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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2020/05/15 07:51:49 UTC
[GitHub] [incubator-iotdb] JackieTien97 opened a new pull request #1212: [IOTDB-680] Make LRUCache more accurate
JackieTien97 opened a new pull request #1212:
URL: https://github.com/apache/incubator-iotdb/pull/1212
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[GitHub] [incubator-iotdb] sonarcloud[bot] commented on pull request #1212: [IOTDB-680] Make LRUCache more accurate
Posted by GitBox <gi...@apache.org>.
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URL: https://github.com/apache/incubator-iotdb/pull/1212#issuecomment-629752634
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[GitHub] [incubator-iotdb] sonarcloud[bot] commented on pull request #1212: [IOTDB-680] Make LRUCache more accurate
Posted by GitBox <gi...@apache.org>.
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URL: https://github.com/apache/incubator-iotdb/pull/1212#issuecomment-629736986
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[GitHub] [incubator-iotdb] qiaojialin merged pull request #1212: [IOTDB-680] Make LRUCache more accurate
Posted by GitBox <gi...@apache.org>.
qiaojialin merged pull request #1212:
URL: https://github.com/apache/incubator-iotdb/pull/1212
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[GitHub] [incubator-iotdb] sonarcloud[bot] removed a comment on pull request #1212: [IOTDB-680] Make LRUCache more accurate
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sonarcloud[bot] removed a comment on pull request #1212:
URL: https://github.com/apache/incubator-iotdb/pull/1212#issuecomment-629143788
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[GitHub] [incubator-iotdb] sonarcloud[bot] removed a comment on pull request #1212: [IOTDB-680] Make LRUCache more accurate
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[GitHub] [incubator-iotdb] sonarcloud[bot] commented on pull request #1212: [IOTDB-680] Make LRUCache more accurate
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[GitHub] [incubator-iotdb] sonarcloud[bot] commented on pull request #1212: [IOTDB-680] Make LRUCache more accurate
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[GitHub] [incubator-iotdb] qiaojialin commented on a change in pull request #1212: [IOTDB-680] Make LRUCache more accurate
Posted by GitBox <gi...@apache.org>.
qiaojialin commented on a change in pull request #1212:
URL: https://github.com/apache/incubator-iotdb/pull/1212#discussion_r425776930
##########
File path: server/src/main/java/org/apache/iotdb/db/engine/cache/ChunkMetadataCache.java
##########
@@ -47,45 +47,55 @@
private static final Logger logger = LoggerFactory.getLogger(ChunkMetadataCache.class);
private static final IoTDBConfig config = IoTDBDescriptor.getInstance().getConfig();
private static final long MEMORY_THRESHOLD_IN_B = config.getAllocateMemoryForChunkMetaDataCache();
- private static boolean cacheEnable = config.isMetaDataCacheEnable();
+ private static final boolean cacheEnable = config.isMetaDataCacheEnable();
+ private static final long CHUNK_METADATA_FIXED_RAM_SIZE = 160;
+
/**
* key: file path dot deviceId dot sensorId.
* <p>
* value: chunkMetaData list of one timeseries in the file.
*/
- private final LRULinkedHashMap<String, List<ChunkMetadata>> lruCache;
+ private final LRULinkedHashMap<AccountableString, List<ChunkMetadata>> lruCache;
private final ReadWriteLock lock = new ReentrantReadWriteLock();
- private AtomicLong cacheHitNum = new AtomicLong();
- private AtomicLong cacheRequestNum = new AtomicLong();
+ private final AtomicLong cacheHitNum = new AtomicLong();
+ private final AtomicLong cacheRequestNum = new AtomicLong();
private ChunkMetadataCache(long memoryThreshold) {
if (cacheEnable) {
logger.info("ChunkMetadataCache size = " + memoryThreshold);
}
- lruCache = new LRULinkedHashMap<String, List<ChunkMetadata>>(memoryThreshold, true) {
+ lruCache = new LRULinkedHashMap<AccountableString, List<ChunkMetadata>>(memoryThreshold) {
@Override
- protected long calEntrySize(String key, List<ChunkMetadata> value) {
+ protected long calEntrySize(AccountableString key, List<ChunkMetadata> value) {
if (value.isEmpty()) {
- return key.getBytes().length + averageSize * value.size();
+ return RamUsageEstimator.sizeOf(key) + RamUsageEstimator.shallowSizeOf(value);
}
+ long entrySize;
if (count < 10) {
- long currentSize = RamUsageEstimator.shallowSizeOf(value.get(0)) + RamUsageEstimator
- .shallowSizeOf(value.get(0).getStatistics());
+ long currentSize = CHUNK_METADATA_FIXED_RAM_SIZE + RamUsageEstimator
Review comment:
This may be not enough, it also has a statistics, in which different data type may have different occupation, especially the TEXT type.
##########
File path: server/src/main/java/org/apache/iotdb/db/engine/cache/AccountableString.java
##########
@@ -0,0 +1,63 @@
+/*
+ * 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.iotdb.db.engine.cache;
+
+import java.util.Objects;
+import org.apache.iotdb.tsfile.common.cache.Accountable;
+
+public class AccountableString implements Accountable {
+
+ private final String string;
+ private long RAMSize;
Review comment:
```suggestion
private long ramSize;
```
##########
File path: server/src/main/java/org/apache/iotdb/db/engine/cache/TimeSeriesMetadataCache.java
##########
@@ -198,11 +206,14 @@ public void remove(TimeSeriesMetadataCacheKey key) {
lock.writeLock().unlock();
}
- public static class TimeSeriesMetadataCacheKey {
+ public static class TimeSeriesMetadataCacheKey implements Accountable {
+
+ private final String filePath;
+ private final String device;
+ private final String measurement;
+
+ private long RAMSize;
Review comment:
```suggestion
private long ramSize;
```
##########
File path: server/src/main/java/org/apache/iotdb/db/engine/cache/TimeSeriesMetadataCache.java
##########
@@ -134,7 +142,7 @@ public TimeseriesMetadata get(TimeSeriesMetadataCacheKey key, Set<String> allSen
timeSeriesMetadataList.forEach(timeseriesMetadata ->
lruCache.put(new TimeSeriesMetadataCacheKey(key.filePath, key.device,
timeseriesMetadata.getMeasurementId()), timeseriesMetadata));
- return lruCache.get(key);
+ return new TimeseriesMetadata(lruCache.get(key));
Review comment:
As we already replace the reader by resource, do we need to copy?
But the resource may be also removed from memory, so copy is fine...
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