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Apache ZooKeeper 3.7.0 Server Source Code
Apache ZooKeeper is an open-source server which enables highly
reliable distributed coordination.
Apache ZooKeeper Server Source Code files are provided in the source packge (apache-zookeeper-3.7.0.tar.gz). You can download it at Apache ZooKeeper Website.
You can also browse Apache ZooKeeper Server Source Code below:
✍: FYIcenter.com
⏎ org/apache/zookeeper/server/quorum/LearnerSyncThrottler.java
/* * 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.zookeeper.server.quorum; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * Utility class to limit the number of concurrent syncs from a leader to * observers and followers or from a follower to observers. {@link LearnerHandler} * objects should call {@link #beginSync(boolean)} before sending a sync and * {@link #endSync()} after finishing, successfully or not. * */ public class LearnerSyncThrottler { private static final Logger LOG = LoggerFactory.getLogger(LearnerSyncThrottler.class); private final Object countSyncObject = new Object(); private int syncInProgress; private volatile int maxConcurrentSyncs; public enum SyncType { DIFF, SNAP } private final SyncType syncType; /** * Constructs a new instance limiting the concurrent number of syncs to * <code>maxConcurrentSyncs</code>. * @param maxConcurrentSyncs maximum concurrent number of syncs * @param syncType either a snapshot sync or a txn-based diff sync * @throws java.lang.IllegalArgumentException when <code>maxConcurrentSyncs</code> * is less than 1 */ public LearnerSyncThrottler(int maxConcurrentSyncs, SyncType syncType) throws IllegalArgumentException { if (maxConcurrentSyncs <= 0) { String errorMsg = "maxConcurrentSyncs must be positive, was " + maxConcurrentSyncs; throw new IllegalArgumentException(errorMsg); } this.maxConcurrentSyncs = maxConcurrentSyncs; this.syncType = syncType; synchronized (countSyncObject) { syncInProgress = 0; } } /** * Indicates that a new sync is about to be sent. * * @param essential if <code>true</code>, do not throw an exception even * if throttling limit is reached * @throws SyncThrottleException if throttling limit has been exceeded * and <code>essential == false</code>, * even after waiting for the timeout * period, if any * @throws InterruptedException if thread is interrupted while trying * to start a sync; cannot happen if * timeout is zero */ protected void beginSync(boolean essential) throws SyncThrottleException, InterruptedException { synchronized (countSyncObject) { if (essential || syncInProgress < maxConcurrentSyncs) { syncInProgress++; } else { throw new SyncThrottleException(syncInProgress + 1, maxConcurrentSyncs, syncType); } } } /** * Indicates that a sync has been completed. */ public void endSync() { int newCount; synchronized (countSyncObject) { syncInProgress--; newCount = syncInProgress; countSyncObject.notify(); } if (newCount < 0) { String errorMsg = "endSync() called incorrectly; current sync count is " + newCount; LOG.error(errorMsg); } } public void setMaxConcurrentSyncs(int maxConcurrentSyncs) { this.maxConcurrentSyncs = maxConcurrentSyncs; } public int getSyncInProgress() { return syncInProgress; } }
⏎ org/apache/zookeeper/server/quorum/LearnerSyncThrottler.java
Or download all of them as a single archive file:
File name: zookeeper-server-3.7.0-fyi.zip File size: 871011 bytes Release date: 2021-05-17 Download
⇒ Apache ZooKeeper 3.7.0 Jute Source Code
⇐ Download Apache ZooKeeper 3.7.0 Source Package
2022-11-16, 24657👍, 0💬
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