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Subject [GitHub] [hadoop] snvijaya commented on a change in pull request #1907: HADOOP-16854 Fix to prevent OutOfMemoryException and Make the threadpool and bytebuffer pool common across all AbfsOutputStream instances
Date Fri, 27 Mar 2020 04:40:21 GMT
snvijaya commented on a change in pull request #1907: HADOOP-16854 Fix to prevent OutOfMemoryException
and Make the threadpool and bytebuffer pool common across all AbfsOutputStream instances
URL: https://github.com/apache/hadoop/pull/1907#discussion_r399028369
 
 

 ##########
 File path: hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/services/AbfsByteBufferPool.java
 ##########
 @@ -0,0 +1,140 @@
+/**
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.hadoop.fs.azurebfs.services;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Preconditions;
+
+import java.util.concurrent.ArrayBlockingQueue;
+
+import static org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.MAX_VALUE_MAX_AZURE_WRITE_MEM_USAGE_PERCENTAGE;
+import static org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.MIN_VALUE_MAX_AZURE_WRITE_MEM_USAGE_PERCENTAGE;
+
+/**
+ * Pool for byte[]
+ */
+public class AbfsByteBufferPool {
+
+  /**
+   * Queue holding the free buffers.
+   */
+  private ArrayBlockingQueue<byte[]> freeBuffers;
+  /**
+   * Count to track the buffers issued and yet to be returned.
+   */
+  private int numBuffersInUse;
+  /**
+   * Maximum number of buffers that can be in use.
+   */
+  private int maxBuffersInUse;
+  private int bufferSize;
+
+  /**
+   * @param bufferSize                 Size of the byte[] to be returned.
+   * @param maxFreeBuffers             Maximum number of buffers that cab
+   *                                   reside in the pool.
+   * @param maxWriteMemUsagePercentage Maximum percentage of memory that can
+   *                                   be used by the pool from the max
+   *                                   available memory.
+   */
+  public AbfsByteBufferPool(final int bufferSize, final int maxFreeBuffers,
+      final int maxWriteMemUsagePercentage) {
+    Preconditions.checkArgument(maxWriteMemUsagePercentage
+            >= MIN_VALUE_MAX_AZURE_WRITE_MEM_USAGE_PERCENTAGE
+            && maxWriteMemUsagePercentage
+            <= MAX_VALUE_MAX_AZURE_WRITE_MEM_USAGE_PERCENTAGE,
+        "maxWriteMemUsagePercentage should be in range (%s - %s)",
+        MIN_VALUE_MAX_AZURE_WRITE_MEM_USAGE_PERCENTAGE,
+        MAX_VALUE_MAX_AZURE_WRITE_MEM_USAGE_PERCENTAGE);
+    Preconditions
+        .checkArgument(maxFreeBuffers > 0, "maxFreeBuffers cannot be < 1");
+    this.bufferSize = bufferSize;
+    this.numBuffersInUse = 0;
+    freeBuffers = new ArrayBlockingQueue<>(maxFreeBuffers);
+
+    double maxMemoryAllowedForPool =
+        Runtime.getRuntime().maxMemory() * maxWriteMemUsagePercentage / 100;
+    double bufferCountByMemory = maxMemoryAllowedForPool / bufferSize;
+    double bufferCountByMaxFreeBuffers =
+        maxFreeBuffers + Runtime.getRuntime().availableProcessors();
+
+    maxBuffersInUse = (int) Math
 
 Review comment:
   if max is determined at constructor, how can the this bufferpool be utilized better memory
available increases post this point.

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