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Apache ZooKeeper 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 package file, apache-zookeeper-3.8.0.tar.gz.
You can download apache-zookeeper-3.8.0.tar.gz as described in the previous tutorial and go to the "zookeeper-server" sub-folder to view Apache ZooKeeper Server Source Code files.
You can also browse Apache ZooKeeper Server Source Code below:
✍: FYIcenter.com
⏎ org/apache/zookeeper/server/quorum/ObserverZooKeeperServer.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 java.io.IOException; import java.util.concurrent.ConcurrentLinkedQueue; import java.util.function.BiConsumer; import org.apache.zookeeper.server.FinalRequestProcessor; import org.apache.zookeeper.server.Request; import org.apache.zookeeper.server.RequestProcessor; import org.apache.zookeeper.server.SyncRequestProcessor; import org.apache.zookeeper.server.ZKDatabase; import org.apache.zookeeper.server.persistence.FileTxnSnapLog; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * A ZooKeeperServer for the Observer node type. Not much is different, but * we anticipate specializing the request processors in the future. * */ public class ObserverZooKeeperServer extends LearnerZooKeeperServer { private static final Logger LOG = LoggerFactory.getLogger(ObserverZooKeeperServer.class); /** * Enable since request processor for writing txnlog to disk and * take periodic snapshot. Default is ON. */ private boolean syncRequestProcessorEnabled = this.self.getSyncEnabled(); /* * Pending sync requests */ ConcurrentLinkedQueue<Request> pendingSyncs = new ConcurrentLinkedQueue<Request>(); ObserverZooKeeperServer(FileTxnSnapLog logFactory, QuorumPeer self, ZKDatabase zkDb) throws IOException { super(logFactory, self.tickTime, self.minSessionTimeout, self.maxSessionTimeout, self.clientPortListenBacklog, zkDb, self); LOG.info("syncEnabled ={}", syncRequestProcessorEnabled); } public Observer getObserver() { return self.observer; } @Override public Learner getLearner() { return self.observer; } /** * Unlike a Follower, which sees a full request only during the PROPOSAL * phase, Observers get all the data required with the INFORM packet. * This method commits a request that has been unpacked by from an INFORM * received from the Leader. * * @param request */ public void commitRequest(Request request) { if (syncRequestProcessorEnabled) { // Write to txnlog and take periodic snapshot syncProcessor.processRequest(request); } commitProcessor.commit(request); } /** * Set up the request processors for an Observer: * firstProcesor->commitProcessor->finalProcessor */ @Override protected void setupRequestProcessors() { // We might consider changing the processor behaviour of // Observers to, for example, remove the disk sync requirements. // Currently, they behave almost exactly the same as followers. RequestProcessor finalProcessor = new FinalRequestProcessor(this); commitProcessor = new CommitProcessor(finalProcessor, Long.toString(getServerId()), true, getZooKeeperServerListener()); commitProcessor.start(); firstProcessor = new ObserverRequestProcessor(this, commitProcessor); ((ObserverRequestProcessor) firstProcessor).start(); /* * Observer should write to disk, so that the it won't request * too old txn from the leader which may lead to getting an entire * snapshot. * * However, this may degrade performance as it has to write to disk * and do periodic snapshot which may double the memory requirements */ if (syncRequestProcessorEnabled) { syncProcessor = new SyncRequestProcessor(this, null); syncProcessor.start(); } } /* * Process a sync request */ public synchronized void sync() { if (pendingSyncs.size() == 0) { LOG.warn("Not expecting a sync."); return; } Request r = pendingSyncs.remove(); commitProcessor.commit(r); } @Override public String getState() { return "observer"; } @Override public synchronized void shutdown() { if (!canShutdown()) { LOG.debug("ZooKeeper server is not running, so not proceeding to shutdown!"); return; } super.shutdown(); if (syncRequestProcessorEnabled && syncProcessor != null) { syncProcessor.shutdown(); } } @Override public void dumpMonitorValues(BiConsumer<String, Object> response) { super.dumpMonitorValues(response); response.accept("observer_master_id", getObserver().getLearnerMasterId()); } }
⏎ org/apache/zookeeper/server/quorum/ObserverZooKeeperServer.java
Or download all of them as a single archive file:
File name: zookeeper-server-3.8.0-fyi.zip File size: 885581 bytes Release date: 2022-02-25 Download
⇒ Apache ZooKeeper Jute Source Code
⇐ Download and Install Apache ZooKeeper Source Package
2022-11-16, 13141👍, 0💬
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