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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/QuorumZooKeeperServer.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.nio.ByteBuffer; import java.util.Objects; import java.util.function.BiConsumer; import java.util.stream.Collectors; import org.apache.zookeeper.CreateMode; import org.apache.zookeeper.KeeperException; import org.apache.zookeeper.MultiOperationRecord; import org.apache.zookeeper.Op; import org.apache.zookeeper.ZooDefs.OpCode; import org.apache.zookeeper.metrics.MetricsContext; import org.apache.zookeeper.proto.CreateRequest; import org.apache.zookeeper.server.ByteBufferInputStream; import org.apache.zookeeper.server.Request; import org.apache.zookeeper.server.ServerMetrics; import org.apache.zookeeper.server.ZKDatabase; import org.apache.zookeeper.server.ZooKeeperServer; import org.apache.zookeeper.server.persistence.FileTxnSnapLog; /** * Abstract base class for all ZooKeeperServers that participate in * a quorum. */ public abstract class QuorumZooKeeperServer extends ZooKeeperServer { public final QuorumPeer self; protected UpgradeableSessionTracker upgradeableSessionTracker; protected QuorumZooKeeperServer(FileTxnSnapLog logFactory, int tickTime, int minSessionTimeout, int maxSessionTimeout, int listenBacklog, ZKDatabase zkDb, QuorumPeer self) { super(logFactory, tickTime, minSessionTimeout, maxSessionTimeout, listenBacklog, zkDb, self.getInitialConfig(), self.isReconfigEnabled()); this.self = self; } @Override protected void startSessionTracker() { upgradeableSessionTracker = (UpgradeableSessionTracker) sessionTracker; upgradeableSessionTracker.start(); } public Request checkUpgradeSession(Request request) throws IOException, KeeperException { if (request.isThrottled()) { return null; } // If this is a request for a local session and it is to // create an ephemeral node, then upgrade the session and return // a new session request for the leader. // This is called by the request processor thread (either follower // or observer request processor), which is unique to a learner. // So will not be called concurrently by two threads. if ((request.type != OpCode.create && request.type != OpCode.create2 && request.type != OpCode.multi) || !upgradeableSessionTracker.isLocalSession(request.sessionId)) { return null; } if (OpCode.multi == request.type) { MultiOperationRecord multiTransactionRecord = new MultiOperationRecord(); request.request.rewind(); ByteBufferInputStream.byteBuffer2Record(request.request, multiTransactionRecord); request.request.rewind(); boolean containsEphemeralCreate = false; for (Op op : multiTransactionRecord) { if (op.getType() == OpCode.create || op.getType() == OpCode.create2) { CreateRequest createRequest = (CreateRequest) op.toRequestRecord(); CreateMode createMode = CreateMode.fromFlag(createRequest.getFlags()); if (createMode.isEphemeral()) { containsEphemeralCreate = true; break; } } } if (!containsEphemeralCreate) { return null; } } else { CreateRequest createRequest = new CreateRequest(); request.request.rewind(); ByteBufferInputStream.byteBuffer2Record(request.request, createRequest); request.request.rewind(); CreateMode createMode = CreateMode.fromFlag(createRequest.getFlags()); if (!createMode.isEphemeral()) { return null; } } // Uh oh. We need to upgrade before we can proceed. if (!self.isLocalSessionsUpgradingEnabled()) { throw new KeeperException.EphemeralOnLocalSessionException(); } return makeUpgradeRequest(request.sessionId); } private Request makeUpgradeRequest(long sessionId) { // Make sure to atomically check local session status, upgrade // session, and make the session creation request. This is to // avoid another thread upgrading the session in parallel. synchronized (upgradeableSessionTracker) { if (upgradeableSessionTracker.isLocalSession(sessionId)) { int timeout = upgradeableSessionTracker.upgradeSession(sessionId); ByteBuffer to = ByteBuffer.allocate(4); to.putInt(timeout); return new Request(null, sessionId, 0, OpCode.createSession, to, null); } } return null; } /** * Implements the SessionUpgrader interface, * * @param sessionId */ public void upgrade(long sessionId) { Request request = makeUpgradeRequest(sessionId); if (request != null) { LOG.info("Upgrading session 0x{}", Long.toHexString(sessionId)); // This must be a global request submitRequest(request); } } @Override protected void setLocalSessionFlag(Request si) { // We need to set isLocalSession to tree for these type of request // so that the request processor can process them correctly. switch (si.type) { case OpCode.createSession: if (self.areLocalSessionsEnabled()) { // All new sessions local by default. si.setLocalSession(true); } break; case OpCode.closeSession: String reqType = "global"; if (upgradeableSessionTracker.isLocalSession(si.sessionId)) { si.setLocalSession(true); reqType = "local"; } LOG.info("Submitting {} closeSession request for session 0x{}", reqType, Long.toHexString(si.sessionId)); break; default: break; } } @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()); pwriter.println("membership: "); pwriter.print(self.getQuorumVerifier().toString()); } @Override protected void setState(State state) { this.state = state; } @Override protected void registerMetrics() { super.registerMetrics(); MetricsContext rootContext = ServerMetrics.getMetrics().getMetricsProvider().getRootContext(); rootContext.registerGauge("quorum_size", () -> { return self.getQuorumSize(); }); } @Override protected void unregisterMetrics() { super.unregisterMetrics(); MetricsContext rootContext = ServerMetrics.getMetrics().getMetricsProvider().getRootContext(); rootContext.unregisterGauge("quorum_size"); } @Override public void dumpMonitorValues(BiConsumer<String, Object> response) { super.dumpMonitorValues(response); response.accept("peer_state", self.getDetailedPeerState()); } }
⏎ org/apache/zookeeper/server/quorum/QuorumZooKeeperServer.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, 13007👍, 0💬
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