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https://issues.apache.org/jira/browse/HADOOP-19120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17832100#comment-17832100
]
ASF GitHub Bot commented on HADOOP-19120:
-----------------------------------------
saxenapranav commented on code in PR #6633:
URL: https://github.com/apache/hadoop/pull/6633#discussion_r1544253009
##########
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/services/AbfsConnectionManager.java:
##########
@@ -0,0 +1,162 @@
+/**
+ * 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.services;
+
+import java.io.IOException;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.hadoop.fs.azurebfs.services.kac.KeepAliveCache;
+import org.apache.http.HttpClientConnection;
+import org.apache.http.config.Registry;
+import org.apache.http.config.SocketConfig;
+import org.apache.http.conn.ConnectionPoolTimeoutException;
+import org.apache.http.conn.ConnectionRequest;
+import org.apache.http.conn.HttpClientConnectionManager;
+import org.apache.http.conn.HttpClientConnectionOperator;
+import org.apache.http.conn.routing.HttpRoute;
+import org.apache.http.conn.socket.ConnectionSocketFactory;
+import org.apache.http.impl.conn.DefaultHttpClientConnectionOperator;
+import org.apache.http.impl.conn.ManagedHttpClientConnectionFactory;
+import org.apache.http.protocol.HttpContext;
+import org.apache.http.util.Asserts;
+
+/**
+ * AbfsConnectionManager is a custom implementation of {@link
HttpClientConnectionManager}.
+ * This implementation manages connection-pooling heuristics and custom
implementation
+ * of {@link ManagedHttpClientConnectionFactory}.
+ */
+public class AbfsConnectionManager implements HttpClientConnectionManager {
+
+ private final KeepAliveCache kac = KeepAliveCache.getInstance();
+
+ private final AbfsConnFactory httpConnectionFactory;
+
+ private final HttpClientConnectionOperator connectionOperator;
+
+ public AbfsConnectionManager(Registry<ConnectionSocketFactory>
socketFactoryRegistry,
+ AbfsConnFactory connectionFactory) {
+ this.httpConnectionFactory = connectionFactory;
+ connectionOperator = new DefaultHttpClientConnectionOperator(
+ socketFactoryRegistry, null, null);
+ }
+
+ @Override
+ public ConnectionRequest requestConnection(final HttpRoute route,
+ final Object state) {
+ return new ConnectionRequest() {
+ @Override
+ public HttpClientConnection get(final long timeout,
+ final TimeUnit timeUnit)
+ throws InterruptedException, ExecutionException,
+ ConnectionPoolTimeoutException {
+ try {
+ HttpClientConnection client = kac.get(route);
+ if (client != null && client.isOpen()) {
Review Comment:
Very good point!
This would get checked though internally in MainClientExec, but better
prevent earlier.
Would be taken!
> [ABFS]: ApacheHttpClient adaptation as network library
> ------------------------------------------------------
>
> Key: HADOOP-19120
> URL: https://issues.apache.org/jira/browse/HADOOP-19120
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/azure
> Affects Versions: 3.5.0
> Reporter: Pranav Saxena
> Assignee: Pranav Saxena
> Priority: Major
> Labels: pull-request-available
>
> Apache HttpClient is more feature-rich and flexible and gives application
> more granular control over networking parameter.
> ABFS currently relies on the JDK-net library. This library is managed by
> OpenJDK and has no performance problem. However, it limits the application's
> control over networking, and there are very few APIs and hooks exposed that
> the application can use to get metrics, choose which and when a connection
> should be reused. ApacheHttpClient will give important hooks to fetch
> important metrics and control networking parameters.
> A custom implementation of connection-pool is used. The implementation is
> adapted from the JDK8 connection pooling. Reasons for doing it:
> 1. PoolingHttpClientConnectionManager heuristic caches all the reusable
> connections it has created. JDK's implementation only caches limited number
> of connections. The limit is given by JVM system property
> "http.maxConnections". If there is no system-property, it defaults to 5.
> Connection-establishment latency increased with all the connections were
> cached. Hence, adapting the pooling heuristic of JDK netlib,
> 2. In PoolingHttpClientConnectionManager, it expects the application to
> provide `setMaxPerRoute` and `setMaxTotal`, which the implementation uses as
> the total number of connections it can create. For application using ABFS, it
> is not feasible to provide a value in the initialisation of the
> connectionManager. JDK's implementation has no cap on the number of
> connections it can have opened on a moment. Hence, adapting the pooling
> heuristic of JDK netlib,
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