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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2021/01/13 07:56:09 UTC
[GitHub] [iotdb] JackieTien97 opened a new pull request #2488: Add DirectByteBufferPool for WAL
JackieTien97 opened a new pull request #2488:
URL: https://github.com/apache/iotdb/pull/2488
There are two problems in the process of current wal flushing.
- Because wal uses FileChannel while flushing, it involves one more memory copy. FileChannel will copy the contents of HeapByteBuffer to DirectByteBuffer before calling native write method, and then call native write with DirectByteBuffer as a parameter, which will cause An extra memory copy operation.
- Although 0.12 uses the thread pool to complete asynchronous flushing, to a certain extent, solves the problem of the surge of non-heap memory caused by the wal of 0.11, but when the non-heap memory is released is still depends on the jvm (depends on when gc is performed), jvm cannot know whether non-heap memory should be released in time, so it may also cause non-heap memory to not be released in time, but we are clear about that.
So, I want to use DirectByteBufferPool to solve the above two questions. The detailed design documents is on the confluence(https://cwiki.apache.org/confluence/display/IOTDB/DirectByteBuffer+Pool+for+WAL).
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[GitHub] [iotdb] JackieTien97 commented on a change in pull request #2488: Add DirectByteBufferPool for WAL
Posted by GitBox <gi...@apache.org>.
JackieTien97 commented on a change in pull request #2488:
URL: https://github.com/apache/iotdb/pull/2488#discussion_r558017828
##########
File path: server/src/main/java/org/apache/iotdb/db/engine/storagegroup/StorageGroupProcessor.java
##########
@@ -261,6 +268,79 @@ public void setReady(boolean ready) {
private List<CloseFileListener> customCloseFileListeners = Collections.emptyList();
private List<FlushListener> customFlushListeners = Collections.emptyList();
+ private static final int WAL_BUFFER_SIZE =
+ IoTDBDescriptor.getInstance().getConfig().getWalBufferSize() / 2;
+
+ private static final int MAX_WAL_BYTEBUFFER_NUM =
+ IoTDBDescriptor.getInstance().getConfig().getConcurrentWritingTimePartition() * 4;
+
+ private static final long DEFAULT_POOL_TRIM_INTERVAL_MILLIS = 10_000;
+
+ private final Deque<ByteBuffer> walByteBufferPool = new LinkedList<>();
+
+ private int currentWalPoolSize = 0;
+
+
+ /**
+ * get the direct byte buffer from pool, each fetch contains two ByteBuffer
+ */
+ public ByteBuffer[] getWalDirectByteBuffer() {
+ ByteBuffer[] res = new ByteBuffer[2];
+ synchronized (walByteBufferPool) {
+ while (walByteBufferPool.isEmpty() && currentWalPoolSize + 2 > MAX_WAL_BYTEBUFFER_NUM) {
+ try {
+ walByteBufferPool.wait();
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt();
+ logger
+ .error("getDirectByteBuffer occurs error while waiting for DirectByteBuffer"
+ + "group {}", storageGroupName, e);
+ }
+ }
+ // If the queue is not empty, it must have at least two.
+ if (!walByteBufferPool.isEmpty()) {
+ res[0] = walByteBufferPool.pollFirst();
+ res[1] = walByteBufferPool.pollFirst();
+ } else {
+ // if the queue is empty and current size is less than MAX_BYTEBUFFER_NUM
+ // we can construct another two more new byte buffer
+ currentWalPoolSize += 2;
+ res[0] = ByteBuffer.allocateDirect(WAL_BUFFER_SIZE);
+ res[1] = ByteBuffer.allocateDirect(WAL_BUFFER_SIZE);
+ }
+ }
+ return res;
+ }
+
+ /**
+ * put the byteBuffer back to pool
+ */
+ public void releaseWalBuffer(ByteBuffer[] byteBuffers) {
+ for (ByteBuffer byteBuffer : byteBuffers) {
+ byteBuffer.clear();
+ }
+ synchronized (walByteBufferPool) {
+ walByteBufferPool.addLast(byteBuffers[0]);
+ walByteBufferPool.addLast(byteBuffers[1]);
+ walByteBufferPool.notifyAll();
+ }
+ }
+
+ /**
+ * trim the size of the pool and release the memory of needless direct byte buffer
+ */
+ private void trimTask() {
+ synchronized (walByteBufferPool) {
+ int expectedSize =
+ (workSequenceTsFileProcessors.size() + workUnsequenceTsFileProcessors.size()) * 2;
+ while (expectedSize < currentWalPoolSize && !walByteBufferPool.isEmpty()) {
+ MmapUtil.clean((MappedByteBuffer) walByteBufferPool.removeLast());
+ MmapUtil.clean((MappedByteBuffer) walByteBufferPool.removeLast());
+ currentWalPoolSize -= 2;
+ }
+ }
+ }
Review comment:
fix
##########
File path: server/src/main/java/org/apache/iotdb/db/utils/MmapUtil.java
##########
@@ -0,0 +1,31 @@
+/*
+ * 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.utils;
+
+import io.netty.util.internal.PlatformDependent;
+import java.nio.MappedByteBuffer;
+
+public class MmapUtil {
+
+ public static void clean(MappedByteBuffer mappedByteBuffer) {
+ if (mappedByteBuffer == null || !mappedByteBuffer.isDirect() || mappedByteBuffer.capacity()== 0)
+ return;
Review comment:
fix
##########
File path: server/src/main/java/org/apache/iotdb/db/writelog/node/ExclusiveWriteLogNode.java
##########
@@ -92,6 +90,11 @@ public ExclusiveWriteLogNode(String identifier) {
}
}
+ public void initBuffer(ByteBuffer[] byteBuffers) {
+ this.logBufferWorking = byteBuffers[0];
+ this.logBufferIdle = byteBuffers[1];
+ }
Review comment:
fix
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[GitHub] [iotdb] jixuan1989 commented on a change in pull request #2488: Add DirectByteBufferPool for WAL
Posted by GitBox <gi...@apache.org>.
jixuan1989 commented on a change in pull request #2488:
URL: https://github.com/apache/iotdb/pull/2488#discussion_r559120656
##########
File path: pom.xml
##########
@@ -229,7 +229,17 @@
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
- <version>4.1.42.Final</version>
+ <version>4.1.27.Final</version>
Review comment:
need to keep consensus of netty versions.
##########
File path: server/pom.xml
##########
@@ -47,6 +47,20 @@
</snapshots>
</repository>
</repositories>
+ <dependencyManagement>
Review comment:
why dependencyManagement here?
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[GitHub] [iotdb] HTHou commented on a change in pull request #2488: Add DirectByteBufferPool for WAL
Posted by GitBox <gi...@apache.org>.
HTHou commented on a change in pull request #2488:
URL: https://github.com/apache/iotdb/pull/2488#discussion_r556330461
##########
File path: server/src/main/java/org/apache/iotdb/db/engine/storagegroup/StorageGroupInfo.java
##########
@@ -94,13 +100,46 @@ public void setLastReportedSize(long size) {
}
/**
- * When a TsFileProcessor is closing, remove it from reportedTsps, and report to systemInfo
- * to update SG cost.
- *
+ * When a TsFileProcessor is closing, remove it from reportedTsps, and report to systemInfo to
+ * update SG cost.
+ *
* @param tsFileProcessor
*/
public void closeTsFileProcessorAndReportToSystem(TsFileProcessor tsFileProcessor) {
reportedTsps.remove(tsFileProcessor);
SystemInfo.getInstance().resetStorageGroupStatus(this, true);
}
+
+ public Supplier<ByteBuffer[]> getWalSupplier() {
+ if (storageGroupProcessor != null) {
+ return storageGroupProcessor::getWalDirectByteBuffer;
+ } else { // only happens in test
+ return this::walSupplier;
+ }
+ }
+
+ @TestOnly
+ private ByteBuffer[] walSupplier() {
+ ByteBuffer[] buffers = new ByteBuffer[2];
+ buffers[0] = ByteBuffer
+ .allocateDirect(IoTDBDescriptor.getInstance().getConfig().getWalBufferSize() / 2);
+ buffers[0] = ByteBuffer
Review comment:
Should be buffers[1]?
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[GitHub] [iotdb] sonarcloud[bot] removed a comment on pull request #2488: Add DirectByteBufferPool for WAL
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[GitHub] [iotdb] qiaojialin merged pull request #2488: Add DirectByteBufferPool for WAL
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URL: https://github.com/apache/iotdb/pull/2488
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[GitHub] [iotdb] sonarcloud[bot] removed a comment on pull request #2488: Add DirectByteBufferPool for WAL
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URL: https://github.com/apache/iotdb/pull/2488#issuecomment-760626371
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[GitHub] [iotdb] sonarcloud[bot] removed a comment on pull request #2488: Add DirectByteBufferPool for WAL
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[GitHub] [iotdb] sonarcloud[bot] commented on pull request #2488: Add DirectByteBufferPool for WAL
Posted by GitBox <gi...@apache.org>.
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URL: https://github.com/apache/iotdb/pull/2488#issuecomment-759276829
SonarCloud Quality Gate failed.
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[GitHub] [iotdb] sonarcloud[bot] commented on pull request #2488: Add DirectByteBufferPool for WAL
Posted by GitBox <gi...@apache.org>.
sonarcloud[bot] commented on pull request #2488:
URL: https://github.com/apache/iotdb/pull/2488#issuecomment-759633541
Kudos, SonarCloud Quality Gate passed!
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[GitHub] [iotdb] jt2594838 commented on a change in pull request #2488: Add DirectByteBufferPool for WAL
Posted by GitBox <gi...@apache.org>.
jt2594838 commented on a change in pull request #2488:
URL: https://github.com/apache/iotdb/pull/2488#discussion_r557821833
##########
File path: server/src/main/java/org/apache/iotdb/db/engine/storagegroup/StorageGroupProcessor.java
##########
@@ -261,6 +268,79 @@ public void setReady(boolean ready) {
private List<CloseFileListener> customCloseFileListeners = Collections.emptyList();
private List<FlushListener> customFlushListeners = Collections.emptyList();
+ private static final int WAL_BUFFER_SIZE =
+ IoTDBDescriptor.getInstance().getConfig().getWalBufferSize() / 2;
+
+ private static final int MAX_WAL_BYTEBUFFER_NUM =
+ IoTDBDescriptor.getInstance().getConfig().getConcurrentWritingTimePartition() * 4;
+
+ private static final long DEFAULT_POOL_TRIM_INTERVAL_MILLIS = 10_000;
+
+ private final Deque<ByteBuffer> walByteBufferPool = new LinkedList<>();
+
+ private int currentWalPoolSize = 0;
Review comment:
This field is used in a waiting condition, so maybe it is better made volatile?
##########
File path: server/src/main/java/org/apache/iotdb/db/writelog/node/ExclusiveWriteLogNode.java
##########
@@ -92,6 +90,11 @@ public ExclusiveWriteLogNode(String identifier) {
}
}
+ public void initBuffer(ByteBuffer[] byteBuffers) {
+ this.logBufferWorking = byteBuffers[0];
+ this.logBufferIdle = byteBuffers[1];
+ }
Review comment:
Maybe you can keep `byteBuffers` as a field, so `delete()` can be simpler.
##########
File path: server/src/main/java/org/apache/iotdb/db/engine/storagegroup/StorageGroupProcessor.java
##########
@@ -261,6 +268,79 @@ public void setReady(boolean ready) {
private List<CloseFileListener> customCloseFileListeners = Collections.emptyList();
private List<FlushListener> customFlushListeners = Collections.emptyList();
+ private static final int WAL_BUFFER_SIZE =
+ IoTDBDescriptor.getInstance().getConfig().getWalBufferSize() / 2;
+
+ private static final int MAX_WAL_BYTEBUFFER_NUM =
+ IoTDBDescriptor.getInstance().getConfig().getConcurrentWritingTimePartition() * 4;
+
+ private static final long DEFAULT_POOL_TRIM_INTERVAL_MILLIS = 10_000;
+
+ private final Deque<ByteBuffer> walByteBufferPool = new LinkedList<>();
+
+ private int currentWalPoolSize = 0;
+
+
+ /**
+ * get the direct byte buffer from pool, each fetch contains two ByteBuffer
+ */
+ public ByteBuffer[] getWalDirectByteBuffer() {
+ ByteBuffer[] res = new ByteBuffer[2];
+ synchronized (walByteBufferPool) {
+ while (walByteBufferPool.isEmpty() && currentWalPoolSize + 2 > MAX_WAL_BYTEBUFFER_NUM) {
+ try {
+ walByteBufferPool.wait();
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt();
+ logger
+ .error("getDirectByteBuffer occurs error while waiting for DirectByteBuffer"
+ + "group {}", storageGroupName, e);
+ }
+ }
+ // If the queue is not empty, it must have at least two.
+ if (!walByteBufferPool.isEmpty()) {
+ res[0] = walByteBufferPool.pollFirst();
+ res[1] = walByteBufferPool.pollFirst();
+ } else {
+ // if the queue is empty and current size is less than MAX_BYTEBUFFER_NUM
+ // we can construct another two more new byte buffer
+ currentWalPoolSize += 2;
+ res[0] = ByteBuffer.allocateDirect(WAL_BUFFER_SIZE);
+ res[1] = ByteBuffer.allocateDirect(WAL_BUFFER_SIZE);
+ }
+ }
+ return res;
+ }
+
+ /**
+ * put the byteBuffer back to pool
+ */
+ public void releaseWalBuffer(ByteBuffer[] byteBuffers) {
+ for (ByteBuffer byteBuffer : byteBuffers) {
+ byteBuffer.clear();
+ }
+ synchronized (walByteBufferPool) {
+ walByteBufferPool.addLast(byteBuffers[0]);
+ walByteBufferPool.addLast(byteBuffers[1]);
+ walByteBufferPool.notifyAll();
+ }
+ }
+
+ /**
+ * trim the size of the pool and release the memory of needless direct byte buffer
+ */
+ private void trimTask() {
+ synchronized (walByteBufferPool) {
+ int expectedSize =
+ (workSequenceTsFileProcessors.size() + workUnsequenceTsFileProcessors.size()) * 2;
+ while (expectedSize < currentWalPoolSize && !walByteBufferPool.isEmpty()) {
+ MmapUtil.clean((MappedByteBuffer) walByteBufferPool.removeLast());
+ MmapUtil.clean((MappedByteBuffer) walByteBufferPool.removeLast());
+ currentWalPoolSize -= 2;
+ }
+ }
+ }
Review comment:
The strategy may introduce thrashing when a TsFile is closed and `workSequenceTsFileProcessors.size()` is reduced for one instant, while another file just returned its buffers. If `trimTask()` is triggered at the moment, 2 buffers that could have been used by the next file are cleaned.
One possible improvement is to record the timestamp when the pool becomes non-empty, unset it when the pool becomes empty, and only trim a pool if it has been non-empty for a relatively long time, so the just-returned buffers will not be purged.
##########
File path: server/src/main/java/org/apache/iotdb/db/utils/MmapUtil.java
##########
@@ -0,0 +1,31 @@
+/*
+ * 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.utils;
+
+import io.netty.util.internal.PlatformDependent;
+import java.nio.MappedByteBuffer;
+
+public class MmapUtil {
+
+ public static void clean(MappedByteBuffer mappedByteBuffer) {
+ if (mappedByteBuffer == null || !mappedByteBuffer.isDirect() || mappedByteBuffer.capacity()== 0)
+ return;
Review comment:
Mind the code style that `{}` should be used.
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[GitHub] [iotdb] sonarcloud[bot] commented on pull request #2488: Add DirectByteBufferPool for WAL
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[GitHub] [iotdb] jt2594838 commented on a change in pull request #2488: Add DirectByteBufferPool for WAL
Posted by GitBox <gi...@apache.org>.
jt2594838 commented on a change in pull request #2488:
URL: https://github.com/apache/iotdb/pull/2488#discussion_r559278962
##########
File path: server/src/main/java/org/apache/iotdb/db/engine/storagegroup/StorageGroupProcessor.java
##########
@@ -280,6 +280,13 @@ public void setReady(boolean ready) {
private int currentWalPoolSize = 0;
+ // this field is used to avoid when one writer release bytebuffer back to pool,
+ // and the next writer has already arrived, but the check thread get the lock first, it find the pool
+ // is not empty, so it free the memory. When the next writer get the lock, it will apply the memory again.
+ // So our free memory strategy is only when the expected size less than the current pool size
+ // and the pool is not empty and the time interval since the pool is not empty is larger than DEFAULT_POOL_TRIM_INTERVAL_MILLIS
+ private long timeWhenPoolNotEmpty = Long.MAX_VALUE;
Review comment:
Please check for grammar errors.
##########
File path: server/src/main/java/org/apache/iotdb/db/engine/storagegroup/StorageGroupProcessor.java
##########
@@ -320,6 +331,10 @@ public void releaseWalBuffer(ByteBuffer[] byteBuffers) {
byteBuffer.clear();
}
synchronized (walByteBufferPool) {
+ // if the pool is empty before, update the time
+ if (walByteBufferPool.isEmpty()) {
+ timeWhenPoolNotEmpty = System.nanoTime();
+ }
Review comment:
Maybe `currentTimeMillis` is enough.
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[GitHub] [iotdb] sonarcloud[bot] commented on pull request #2488: Add DirectByteBufferPool for WAL
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[GitHub] [iotdb] sonarcloud[bot] commented on pull request #2488: Add DirectByteBufferPool for WAL
Posted by GitBox <gi...@apache.org>.
sonarcloud[bot] commented on pull request #2488:
URL: https://github.com/apache/iotdb/pull/2488#issuecomment-759321751
Kudos, SonarCloud Quality Gate passed!
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[GitHub] [iotdb] sonarcloud[bot] removed a comment on pull request #2488: Add DirectByteBufferPool for WAL
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