109 lines
4.0 KiB
Java
109 lines
4.0 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Copyright 2015 Cloudius Systems
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*
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* Modified by Cloudius Systems
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*/
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package org.apache.cassandra.gms;
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import java.lang.management.ManagementFactory;
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import java.net.UnknownHostException;
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import javax.management.MBeanServer;
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import javax.management.ObjectName;
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import javax.ws.rs.core.MultivaluedHashMap;
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import javax.ws.rs.core.MultivaluedMap;
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import com.scylladb.jmx.api.APIClient;
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/**
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* This module is responsible for Gossiping information for the local endpoint.
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* This abstraction maintains the list of live and dead endpoints. Periodically
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* i.e. every 1 second this module chooses a random node and initiates a round
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* of Gossip with it. A round of Gossip involves 3 rounds of messaging. For
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* instance if node A wants to initiate a round of Gossip with node B it starts
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* off by sending node B a GossipDigestSynMessage. Node B on receipt of this
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* message sends node A a GossipDigestAckMessage. On receipt of this message
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* node A sends node B a GossipDigestAck2Message which completes a round of
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* Gossip. This module as and when it hears one of the three above mentioned
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* messages updates the Failure Detector with the liveness information. Upon
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* hearing a GossipShutdownMessage, this module will instantly mark the remote
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* node as down in the Failure Detector.
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*/
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public class Gossiper implements GossiperMBean {
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public static final String MBEAN_NAME = "org.apache.cassandra.net:type=Gossiper";
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private static final java.util.logging.Logger logger = java.util.logging.Logger
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.getLogger(Gossiper.class.getName());
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private APIClient c = new APIClient();
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public void log(String str) {
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logger.finest(str);
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}
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private static final Gossiper instance = new Gossiper();
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public static Gossiper getInstance() {
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return instance;
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}
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private Gossiper() {
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// Register this instance with JMX
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try {
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MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
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mbs.registerMBean(this, new ObjectName(MBEAN_NAME));
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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@Override
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public long getEndpointDowntime(String address) throws UnknownHostException {
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log(" getEndpointDowntime(String address) throws UnknownHostException");
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return c.getLongValue("gossiper/downtime/" + address);
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}
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@Override
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public int getCurrentGenerationNumber(String address)
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throws UnknownHostException {
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log(" getCurrentGenerationNumber(String address) throws UnknownHostException");
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return c.getIntValue("gossiper/generation_number/" + address);
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}
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@Override
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public void unsafeAssassinateEndpoint(String address)
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throws UnknownHostException {
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log(" unsafeAssassinateEndpoint(String address) throws UnknownHostException");
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MultivaluedMap<String, String> queryParams = new MultivaluedHashMap<String, String>();
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queryParams.add("unsafe", "True");
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c.post("gossiper/assassinate/" + address, queryParams);
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}
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@Override
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public void assassinateEndpoint(String address) throws UnknownHostException {
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log(" assassinateEndpoint(String address) throws UnknownHostException");
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c.post("gossiper/assassinate/" + address, null);
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}
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}
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