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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/ReadOnlyZooKeeperServer.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.io.PrintWriter; import java.util.Objects; import java.util.stream.Collectors; import org.apache.zookeeper.ZooDefs.OpCode; import org.apache.zookeeper.jmx.MBeanRegistry; import org.apache.zookeeper.server.DataTreeBean; import org.apache.zookeeper.server.FinalRequestProcessor; import org.apache.zookeeper.server.PrepRequestProcessor; import org.apache.zookeeper.server.Request; import org.apache.zookeeper.server.RequestProcessor; import org.apache.zookeeper.server.ServerCnxn; import org.apache.zookeeper.server.ZKDatabase; import org.apache.zookeeper.server.ZooKeeperServer; import org.apache.zookeeper.server.ZooKeeperServerBean; import org.apache.zookeeper.server.persistence.FileTxnSnapLog; /** * A ZooKeeperServer which comes into play when peer is partitioned from the * majority. Handles read-only clients, but drops connections from not-read-only * ones. * <p> * The very first processor in the chain of request processors is a * ReadOnlyRequestProcessor which drops state-changing requests. */ public class ReadOnlyZooKeeperServer extends ZooKeeperServer { protected final QuorumPeer self; private volatile boolean shutdown = false; ReadOnlyZooKeeperServer(FileTxnSnapLog logFactory, QuorumPeer self, ZKDatabase zkDb) { super( logFactory, self.tickTime, self.minSessionTimeout, self.maxSessionTimeout, self.clientPortListenBacklog, zkDb, self.getInitialConfig(), self.isReconfigEnabled()); this.self = self; } @Override protected void setupRequestProcessors() { RequestProcessor finalProcessor = new FinalRequestProcessor(this); RequestProcessor prepProcessor = new PrepRequestProcessor(this, finalProcessor); ((PrepRequestProcessor) prepProcessor).start(); firstProcessor = new ReadOnlyRequestProcessor(this, prepProcessor); ((ReadOnlyRequestProcessor) firstProcessor).start(); } @Override public synchronized void startup() { // check to avoid startup follows shutdown if (shutdown) { LOG.warn("Not starting Read-only server as startup follows shutdown!"); return; } registerJMX(new ReadOnlyBean(this), self.jmxLocalPeerBean); super.startup(); self.setZooKeeperServer(this); self.adminServer.setZooKeeperServer(this); LOG.info("Read-only server started"); } @Override public void createSessionTracker() { sessionTracker = new LearnerSessionTracker( this, getZKDatabase().getSessionWithTimeOuts(), this.tickTime, self.getId(), self.areLocalSessionsEnabled(), getZooKeeperServerListener()); } @Override protected void startSessionTracker() { ((LearnerSessionTracker) sessionTracker).start(); } @Override protected void setLocalSessionFlag(Request si) { switch (si.type) { case OpCode.createSession: if (self.areLocalSessionsEnabled()) { si.setLocalSession(true); } break; case OpCode.closeSession: if (((UpgradeableSessionTracker) sessionTracker).isLocalSession(si.sessionId)) { si.setLocalSession(true); } else { LOG.warn("Submitting global closeSession request for session 0x{} in ReadOnly mode", Long.toHexString(si.sessionId)); } break; default: break; } } @Override protected void validateSession(ServerCnxn cnxn, long sessionId) throws IOException { if (((LearnerSessionTracker) sessionTracker).isGlobalSession(sessionId)) { String msg = "Refusing global session reconnection in RO mode " + cnxn.getRemoteSocketAddress(); LOG.info(msg); throw new ServerCnxn.CloseRequestException(msg, ServerCnxn.DisconnectReason.RENEW_GLOBAL_SESSION_IN_RO_MODE); } } @Override protected void registerJMX() { // register with JMX try { jmxDataTreeBean = new DataTreeBean(getZKDatabase().getDataTree()); MBeanRegistry.getInstance().register(jmxDataTreeBean, jmxServerBean); } catch (Exception e) { LOG.warn("Failed to register with JMX", e); jmxDataTreeBean = null; } } public void registerJMX(ZooKeeperServerBean serverBean, LocalPeerBean localPeerBean) { // register with JMX try { jmxServerBean = serverBean; MBeanRegistry.getInstance().register(serverBean, localPeerBean); } catch (Exception e) { LOG.warn("Failed to register with JMX", e); jmxServerBean = null; } } @Override protected void unregisterJMX() { // unregister from JMX try { if (jmxDataTreeBean != null) { MBeanRegistry.getInstance().unregister(jmxDataTreeBean); } } catch (Exception e) { LOG.warn("Failed to unregister with JMX", e); } jmxDataTreeBean = null; } protected void unregisterJMX(ZooKeeperServer zks) { // unregister from JMX try { if (jmxServerBean != null) { MBeanRegistry.getInstance().unregister(jmxServerBean); } } catch (Exception e) { LOG.warn("Failed to unregister with JMX", e); } jmxServerBean = null; } @Override public String getState() { return "read-only"; } /** * Returns the id of the associated QuorumPeer, which will do for a unique * id of this server. */ @Override public long getServerId() { return self.getId(); } @Override public synchronized void shutdown() { if (!canShutdown()) { LOG.debug("ZooKeeper server is not running, so not proceeding to shutdown!"); return; } shutdown = true; unregisterJMX(this); // set peer's server to null self.setZooKeeperServer(null); // clear all the connections self.closeAllConnections(); self.adminServer.setZooKeeperServer(null); // shutdown the server itself super.shutdown(); } @Override public void dumpConf(PrintWriter pwriter) { super.dumpConf(pwriter); pwriter.print("initLimit="); pwriter.println(self.getInitLimit()); pwriter.print("syncLimit="); pwriter.println(self.getSyncLimit()); pwriter.print("electionAlg="); pwriter.println(self.getElectionType()); pwriter.print("electionPort="); pwriter.println(self.getElectionAddress().getAllPorts() .stream().map(Objects::toString).collect(Collectors.joining("|"))); pwriter.print("quorumPort="); pwriter.println(self.getQuorumAddress().getAllPorts() .stream().map(Objects::toString).collect(Collectors.joining("|"))); pwriter.print("peerType="); pwriter.println(self.getLearnerType().ordinal()); } @Override protected void setState(State state) { this.state = state; } }
⏎ org/apache/zookeeper/server/quorum/ReadOnlyZooKeeperServer.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, 24680👍, 0💬
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