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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/ObserverRequestProcessor.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.LinkedBlockingQueue; import org.apache.zookeeper.KeeperException; import org.apache.zookeeper.ZooDefs.OpCode; import org.apache.zookeeper.server.Request; import org.apache.zookeeper.server.RequestProcessor; import org.apache.zookeeper.server.ServerMetrics; import org.apache.zookeeper.server.ZooKeeperCriticalThread; import org.apache.zookeeper.server.ZooTrace; import org.apache.zookeeper.txn.ErrorTxn; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * This RequestProcessor forwards any requests that modify the state of the * system to the Leader. */ public class ObserverRequestProcessor extends ZooKeeperCriticalThread implements RequestProcessor { private static final Logger LOG = LoggerFactory.getLogger(ObserverRequestProcessor.class); ObserverZooKeeperServer zks; RequestProcessor nextProcessor; // We keep a queue of requests. As requests get submitted they are // stored here. The queue is drained in the run() method. LinkedBlockingQueue<Request> queuedRequests = new LinkedBlockingQueue<Request>(); boolean finished = false; /** * Constructor - takes an ObserverZooKeeperServer to associate with * and the next processor to pass requests to after we're finished. * @param zks * @param nextProcessor */ public ObserverRequestProcessor(ObserverZooKeeperServer zks, RequestProcessor nextProcessor) { super("ObserverRequestProcessor:" + zks.getServerId(), zks.getZooKeeperServerListener()); this.zks = zks; this.nextProcessor = nextProcessor; } @Override public void run() { try { while (!finished) { ServerMetrics.getMetrics().LEARNER_REQUEST_PROCESSOR_QUEUE_SIZE.add(queuedRequests.size()); Request request = queuedRequests.take(); if (LOG.isTraceEnabled()) { ZooTrace.logRequest(LOG, ZooTrace.CLIENT_REQUEST_TRACE_MASK, 'F', request, ""); } if (request == Request.requestOfDeath) { break; } // Screen quorum requests against ACLs first if (!zks.authWriteRequest(request)) { continue; } // We want to queue the request to be processed before we submit // the request to the leader so that we are ready to receive // the response nextProcessor.processRequest(request); if (request.isThrottled()) { continue; } // We now ship the request to the leader. As with all // other quorum operations, sync also follows this code // path, but different from others, we need to keep track // of the sync operations this Observer has pending, so we // add it to pendingSyncs. switch (request.type) { case OpCode.sync: zks.pendingSyncs.add(request); zks.getObserver().request(request); break; case OpCode.create: case OpCode.create2: case OpCode.createTTL: case OpCode.createContainer: case OpCode.delete: case OpCode.deleteContainer: case OpCode.setData: case OpCode.reconfig: case OpCode.setACL: case OpCode.multi: case OpCode.check: zks.getObserver().request(request); break; case OpCode.createSession: case OpCode.closeSession: // Don't forward local sessions to the leader. if (!request.isLocalSession()) { zks.getObserver().request(request); } break; } } } catch (RuntimeException e) { // spotbugs require explicit catch of RuntimeException handleException(this.getName(), e); } catch (Exception e) { handleException(this.getName(), e); } LOG.info("ObserverRequestProcessor exited loop!"); } /** * Simply queue the request, which will be processed in FIFO order. */ public void processRequest(Request request) { if (!finished) { Request upgradeRequest = null; try { upgradeRequest = zks.checkUpgradeSession(request); } catch (KeeperException ke) { if (request.getHdr() != null) { request.getHdr().setType(OpCode.error); request.setTxn(new ErrorTxn(ke.code().intValue())); } request.setException(ke); LOG.info("Error creating upgrade request", ke); } catch (IOException ie) { LOG.error("Unexpected error in upgrade", ie); } if (upgradeRequest != null) { queuedRequests.add(upgradeRequest); } queuedRequests.add(request); } } /** * Shutdown the processor. */ public void shutdown() { LOG.info("Shutting down"); finished = true; queuedRequests.clear(); queuedRequests.add(Request.requestOfDeath); nextProcessor.shutdown(); } }
⏎ org/apache/zookeeper/server/quorum/ObserverRequestProcessor.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, 13843👍, 0💬
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