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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/flexible/QuorumMaj.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.flexible; import java.util.HashMap; import java.util.Map; import java.util.Map.Entry; import java.util.Properties; import java.util.Set; import org.apache.zookeeper.server.quorum.QuorumPeer.LearnerType; import org.apache.zookeeper.server.quorum.QuorumPeer.QuorumServer; import org.apache.zookeeper.server.quorum.QuorumPeerConfig.ConfigException; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * This class implements a validator for majority quorums. The implementation is * straightforward. * */ public class QuorumMaj implements QuorumVerifier { private static final Logger LOG = LoggerFactory.getLogger(QuorumMaj.class); private Map<Long, QuorumServer> allMembers = new HashMap<Long, QuorumServer>(); private Map<Long, QuorumServer> votingMembers = new HashMap<Long, QuorumServer>(); private Map<Long, QuorumServer> observingMembers = new HashMap<Long, QuorumServer>(); private long version = 0; protected int half; public int hashCode() { assert false : "hashCode not designed"; return 42; // any arbitrary constant will do } public boolean equals(Object o) { if (!(o instanceof QuorumMaj)) { return false; } QuorumMaj qm = (QuorumMaj) o; if (qm.getVersion() == version) { return true; } if (allMembers.size() != qm.getAllMembers().size()) { return false; } for (QuorumServer qs : allMembers.values()) { QuorumServer qso = qm.getAllMembers().get(qs.id); if (qso == null || !qs.equals(qso)) { return false; } } return true; } /** * Defines a majority to avoid computing it every time. * */ public QuorumMaj(Map<Long, QuorumServer> allMembers) { this.allMembers = allMembers; for (QuorumServer qs : allMembers.values()) { if (qs.type == LearnerType.PARTICIPANT) { votingMembers.put(Long.valueOf(qs.id), qs); } else { observingMembers.put(Long.valueOf(qs.id), qs); } } half = votingMembers.size() / 2; } public QuorumMaj(Properties props) throws ConfigException { for (Entry<Object, Object> entry : props.entrySet()) { String key = entry.getKey().toString(); String value = entry.getValue().toString(); if (key.startsWith("server.")) { int dot = key.indexOf('.'); long sid = Long.parseLong(key.substring(dot + 1)); QuorumServer qs = new QuorumServer(sid, value); allMembers.put(Long.valueOf(sid), qs); if (qs.type == LearnerType.PARTICIPANT) { votingMembers.put(Long.valueOf(sid), qs); } else { observingMembers.put(Long.valueOf(sid), qs); } } else if (key.equals("version")) { version = Long.parseLong(value, 16); } } half = votingMembers.size() / 2; } /** * Returns weight of 1 by default. * * @param id */ public long getWeight(long id) { return 1; } public String toString() { StringBuilder sw = new StringBuilder(); for (QuorumServer member : getAllMembers().values()) { String key = "server." + member.id; String value = member.toString(); sw.append(key); sw.append('='); sw.append(value); sw.append('\n'); } String hexVersion = Long.toHexString(version); sw.append("version="); sw.append(hexVersion); return sw.toString(); } /** * Verifies if a set is a majority. Assumes that ackSet contains acks only * from votingMembers */ public boolean containsQuorum(Set<Long> ackSet) { return (ackSet.size() > half); } public Map<Long, QuorumServer> getAllMembers() { return allMembers; } public Map<Long, QuorumServer> getVotingMembers() { return votingMembers; } public Map<Long, QuorumServer> getObservingMembers() { return observingMembers; } public long getVersion() { return version; } public void setVersion(long ver) { version = ver; } }
⏎ org/apache/zookeeper/server/quorum/flexible/QuorumMaj.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, 13008👍, 0💬
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