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https://issues.apache.org/jira/browse/HADOOP-19472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18032403#comment-18032403
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ASF GitHub Bot commented on HADOOP-19472:
-----------------------------------------
anmolanmol1234 commented on code in PR #7669:
URL: https://github.com/apache/hadoop/pull/7669#discussion_r2454309973
##########
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/WriteThreadPoolSizeManager.java:
##########
@@ -0,0 +1,383 @@
+/**
+ * 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.hadoop.fs.azurebfs;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.lang.management.ManagementFactory;
+import java.lang.management.OperatingSystemMXBean;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+
+import org.apache.hadoop.util.concurrent.HadoopExecutors;
+
+import static
org.apache.hadoop.fs.azurebfs.constants.AbfsHttpConstants.LOW_HEAP_SPACE_FACTOR;
+import static
org.apache.hadoop.fs.azurebfs.constants.AbfsHttpConstants.MEDIUM_HEAP_SPACE_FACTOR;
+import static
org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.BYTES_PER_GIGABYTE;
+import static
org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.HIGH_CPU_LOW_MEMORY_REDUCTION_FACTOR;
+import static
org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.HIGH_CPU_REDUCTION_FACTOR;
+import static
org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.HIGH_MEDIUM_HEAP_FACTOR;
+import static
org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.HUNDRED_D;
+import static
org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.LOW_CPU_HEAP_FACTOR;
+import static
org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.LOW_CPU_HIGH_MEMORY_DECREASE_FACTOR;
+import static
org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.LOW_CPU_POOL_SIZE_INCREASE_FACTOR;
+import static
org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.MEDIUM_CPU_LOW_MEMORY_REDUCTION_FACTOR;
+import static
org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.MEDIUM_CPU_REDUCTION_FACTOR;
+import static
org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.THIRTY_SECONDS;
+
+/**
+ * Manages a thread pool for writing operations, adjusting the pool size based
on CPU utilization.
+ */
+public final class WriteThreadPoolSizeManager implements Closeable {
+
+ /* Maximum allowed size for the thread pool. */
+ private final int maxThreadPoolSize;
+ /* Executor for periodically monitoring CPU usage. */
+ private final ScheduledExecutorService cpuMonitorExecutor;
+ /* Thread pool whose size is dynamically managed. */
+ private volatile ExecutorService boundedThreadPool;
+ /* Lock to ensure thread-safe updates to the thread pool. */
+ private final Lock lock = new ReentrantLock();
+ /* New computed max size for the thread pool after adjustment. */
+ private volatile int newMaxPoolSize;
+ /* Logger instance for logging events from WriteThreadPoolSizeManager. */
+ private static final Logger LOG = LoggerFactory.getLogger(
+ WriteThreadPoolSizeManager.class);
+ /* Map to maintain a WriteThreadPoolSizeManager instance per filesystem. */
+ private static final ConcurrentHashMap<String, WriteThreadPoolSizeManager>
+ POOL_SIZE_MANAGER_MAP = new ConcurrentHashMap<>();
+ /* Name of the filesystem associated with this manager. */
+ private final String filesystemName;
+ /* Initial size for the thread pool when created. */
+ private final int initialPoolSize;
+ /* Initially available heap memory. */
+ private final long initialAvailableHeapMemory;
+ /* The configuration instance. */
+ private final AbfsConfiguration abfsConfiguration;
+
+ /**
+ * Private constructor to initialize the write thread pool and CPU monitor
executor
+ * based on system resources and ABFS configuration.
+ *
+ * @param filesystemName Name of the ABFS filesystem.
+ * @param abfsConfiguration Configuration containing pool size parameters.
+ */
+ private WriteThreadPoolSizeManager(String filesystemName,
+ AbfsConfiguration abfsConfiguration) {
+ this.filesystemName = filesystemName;
+ this.abfsConfiguration = abfsConfiguration;
+ int availableProcessors = Runtime.getRuntime().availableProcessors();
+ /* Get the heap space available when the instance is created */
+ this.initialAvailableHeapMemory = getAvailableHeapMemory();
+ /* Compute the max pool size */
+ int computedMaxPoolSize = getComputedMaxPoolSize(availableProcessors,
initialAvailableHeapMemory);
+
+ /* Get the initial pool size from config, fallback to at least 1 */
+ this.initialPoolSize = Math.max(1,
+ abfsConfiguration.getWriteMaxConcurrentRequestCount());
+
+ /* Set the upper bound for the thread pool size */
+ this.maxThreadPoolSize = Math.max(computedMaxPoolSize, initialPoolSize);
+ AtomicInteger threadCount = new AtomicInteger(1);
+ this.boundedThreadPool = Executors.newFixedThreadPool(
Review Comment:
So we are starting with the configured value of writeconcurrentrequestcount
as the initial thread pool size which is also the max until it is scaled
further, the logic for which is present in the adjustThreadPoolBasedOnCpu
> ABFS: Enhance performance of ABFS driver for write-heavy workloads
> ------------------------------------------------------------------
>
> Key: HADOOP-19472
> URL: https://issues.apache.org/jira/browse/HADOOP-19472
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/azure
> Affects Versions: 3.4.1
> Reporter: Anmol Asrani
> Assignee: Anmol Asrani
> Priority: Minor
> Labels: pull-request-available
> Fix For: 3.4.1
>
>
> The goal of this work item is to enhance the performance of ABFS Driver for
> write-heavy workloads by improving concurrency within writes.
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