46 lines
1.7 KiB
Markdown
46 lines
1.7 KiB
Markdown
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Gossip protocol is a method for a group of nodes to discover and check the livelyness of a cluster. More information can be found at http://en.wikipedia.org/wiki/Gossip_protocol.
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The original implementation was forked from https://code.google.com/p/java-gossip/. Several bug fixes and changes have already been added.
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Usage
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-----
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To gossip you need one or more seed nodes. Seed is just a list of places to initially connect to.
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GossipSettings settings = new GossipSettings();
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int seedNodes = 3;
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ArrayList<GossipMember> startupMembers = new ArrayList<GossipMember>();
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for (int i = 1; i < seedNodes+1; ++i) {
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startupMembers.add(new RemoteGossipMember("127.0.0." + i, 2000, i + ""));
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}
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Here we start five gossip processes and check that they discover each other. (Normally these are on different hosts but here we give each process a distinct local ip.
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ArrayList<GossipService> clients = new ArrayList<GossipService>();
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int clusterMembers = 5;
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for (int i = 1; i < clusterMembers+1; ++i) {
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GossipService gossipService = new GossipService("127.0.0." + i, 2000, i + "",
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LogLevel.DEBUG, startupMembers, settings);
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clients.add(gossipService);
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gossipService.start();
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}
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Later we can check that the nodes discover each other
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Thread.sleep(10000);
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for (int i = 0; i < clusterMembers; ++i) {
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Assert.assertEquals(4, clients.get(i).get_gossipManager().getMemberList().size());
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}
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Maven
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------
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You can get this software from maven central.
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<dependency>
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<groupId>io.teknek</groupId>
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<artifactId>gossip</artifactId>
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<version>${pick_the_latest_version}</version>
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</dependency>
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