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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/FollowerZooKeeperServer.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.concurrent.LinkedBlockingQueue; import javax.management.JMException; import org.apache.jute.Record; import org.apache.zookeeper.jmx.MBeanRegistry; import org.apache.zookeeper.metrics.MetricsContext; import org.apache.zookeeper.server.ExitCode; import org.apache.zookeeper.server.FinalRequestProcessor; import org.apache.zookeeper.server.Request; import org.apache.zookeeper.server.RequestProcessor; import org.apache.zookeeper.server.ServerMetrics; import org.apache.zookeeper.server.SyncRequestProcessor; import org.apache.zookeeper.server.ZKDatabase; import org.apache.zookeeper.server.persistence.FileTxnSnapLog; import org.apache.zookeeper.txn.TxnDigest; import org.apache.zookeeper.txn.TxnHeader; import org.apache.zookeeper.util.ServiceUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * Just like the standard ZooKeeperServer. We just replace the request * processors: FollowerRequestProcessor -> CommitProcessor -> * FinalRequestProcessor * * A SyncRequestProcessor is also spawned off to log proposals from the leader. */ public class FollowerZooKeeperServer extends LearnerZooKeeperServer { private static final Logger LOG = LoggerFactory.getLogger(FollowerZooKeeperServer.class); /* * Pending sync requests */ ConcurrentLinkedQueue<Request> pendingSyncs; /** * @throws IOException */ FollowerZooKeeperServer(FileTxnSnapLog logFactory, QuorumPeer self, ZKDatabase zkDb) throws IOException { super(logFactory, self.tickTime, self.minSessionTimeout, self.maxSessionTimeout, self.clientPortListenBacklog, zkDb, self); this.pendingSyncs = new ConcurrentLinkedQueue<Request>(); } public Follower getFollower() { return self.follower; } @Override protected void setupRequestProcessors() { RequestProcessor finalProcessor = new FinalRequestProcessor(this); commitProcessor = new CommitProcessor(finalProcessor, Long.toString(getServerId()), true, getZooKeeperServerListener()); commitProcessor.start(); firstProcessor = new FollowerRequestProcessor(this, commitProcessor); ((FollowerRequestProcessor) firstProcessor).start(); syncProcessor = new SyncRequestProcessor(this, new SendAckRequestProcessor(getFollower())); syncProcessor.start(); } LinkedBlockingQueue<Request> pendingTxns = new LinkedBlockingQueue<Request>(); public void logRequest(TxnHeader hdr, Record txn, TxnDigest digest) { Request request = new Request(hdr.getClientId(), hdr.getCxid(), hdr.getType(), hdr, txn, hdr.getZxid()); request.setTxnDigest(digest); if ((request.zxid & 0xffffffffL) != 0) { pendingTxns.add(request); } syncProcessor.processRequest(request); } /** * When a COMMIT message is received, eventually this method is called, * which matches up the zxid from the COMMIT with (hopefully) the head of * the pendingTxns queue and hands it to the commitProcessor to commit. * @param zxid - must correspond to the head of pendingTxns if it exists */ public void commit(long zxid) { if (pendingTxns.size() == 0) { LOG.warn("Committing " + Long.toHexString(zxid) + " without seeing txn"); return; } long firstElementZxid = pendingTxns.element().zxid; if (firstElementZxid != zxid) { LOG.error("Committing zxid 0x" + Long.toHexString(zxid) + " but next pending txn 0x" + Long.toHexString(firstElementZxid)); ServiceUtils.requestSystemExit(ExitCode.UNMATCHED_TXN_COMMIT.getValue()); } Request request = pendingTxns.remove(); request.logLatency(ServerMetrics.getMetrics().COMMIT_PROPAGATION_LATENCY); commitProcessor.commit(request); } public synchronized void sync() { if (pendingSyncs.size() == 0) { LOG.warn("Not expecting a sync."); return; } Request r = pendingSyncs.remove(); if (r instanceof LearnerSyncRequest) { LearnerSyncRequest lsr = (LearnerSyncRequest) r; lsr.fh.queuePacket(new QuorumPacket(Leader.SYNC, 0, null, null)); } commitProcessor.commit(r); } @Override public int getGlobalOutstandingLimit() { int divisor = self.getQuorumSize() > 2 ? self.getQuorumSize() - 1 : 1; int globalOutstandingLimit = super.getGlobalOutstandingLimit() / divisor; return globalOutstandingLimit; } @Override public String getState() { return "follower"; } @Override public Learner getLearner() { return getFollower(); } /** * Process a request received from external Learner through the LearnerMaster * These requests have already passed through validation and checks for * session upgrade and can be injected into the middle of the pipeline. * * @param request received from external Learner */ void processObserverRequest(Request request) { ((FollowerRequestProcessor) firstProcessor).processRequest(request, false); } boolean registerJMX(LearnerHandlerBean handlerBean) { try { MBeanRegistry.getInstance().register(handlerBean, jmxServerBean); return true; } catch (JMException e) { LOG.warn("Could not register connection", e); } return false; } @Override protected void registerMetrics() { super.registerMetrics(); MetricsContext rootContext = ServerMetrics.getMetrics().getMetricsProvider().getRootContext(); rootContext.registerGauge("synced_observers", self::getSynced_observers_metric); } @Override protected void unregisterMetrics() { super.unregisterMetrics(); MetricsContext rootContext = ServerMetrics.getMetrics().getMetricsProvider().getRootContext(); rootContext.unregisterGauge("synced_observers"); } }
⏎ org/apache/zookeeper/server/quorum/FollowerZooKeeperServer.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, 24654👍, 0💬
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