ || keyCache == null
+ || keyCache.getCapacity() == 0)
+ {
+ return;
+ }
+
+ KeyCacheKey cacheKey = new KeyCacheKey(metadata.cfId, descriptor, key.getKey());
+ logger.trace("Adding cache entry for {} -> {}", cacheKey, info);
+ keyCache.put(cacheKey, info);
+ }
+
+ public RowIndexEntry getCachedPosition(DecoratedKey key, boolean updateStats)
+ {
+ return getCachedPosition(new KeyCacheKey(metadata.cfId, descriptor, key.getKey()), updateStats);
+ }
+
+ protected RowIndexEntry getCachedPosition(KeyCacheKey unifiedKey, boolean updateStats)
+ {
+ if (keyCache != null && keyCache.getCapacity() > 0) {
+ if (updateStats)
+ {
+ RowIndexEntry cachedEntry = keyCache.get(unifiedKey);
+ keyCacheRequest.incrementAndGet();
+ if (cachedEntry != null)
+ {
+ keyCacheHit.incrementAndGet();
+ bloomFilterTracker.addTruePositive();
+ }
+ return cachedEntry;
+ }
+ else
+ {
+ return keyCache.getInternal(unifiedKey);
+ }
+ }
+ return null;
+ }
+
+ /**
+ * Get position updating key cache and stats.
+ * @see #getPosition(org.apache.cassandra.db.RowPosition, SSTableReader.Operator, boolean)
+ */
+ public RowIndexEntry getPosition(RowPosition key, Operator op)
+ {
+ return getPosition(key, op, true, false);
+ }
+
+ public RowIndexEntry getPosition(RowPosition key, Operator op, boolean updateCacheAndStats)
+ {
+ return getPosition(key, op, updateCacheAndStats, false);
+ }
+ /**
+ * @param key The key to apply as the rhs to the given Operator. A 'fake' key is allowed to
+ * allow key selection by token bounds but only if op != * EQ
+ * @param op The Operator defining matching keys: the nearest key to the target matching the operator wins.
+ * @param updateCacheAndStats true if updating stats and cache
+ * @return The index entry corresponding to the key, or null if the key is not present
+ */
+ protected abstract RowIndexEntry getPosition(RowPosition key, Operator op, boolean updateCacheAndStats, boolean permitMatchPastLast);
+
+ //Corresponds to a name column
+ public abstract OnDiskAtomIterator iterator(DecoratedKey key, SortedSet<CellName> columns);
+ public abstract OnDiskAtomIterator iterator(FileDataInput file, DecoratedKey key, SortedSet<CellName> columns, RowIndexEntry indexEntry);
+
+ //Corresponds to a slice query
+ public abstract OnDiskAtomIterator iterator(DecoratedKey key, ColumnSlice[] slices, boolean reverse);
+ public abstract OnDiskAtomIterator iterator(FileDataInput file, DecoratedKey key, ColumnSlice[] slices, boolean reversed, RowIndexEntry indexEntry);
+
+ /**
+ * Finds and returns the first key beyond a given token in this SSTable or null if no such key exists.
+ */
+ public DecoratedKey firstKeyBeyond(RowPosition token)
+ {
+ if (token.compareTo(first) < 0)
+ return first;
+
+ long sampledPosition = getIndexScanPosition(token);
+
+ Iterator<FileDataInput> segments = ifile.iterator(sampledPosition);
+ while (segments.hasNext())
+ {
+ FileDataInput in = segments.next();
+ try
+ {
+ while (!in.isEOF())
+ {
+ ByteBuffer indexKey = ByteBufferUtil.readWithShortLength(in);
+ DecoratedKey indexDecoratedKey = partitioner.decorateKey(indexKey);
+ if (indexDecoratedKey.compareTo(token) > 0)
+ return indexDecoratedKey;
+
+ RowIndexEntry.Serializer.skip(in);
+ }
+ }
+ catch (IOException e)
+ {
+ markSuspect();
+ throw new CorruptSSTableException(e, in.getPath());
+ }
+ finally
+ {
+ FileUtils.closeQuietly(in);
+ }
+ }
+
+ return null;
+ }
+
+ /**
+ * @return The length in bytes of the data for this SSTable. For
+ * compressed files, this is not the same thing as the on disk size (see
+ * onDiskLength())
+ */
+ public long uncompressedLength()
+ {
+ return dfile.length;
+ }
+
+ /**
+ * @return The length in bytes of the on disk size for this SSTable. For
+ * compressed files, this is not the same thing as the data length (see
+ * length())
+ */
+ public long onDiskLength()
+ {
+ return dfile.onDiskLength;
+ }
+
+ /**
+ * Mark the sstable as obsolete, i.e., compacted into newer sstables.
+ *
+ * When calling this function, the caller must ensure that the SSTableReader is not referenced anywhere
+ * except for threads holding a reference.
+ *
+ * @return true if the this is the first time the file was marked obsolete. Calling this
+ * multiple times is usually buggy (see exceptions in DataTracker.unmarkCompacting and removeOldSSTablesSize).
+ */
+ public boolean markObsolete()
+ {
+ if (logger.isDebugEnabled())
+ logger.debug("Marking {} compacted", getFilename());
+
+ synchronized (tidy.global)
+ {
+ assert !tidy.isReplaced;
+ }
+ return !tidy.global.isCompacted.getAndSet(true);
+ }
+
+ public boolean isMarkedCompacted()
+ {
+ return tidy.global.isCompacted.get();
+ }
+
+ public void markSuspect()
+ {
+ if (logger.isDebugEnabled())
+ logger.debug("Marking {} as a suspect for blacklisting.", getFilename());
+
+ isSuspect.getAndSet(true);
+ }
+
+ public boolean isMarkedSuspect()
+ {
+ return isSuspect.get();
+ }
+
+
+ /**
+ * I/O SSTableScanner
+ * @return A Scanner for seeking over the rows of the SSTable.
+ */
+ public ISSTableScanner getScanner()
+ {
+ return getScanner((RateLimiter) null);
+ }
+
+ public ISSTableScanner getScanner(RateLimiter limiter)
+ {
+ return getScanner(DataRange.allData(partitioner), limiter);
+ }
+
+ /**
+ *
+ * @param dataRange filter to use when reading the columns
+ * @return A Scanner for seeking over the rows of the SSTable.
+ */
+ public ISSTableScanner getScanner(DataRange dataRange)
+ {
+ return getScanner(dataRange, null);
+ }
+
+ /**
+ * Direct I/O SSTableScanner over a defined range of tokens.
+ *
+ * @param range the range of keys to cover
+ * @return A Scanner for seeking over the rows of the SSTable.
+ */
+ public ISSTableScanner getScanner(Range<Token> range, RateLimiter limiter)
+ {
+ if (range == null)
+ return getScanner(limiter);
+ return getScanner(Collections.singletonList(range), limiter);
+ }
+
+ /**
+ * Direct I/O SSTableScanner over a defined collection of ranges of tokens.
+ *
+ * @param ranges the range of keys to cover
+ * @return A Scanner for seeking over the rows of the SSTable.
+ */
+ public abstract ISSTableScanner getScanner(Collection<Range<Token>> ranges, RateLimiter limiter);
+
+ /**
+ *
+ * @param dataRange filter to use when reading the columns
+ * @return A Scanner for seeking over the rows of the SSTable.
+ */
+ public abstract ISSTableScanner getScanner(DataRange dataRange, RateLimiter limiter);
+
+
+
+ public FileDataInput getFileDataInput(long position)
+ {
+ return dfile.getSegment(position);
+ }
+
+ /**
+ * Tests if the sstable contains data newer than the given age param (in localhost currentMilli time).
+ * This works in conjunction with maxDataAge which is an upper bound on the create of data in this sstable.
+ * @param age The age to compare the maxDataAre of this sstable. Measured in millisec since epoc on this host
+ * @return True iff this sstable contains data that's newer than the given age parameter.
+ */
+ public boolean newSince(long age)
+ {
+ return maxDataAge > age;
+ }
+
+ public void createLinks(String snapshotDirectoryPath)
+ {
+ for (Component component : components)
+ {
+ File sourceFile = new File(descriptor.filenameFor(component));
+ File targetLink = new File(snapshotDirectoryPath, sourceFile.getName());
+ FileUtils.createHardLink(sourceFile, targetLink);
+ }
+ }
+
+ public boolean isRepaired()
+ {
+ return sstableMetadata.repairedAt != ActiveRepairService.UNREPAIRED_SSTABLE;
+ }
+
+ public SSTableReader getCurrentReplacement()
+ {
+ return tidy.global.live;
+ }
+
+ /**
+ * TODO: Move someplace reusable
+ */
+ public abstract static class Operator
+ {
+ public static final Operator EQ = new Equals();
+ public static final Operator GE = new GreaterThanOrEqualTo();
+ public static final Operator GT = new GreaterThan();
+
+ /**
+ * @param comparison The result of a call to compare/compareTo, with the desired field on the rhs.
+ * @return less than 0 if the operator cannot match forward, 0 if it matches, greater than 0 if it might match forward.
+ */
+ public abstract int apply(int comparison);
+
+ final static class Equals extends Operator
+ {
+ public int apply(int comparison) { return -comparison; }
+ }
+
+ final static class GreaterThanOrEqualTo extends Operator
+ {
+ public int apply(int comparison) { return comparison >= 0 ? 0 : 1; }
+ }
+
+ final static class GreaterThan extends Operator
+ {
+ public int apply(int comparison) { return comparison > 0 ? 0 : 1; }
+ }
+ }
+
+ public long getBloomFilterFalsePositiveCount()
+ {
+ return bloomFilterTracker.getFalsePositiveCount();
+ }
+
+ public long getRecentBloomFilterFalsePositiveCount()
+ {
+ return bloomFilterTracker.getRecentFalsePositiveCount();
+ }
+
+ public long getBloomFilterTruePositiveCount()
+ {
+ return bloomFilterTracker.getTruePositiveCount();
+ }
+
+ public long getRecentBloomFilterTruePositiveCount()
+ {
+ return bloomFilterTracker.getRecentTruePositiveCount();
+ }
+
+ public InstrumentingCache<KeyCacheKey, RowIndexEntry> getKeyCache()
+ {
+ return keyCache;
+ }
+
+ public EstimatedHistogram getEstimatedRowSize()
+ {
+ return sstableMetadata.estimatedRowSize;
+ }
+
+ public EstimatedHistogram getEstimatedColumnCount()
+ {
+ return sstableMetadata.estimatedColumnCount;
+ }
+
+ public double getEstimatedDroppableTombstoneRatio(int gcBefore)
+ {
+ return sstableMetadata.getEstimatedDroppableTombstoneRatio(gcBefore);
+ }
+
+ public double getDroppableTombstonesBefore(int gcBefore)
+ {
+ return sstableMetadata.getDroppableTombstonesBefore(gcBefore);
+ }
+
+ public double getCompressionRatio()
+ {
+ return sstableMetadata.compressionRatio;
+ }
+
+ public ReplayPosition getReplayPosition()
+ {
+ return sstableMetadata.replayPosition;
+ }
+
+ public long getMinTimestamp()
+ {
+ return sstableMetadata.minTimestamp;
+ }
+
+ public long getMaxTimestamp()
+ {
+ return sstableMetadata.maxTimestamp;
+ }
+
+ public Set<Integer> getAncestors()
+ {
+ try
+ {
+ CompactionMetadata compactionMetadata = (CompactionMetadata) descriptor.getMetadataSerializer().deserialize(descriptor, MetadataType.COMPACTION);
+ return compactionMetadata.ancestors;
+ }
+ catch (IOException e)
+ {
+ SSTableReader.logOpenException(descriptor, e);
+ return Collections.emptySet();
+ }
+ }
+
+ public int getSSTableLevel()
+ {
+ return sstableMetadata.sstableLevel;
+ }
+
+ /**
+ * Reloads the sstable metadata from disk.
+ *
+ * Called after level is changed on sstable, for example if the sstable is dropped to L0
+ *
+ * Might be possible to remove in future versions
+ *
+ * @throws IOException
+ */
+ public void reloadSSTableMetadata() throws IOException
+ {
+ this.sstableMetadata = (StatsMetadata) descriptor.getMetadataSerializer().deserialize(descriptor, MetadataType.STATS);
+ }
+
+ public StatsMetadata getSSTableMetadata()
+ {
+ return sstableMetadata;
+ }
+
+ public RandomAccessReader openDataReader(RateLimiter limiter)
+ {
+ assert limiter != null;
+ return dfile.createThrottledReader(limiter);
+ }
+
+ public RandomAccessReader openDataReader()
+ {
+ return dfile.createReader();
+ }
+
+ public RandomAccessReader openIndexReader()
+ {
+ return ifile.createReader();
+ }
+
+ /**
+ * @param component component to get timestamp.
+ * @return last modified time for given component. 0 if given component does not exist or IO error occurs.
+ */
+ public long getCreationTimeFor(Component component)
+ {
+ return new File(descriptor.filenameFor(component)).lastModified();
+ }
+
+ /**
+ * @return Number of key cache hit
+ */
+ public long getKeyCacheHit()
+ {
+ return keyCacheHit.get();
+ }
+
+ /**
+ * @return Number of key cache request
+ */
+ public long getKeyCacheRequest()
+ {
+ return keyCacheRequest.get();
+ }
+
+ /**
+ * Increment the total row read count and read rate for this SSTable. This should not be incremented for range
+ * slice queries, row cache hits, or non-query reads, like compaction.
+ */
+ public void incrementReadCount()
+ {
+ if (readMeter != null)
+ readMeter.mark();
+ }
+
+ public static class SizeComparator implements Comparator<SSTableReader>
+ {
+ public int compare(SSTableReader o1, SSTableReader o2)
+ {
+ return Longs.compare(o1.onDiskLength(), o2.onDiskLength());
+ }
+ }
+
+ public Ref<SSTableReader> tryRef()
+ {
+ return selfRef.tryRef();
+ }
+
+ public Ref<SSTableReader> selfRef()
+ {
+ return selfRef;
+ }
+
+ public Ref<SSTableReader> ref()
+ {
+ return selfRef.ref();
+ }
+
+ void setup()
+ {
+ tidy.setup(this);
+ this.readMeter = tidy.global.readMeter;
+ }
+
+ @VisibleForTesting
+ public void overrideReadMeter(RestorableMeter readMeter)
+ {
+ this.readMeter = tidy.global.readMeter = readMeter;
+ }
+
+ /**
+ * One instance per SSTableReader we create. This references the type-shared tidy, which in turn references
+ * the globally shared tidy, i.e.
+ *
+ * InstanceTidier => DescriptorTypeTitdy => GlobalTidy
+ *
+ * We can create many InstanceTidiers (one for every time we reopen an sstable with MOVED_START for example), but there can only be
+ * two DescriptorTypeTidy (FINAL and TEMPLINK) and only one GlobalTidy for one single logical sstable.
+ *
+ * When the InstanceTidier cleansup, it releases its reference to its DescriptorTypeTidy; when all InstanceTidiers
+ * for that type have run, the DescriptorTypeTidy cleansup. DescriptorTypeTidy behaves in the same way towards GlobalTidy.
+ *
+ * For ease, we stash a direct reference to both our type-shared and global tidier
+ */
+ private static final class InstanceTidier implements Tidy
+ {
+ private final Descriptor descriptor;
+ private final CFMetaData metadata;
+ private IFilter bf;
+ private IndexSummary summary;
+
+ private SegmentedFile dfile;
+ private SegmentedFile ifile;
+ private Runnable runOnClose;
+ private boolean isReplaced = false;
+
+ // a reference to our shared per-Descriptor.Type tidy instance, that
+ // we will release when we are ourselves released
+ private Ref<DescriptorTypeTidy> typeRef;
+
+ // a convenience stashing of the shared per-descriptor-type tidy instance itself
+ // and the per-logical-sstable globally shared state that it is linked to
+ private DescriptorTypeTidy type;
+ private GlobalTidy global;
+
+ private boolean setup;
+
+ void setup(SSTableReader reader)
+ {
+ this.setup = true;
+ this.bf = reader.bf;
+ this.summary = reader.indexSummary;
+ this.dfile = reader.dfile;
+ this.ifile = reader.ifile;
+ // get a new reference to the shared descriptor-type tidy
+ this.typeRef = DescriptorTypeTidy.get(reader);
+ this.type = typeRef.get();
+ this.global = type.globalRef.get();
+ }
+
+ InstanceTidier(Descriptor descriptor, CFMetaData metadata)
+ {
+ this.descriptor = descriptor;
+ this.metadata = metadata;
+ }
+
+ public void tidy()
+ {
+ // don't try to cleanup if the sstablereader was never fully constructed
+ if (!setup)
+ return;
+
+ final ColumnFamilyStore cfs = Schema.instance.getColumnFamilyStoreInstance(metadata.cfId);
+ final OpOrder.Barrier barrier;
+ if (cfs != null)
+ {
+ barrier = cfs.readOrdering.newBarrier();
+ barrier.issue();
+ }
+ else
+ barrier = null;
+
+ ScheduledExecutors.nonPeriodicTasks.execute(new Runnable()
+ {
+ public void run()
+ {
+ if (barrier != null)
+ barrier.await();
+ bf.close();
+ if (summary != null)
+ summary.close();
+ if (runOnClose != null)
+ runOnClose.run();
+ dfile.close();
+ ifile.close();
+ typeRef.release();
+ }
+ });
+ }
+
+ public String name()
+ {
+ return descriptor.toString();
+ }
+
+ void releaseSummary()
+ {
+ summary.close();
+ assert summary.isCleanedUp();
+ summary = null;
+ }
+ }
+
+ /**
+ * One shared between all instances of a given Descriptor.Type.
+ * Performs only two things: the deletion of the sstables for the type,
+ * if necessary; and the shared reference to the globally shared state.
+ *
+ * All InstanceTidiers, on setup(), ask the static get() method for their shared state,
+ * and stash a reference to it to be released when they are. Once all such references are
+ * released, the shared tidy will be performed.
+ */
+ static final class DescriptorTypeTidy implements Tidy
+ {
+ // keyed by REAL descriptor (TMPLINK/FINAL), mapping to the shared DescriptorTypeTidy for that descriptor
+ static final ConcurrentMap<Descriptor, Ref<DescriptorTypeTidy>> lookup = new ConcurrentHashMap<>();
+
+ private final Descriptor desc;
+ private final Ref<GlobalTidy> globalRef;
+ private final SSTableDeletingTask deletingTask;
+
+ DescriptorTypeTidy(Descriptor desc, SSTableReader sstable)
+ {
+ this.desc = desc;
+ this.deletingTask = new SSTableDeletingTask(desc, sstable);
+ // get a new reference to the shared global tidy
+ this.globalRef = GlobalTidy.get(sstable);
+ }
+
+ public void tidy()
+ {
+ lookup.remove(desc);
+ boolean isCompacted = globalRef.get().isCompacted.get();
+ globalRef.release();
+ switch (desc.type)
+ {
+ case FINAL:
+ if (isCompacted)
+ deletingTask.run();
+ break;
+ case TEMPLINK:
+ deletingTask.run();
+ break;
+ default:
+ throw new IllegalStateException();
+ }
+ }
+
+ public String name()
+ {
+ return desc.toString();
+ }
+
+ // get a new reference to the shared DescriptorTypeTidy for this sstable
+ public static Ref<DescriptorTypeTidy> get(SSTableReader sstable)
+ {
+ Descriptor desc = sstable.descriptor;
+ if (sstable.openReason == OpenReason.EARLY)
+ desc = desc.asType(Descriptor.Type.TEMPLINK);
+ Ref<DescriptorTypeTidy> refc = lookup.get(desc);
+ if (refc != null)
+ return refc.ref();
+ final DescriptorTypeTidy tidy = new DescriptorTypeTidy(desc, sstable);
+ refc = new Ref<>(tidy, tidy);
+ Ref<?> ex = lookup.putIfAbsent(desc, refc);
+ assert ex == null;
+ return refc;
+ }
+ }
+
+ /**
+ * One instance per logical sstable. This both tracks shared cleanup and some shared state related
+ * to the sstable's lifecycle. All DescriptorTypeTidy instances, on construction, obtain a reference to us
+ * via our static get(). There should only ever be at most two such references extant at any one time,
+ * since only TMPLINK and FINAL type descriptors should be open as readers. When all files of both
+ * kinds have been released, this shared tidy will be performed.
+ */
+ static final class GlobalTidy implements Tidy
+ {
+ // keyed by FINAL descriptor, mapping to the shared GlobalTidy for that descriptor
+ static final ConcurrentMap<Descriptor, Ref<GlobalTidy>> lookup = new ConcurrentHashMap<>();
+
+ private final Descriptor desc;
+ // a single convenience property for getting the most recent version of an sstable, not related to tidying
+ private SSTableReader live;
+ // the readMeter that is shared between all instances of the sstable, and can be overridden in all of them
+ // at once also, for testing purposes
+ private RestorableMeter readMeter;
+ // the scheduled persistence of the readMeter, that we will cancel once all instances of this logical
+ // sstable have been released
+ private final ScheduledFuture readMeterSyncFuture;
+ // shared state managing if the logical sstable has been compacted; this is used in cleanup both here
+ // and in the FINAL type tidier
+ private final AtomicBoolean isCompacted;
+
+ GlobalTidy(final SSTableReader reader)
+ {
+ this.desc = reader.descriptor;
+ this.isCompacted = new AtomicBoolean();
+ this.live = reader;
+ // Don't track read rates for tables in the system keyspace and don't bother trying to load or persist
+ // the read meter when in client mode.
+ if (SystemKeyspace.NAME.equals(desc.ksname))
+ {
+ readMeter = null;
+ readMeterSyncFuture = null;
+ return;
+ }
+
+ readMeter = SystemKeyspace.getSSTableReadMeter(desc.ksname, desc.cfname, desc.generation);
+ // sync the average read rate to system.sstable_activity every five minutes, starting one minute from now
+ readMeterSyncFuture = syncExecutor.scheduleAtFixedRate(new Runnable()
+ {
+ public void run()
+ {
+ if (!isCompacted.get())
+ {
+ meterSyncThrottle.acquire();
+ SystemKeyspace.persistSSTableReadMeter(desc.ksname, desc.cfname, desc.generation, readMeter);
+ }
+ }
+ }, 1, 5, TimeUnit.MINUTES);
+ }
+
+ public void tidy()
+ {
+ lookup.remove(desc);
+ if (readMeterSyncFuture != null)
+ readMeterSyncFuture.cancel(true);
+ if (isCompacted.get())
+ SystemKeyspace.clearSSTableReadMeter(desc.ksname, desc.cfname, desc.generation);
+ // don't ideally want to dropPageCache for the file until all instances have been released
+ CLibrary.trySkipCache(desc.filenameFor(Component.DATA), 0, 0);
+ CLibrary.trySkipCache(desc.filenameFor(Component.PRIMARY_INDEX), 0, 0);
+ }
+
+ public String name()
+ {
+ return desc.toString();
+ }
+
+ // get a new reference to the shared GlobalTidy for this sstable
+ public static Ref<GlobalTidy> get(SSTableReader sstable)
+ {
+ Descriptor descriptor = sstable.descriptor;
+ Ref<GlobalTidy> refc = lookup.get(descriptor);
+ if (refc != null)
+ return refc.ref();
+ final GlobalTidy tidy = new GlobalTidy(sstable);
+ refc = new Ref<>(tidy, tidy);
+ Ref<?> ex = lookup.putIfAbsent(descriptor, refc);
+ assert ex == null;
+ return refc;
+ }
+ }
+
+ public static abstract class Factory
+ {
+ public abstract SSTableReader open(final Descriptor descriptor,
+ Set<Component> components,
+ CFMetaData metadata,
+ IPartitioner partitioner,
+ Long maxDataAge,
+ StatsMetadata sstableMetadata,
+ OpenReason openReason);
+
+ }
+}
http://git-wip-us.apache.org/repos/asf/cassandra/blob/8e115dac/test/unit/org/apache/cassandra/io/sstable/IndexSummaryTest.java
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