Examples of com.splout.db.hazelcast.DistributedRegistry

com.splout.db.hazelcast.DistributedRegistry
Creates a registry of members using a {@link IMap}. The user can create a {@link EntryListener} forreceiving events from the IMap wich inform of joining or leaving members. Some update events can be generated, because of change in the information, or as cause of some re-registerings that are done for safety.
Main difficulty with the registry is the case of network partitions, or split-brain. In this case, all registry replicas of one member could be lost. It is an improbable case, but possible. For this case, we have a thread that periodically check that the node is registered so assuring eventual consistency.
Another design principle of this registry is the idea of trying to minimize network communication between nodes, as that could affect the system scalability.

  @Override
  public void giveGreenLigth() {
    int minutesToCheckRegister = config.getInt(HazelcastProperties.MAX_TIME_TO_CHECK_REGISTRATION, 5);
    int oldestMembersLeading = config.getInt(HazelcastProperties.OLDEST_MEMBERS_LEADING_COUNT, 3);


    dnodesRegistry = new DistributedRegistry(CoordinationStructures.DNODES, new DNodeInfo(config), hz,
        minutesToCheckRegister, oldestMembersLeading);
    dnodesRegistry.register();
  }

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      // Assert that this DNode is registered for failover
      HazelcastInstance hz = Hazelcast.newHazelcastInstance(HazelcastConfigBuilder.build(testConfig));
      final CoordinationStructures coord = new CoordinationStructures(hz);
      // We need to implement the {@link com.splout.db.hazelcast.DistributedRegistry} for members to be
      // automatically removed from the DNODES map
      new DistributedRegistry(CoordinationStructures.DNODES, new DNodeInfo(testConfig), hz, 10, 3);


      new TestUtils.NotWaitingForeverCondition() {
        @Override
        public boolean endCondition() {
          boolean registered = false;

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Related Classes of com.splout.db.hazelcast.DistributedRegistry

com.splout.db.dnode.DNodeHandler

com.splout.db.dnode.TestDNodeHZ

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