Package org.elasticsearch.cluster

Examples of org.elasticsearch.cluster.ClusterState

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        RoutingTable routingTable = routingTable()
                .add(indexRoutingTable("test").initializeEmpty(metaData.index("test")))
                .build();

        ClusterState clusterState = newClusterStateBuilder().metaData(metaData).routingTable(routingTable).build();

        logger.info("Adding two nodes and performing rerouting");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().put(newNode("node1")).put(newNode("node2"))).build();
        RoutingTable prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        logger.info("Start the primary shards");
        RoutingNodes routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        logger.info("Start the replica shards");
        routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();
        routingNodes = clusterState.routingNodes();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(2));
        assertThat(routingNodes.node("node1").numberOfShardsWithState(STARTED), equalTo(2));
        assertThat(routingNodes.node("node2").numberOfShardsWithState(STARTED), equalTo(2));

        logger.info("Start another node and perform rerouting");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().putAll(clusterState.nodes()).put(newNode("node3"))).build();
        prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        logger.info("find the replica shard that gets relocated");
        IndexShardRoutingTable indexShardRoutingTable = null;
        if (routingTable.index("test").shard(0).replicaShards().get(0).relocating()) {
            indexShardRoutingTable = routingTable.index("test").shard(0);
        } else if (routingTable.index("test").shard(1).replicaShards().get(0).relocating()) {
            indexShardRoutingTable = routingTable.index("test").shard(1);
        }

        assertThat("failed to find relocating replica", indexShardRoutingTable, notNullValue());

        logger.info("kill the node [{}] of the primary shard for the relocating replica", indexShardRoutingTable.primaryShard().currentNodeId());
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().putAll(clusterState.nodes()).remove(indexShardRoutingTable.primaryShard().currentNodeId())).build();
        prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        logger.info("make sure all the primary shards are active");
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        RoutingTable routingTable = routingTable()
                .add(indexRoutingTable("test").initializeEmpty(metaData.index("test")))
                .build();

        ClusterState clusterState = newClusterStateBuilder().metaData(metaData).routingTable(routingTable).build();

        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).shards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).shards().get(0).state(), equalTo(UNASSIGNED));
        assertThat(routingTable.index("test").shard(0).shards().get(1).state(), equalTo(UNASSIGNED));
        assertThat(routingTable.index("test").shard(0).shards().get(0).currentNodeId(), nullValue());
        assertThat(routingTable.index("test").shard(0).shards().get(1).currentNodeId(), nullValue());

        logger.info("Adding one node and performing rerouting");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().put(newNode("node1"))).build();

        RoutingTable prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).shards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).primaryShard().state(), equalTo(INITIALIZING));
        assertThat(routingTable.index("test").shard(0).primaryShard().currentNodeId(), equalTo("node1"));
        assertThat(routingTable.index("test").shard(0).replicaShards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).state(), equalTo(UNASSIGNED));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).currentNodeId(), nullValue());

        logger.info("Add another node and perform rerouting, nothing will happen since primary shards not started");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().putAll(clusterState.nodes()).put(newNode("node2"))).build();
        prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable == routingTable, equalTo(true));

        logger.info("Start the primary shard (on node1)");
        RoutingNodes routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.node("node1").shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).shards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).primaryShard().state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).primaryShard().currentNodeId(), equalTo("node1"));
        assertThat(routingTable.index("test").shard(0).replicaShards().size(), equalTo(1));
        // backup shards are initializing as well, we make sure that they recover from primary *started* shards in the IndicesClusterStateService
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).state(), equalTo(INITIALIZING));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).currentNodeId(), equalTo("node2"));


        logger.info("Reroute, nothing should change");
        prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        assertThat(prevRoutingTable == routingTable, equalTo(true));

        logger.info("Start the backup shard");
        routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.node("node2").shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).shards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).primaryShard().state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).primaryShard().currentNodeId(), equalTo("node1"));
        assertThat(routingTable.index("test").shard(0).replicaShards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).currentNodeId(), equalTo("node2"));

        logger.info("Kill node1, backup shard should become primary");

        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().putAll(clusterState.nodes()).remove("node1")).build();
        prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).shards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).primaryShard().state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).primaryShard().currentNodeId(), equalTo("node2"));
        assertThat(routingTable.index("test").shard(0).replicaShards().size(), equalTo(1));
        // backup shards are initializing as well, we make sure that they recover from primary *started* shards in the IndicesClusterStateService
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).state(), equalTo(UNASSIGNED));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).currentNodeId(), nullValue());

        logger.info("Start another node, backup shard should start initializing");

        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().putAll(clusterState.nodes()).put(newNode("node3"))).build();
        prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
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        RoutingTable routingTable = routingTable()
                .add(indexRoutingTable("test").initializeEmpty(metaData.index("test")))
                .build();

        ClusterState clusterState = newClusterStateBuilder().metaData(metaData).routingTable(routingTable).build();

        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).shards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).shards().get(0).state(), equalTo(UNASSIGNED));
        assertThat(routingTable.index("test").shard(0).shards().get(1).state(), equalTo(UNASSIGNED));
        assertThat(routingTable.index("test").shard(0).shards().get(0).currentNodeId(), nullValue());
        assertThat(routingTable.index("test").shard(0).shards().get(1).currentNodeId(), nullValue());

        logger.info("Adding one node and performing rerouting");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().put(newNode("node1"))).build();

        RoutingTable prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).shards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).primaryShard().state(), equalTo(INITIALIZING));
        assertThat(routingTable.index("test").shard(0).primaryShard().currentNodeId(), equalTo("node1"));
        assertThat(routingTable.index("test").shard(0).replicaShards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).state(), equalTo(UNASSIGNED));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).currentNodeId(), nullValue());

        logger.info("Add another node and perform rerouting, nothing will happen since primary shards not started");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().putAll(clusterState.nodes()).put(newNode("node2"))).build();
        prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable == routingTable, equalTo(true));

        logger.info("Start the primary shard (on node1)");
        RoutingNodes routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.node("node1").shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).shards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).primaryShard().state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).primaryShard().currentNodeId(), equalTo("node1"));
        assertThat(routingTable.index("test").shard(0).replicaShards().size(), equalTo(1));
        // backup shards are initializing as well, we make sure that they recover from primary *started* shards in the IndicesClusterStateService
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).state(), equalTo(INITIALIZING));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).currentNodeId(), equalTo("node2"));


        logger.info("Reroute, nothing should change");
        prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        assertThat(prevRoutingTable == routingTable, equalTo(true));

        logger.info("Start the backup shard");
        routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.node("node2").shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).shards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).primaryShard().state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).primaryShard().currentNodeId(), equalTo("node1"));
        assertThat(routingTable.index("test").shard(0).replicaShards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).currentNodeId(), equalTo("node2"));

        logger.info("Kill node1, backup shard should become primary");

        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().putAll(clusterState.nodes()).remove("node1")).build();
        prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).shards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).primaryShard().state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).primaryShard().currentNodeId(), equalTo("node2"));
        assertThat(routingTable.index("test").shard(0).replicaShards().size(), equalTo(1));
        // backup shards are initializing as well, we make sure that they recover from primary *started* shards in the IndicesClusterStateService
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).state(), equalTo(UNASSIGNED));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).currentNodeId(), nullValue());

        logger.info("Start another node, backup shard should start initializing");

        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().putAll(clusterState.nodes()).put(newNode("node3"))).build();
        prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
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        RoutingTable routingTable = routingTable()
                .add(indexRoutingTable("test").initializeEmpty(metaData.index("test")))
                .build();

        ClusterState clusterState = newClusterStateBuilder().metaData(metaData).routingTable(routingTable).build();

        logger.info("Adding two nodes and performing rerouting");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().put(newNode("node1"))).build();
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        logger.info("Start the primary shard (on node1)");
        RoutingNodes routingNodes = clusterState.routingNodes();
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.node("node1").shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(routingTable.shardsWithState(STARTED).size(), equalTo(5));

        logger.info("start another node, replica will start recovering form primary");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().putAll(clusterState.nodes()).put(newNode("node2"))).build();
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(routingTable.shardsWithState(STARTED).size(), equalTo(5));
        assertThat(routingTable.shardsWithState(INITIALIZING).size(), equalTo(5));

        logger.info("start another node, make sure the primary is not relocated");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().putAll(clusterState.nodes()).put(newNode("node3"))).build();
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(routingTable.shardsWithState(STARTED).size(), equalTo(5));
        assertThat(routingTable.shardsWithState(INITIALIZING).size(), equalTo(5));
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        RoutingTable routingTable = routingTable()
                .add(indexRoutingTable("test").initializeEmpty(metaData.index("test")))
                .build();

        ClusterState clusterState = newClusterStateBuilder().metaData(metaData).routingTable(routingTable).build();

        logger.info("Adding two nodes and performing rerouting");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().put(newNode("node1"))).build();
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        logger.info("Start the primary shard (on node1)");
        RoutingNodes routingNodes = clusterState.routingNodes();
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.node("node1").shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(routingTable.shardsWithState(STARTED).size(), equalTo(5));

        logger.info("start another node, replica will start recovering form primary");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().putAll(clusterState.nodes()).put(newNode("node2"))).build();
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(routingTable.shardsWithState(STARTED).size(), equalTo(5));
        assertThat(routingTable.shardsWithState(INITIALIZING).size(), equalTo(5));

        logger.info("start another node, make sure the primary is not relocated");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().putAll(clusterState.nodes()).put(newNode("node3"))).build();
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(routingTable.shardsWithState(STARTED).size(), equalTo(5));
        assertThat(routingTable.shardsWithState(INITIALIZING).size(), equalTo(5));
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        RoutingTable routingTable = routingTable()
                .add(indexRoutingTable("test").initializeEmpty(metaData.index("test")))
                .build();

        ClusterState clusterState = newClusterStateBuilder().metaData(metaData).routingTable(routingTable).build();

        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).shards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).shards().get(0).state(), equalTo(UNASSIGNED));
        assertThat(routingTable.index("test").shard(0).shards().get(1).state(), equalTo(UNASSIGNED));
        assertThat(routingTable.index("test").shard(0).shards().get(0).currentNodeId(), nullValue());
        assertThat(routingTable.index("test").shard(0).shards().get(1).currentNodeId(), nullValue());


        logger.info("Adding two nodes and performing rerouting");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().put(newNode("node1")).put(newNode("node2"))).build();

        RoutingTable prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        logger.info("Start all the primary shards");
        RoutingNodes routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.node("node1").shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        logger.info("Start all the replica shards");
        routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).shards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).primaryShard().state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).primaryShard().currentNodeId(), equalTo("node1"));
        assertThat(routingTable.index("test").shard(0).replicaShards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).currentNodeId(), equalTo("node2"));

        logger.info("add another replica");
        routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = RoutingTable.builder().routingTable(routingTable).updateNumberOfReplicas(2).build();
        metaData = MetaData.newMetaDataBuilder().metaData(clusterState.metaData()).updateNumberOfReplicas(2).build();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).metaData(metaData).build();

        assertThat(clusterState.metaData().index("test").numberOfReplicas(), equalTo(2));

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(3));
        assertThat(routingTable.index("test").shard(0).primaryShard().state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).primaryShard().currentNodeId(), equalTo("node1"));
        assertThat(routingTable.index("test").shard(0).replicaShards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).currentNodeId(), equalTo("node2"));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(1).state(), equalTo(UNASSIGNED));

        logger.info("Add another node and start the added replica");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().putAll(clusterState.nodes()).put(newNode("node3"))).build();
        prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(3));
        assertThat(routingTable.index("test").shard(0).primaryShard().state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).primaryShard().currentNodeId(), equalTo("node1"));
        assertThat(routingTable.index("test").shard(0).replicaShards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).currentNodeId(), equalTo("node2"));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(1).state(), equalTo(INITIALIZING));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(1).currentNodeId(), equalTo("node3"));

        routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(3));
        assertThat(routingTable.index("test").shard(0).primaryShard().state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).primaryShard().currentNodeId(), equalTo("node1"));
        assertThat(routingTable.index("test").shard(0).replicaShards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).currentNodeId(), equalTo("node2"));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(1).state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(1).currentNodeId(), equalTo("node3"));

        logger.info("now remove a replica");
        routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = RoutingTable.builder().routingTable(routingTable).updateNumberOfReplicas(1).build();
        metaData = MetaData.newMetaDataBuilder().metaData(clusterState.metaData()).updateNumberOfReplicas(1).build();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).metaData(metaData).build();

        assertThat(clusterState.metaData().index("test").numberOfReplicas(), equalTo(1));

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).primaryShard().state(), equalTo(STARTED));
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        RoutingTable routingTable = routingTable()
                .add(indexRoutingTable("test").initializeEmpty(metaData.index("test")))
                .build();

        ClusterState clusterState = newClusterStateBuilder().metaData(metaData).routingTable(routingTable).build();

        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).shards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).shards().get(0).state(), equalTo(UNASSIGNED));
        assertThat(routingTable.index("test").shard(0).shards().get(1).state(), equalTo(UNASSIGNED));
        assertThat(routingTable.index("test").shard(0).shards().get(0).currentNodeId(), nullValue());
        assertThat(routingTable.index("test").shard(0).shards().get(1).currentNodeId(), nullValue());


        logger.info("Adding two nodes and performing rerouting");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().put(newNode("node1")).put(newNode("node2"))).build();

        RoutingTable prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        logger.info("Start all the primary shards");
        RoutingNodes routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.node("node1").shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        logger.info("Start all the replica shards");
        routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).shards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).primaryShard().state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).primaryShard().currentNodeId(), equalTo("node1"));
        assertThat(routingTable.index("test").shard(0).replicaShards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).currentNodeId(), equalTo("node2"));

        logger.info("add another replica");
        routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = RoutingTable.builder().routingTable(routingTable).updateNumberOfReplicas(2).build();
        metaData = MetaData.newMetaDataBuilder().metaData(clusterState.metaData()).updateNumberOfReplicas(2).build();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).metaData(metaData).build();

        assertThat(clusterState.metaData().index("test").numberOfReplicas(), equalTo(2));

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(3));
        assertThat(routingTable.index("test").shard(0).primaryShard().state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).primaryShard().currentNodeId(), equalTo("node1"));
        assertThat(routingTable.index("test").shard(0).replicaShards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).currentNodeId(), equalTo("node2"));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(1).state(), equalTo(UNASSIGNED));

        logger.info("Add another node and start the added replica");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().putAll(clusterState.nodes()).put(newNode("node3"))).build();
        prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(3));
        assertThat(routingTable.index("test").shard(0).primaryShard().state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).primaryShard().currentNodeId(), equalTo("node1"));
        assertThat(routingTable.index("test").shard(0).replicaShards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).currentNodeId(), equalTo("node2"));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(1).state(), equalTo(INITIALIZING));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(1).currentNodeId(), equalTo("node3"));

        routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(3));
        assertThat(routingTable.index("test").shard(0).primaryShard().state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).primaryShard().currentNodeId(), equalTo("node1"));
        assertThat(routingTable.index("test").shard(0).replicaShards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(0).currentNodeId(), equalTo("node2"));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(1).state(), equalTo(STARTED));
        assertThat(routingTable.index("test").shard(0).replicaShards().get(1).currentNodeId(), equalTo("node3"));

        logger.info("now remove a replica");
        routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = RoutingTable.builder().routingTable(routingTable).updateNumberOfReplicas(1).build();
        metaData = MetaData.newMetaDataBuilder().metaData(clusterState.metaData()).updateNumberOfReplicas(1).build();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).metaData(metaData).build();

        assertThat(clusterState.metaData().index("test").numberOfReplicas(), equalTo(1));

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).primaryShard().state(), equalTo(STARTED));
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        RoutingTable routingTable = routingTable()
                .add(indexRoutingTable("test").initializeEmpty(metaData.index("test")))
                .build();

        ClusterState clusterState = newClusterStateBuilder().metaData(metaData).routingTable(routingTable).build();

        logger.info("Adding two nodes and performing rerouting");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().put(newNode("node1")).put(newNode("node2"))).build();
        RoutingTable prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        logger.info("Start the shards (primaries)");
        RoutingNodes routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        for (int i = 0; i < routingTable.index("test").shards().size(); i++) {
            assertThat(routingTable.index("test").shard(i).size(), equalTo(2));
            assertThat(routingTable.index("test").shard(i).shards().size(), equalTo(2));
            assertThat(routingTable.index("test").shard(i).primaryShard().state(), equalTo(STARTED));
            assertThat(routingTable.index("test").shard(i).primaryShard().currentNodeId(), anyOf(equalTo("node1"), equalTo("node2")));
            assertThat(routingTable.index("test").shard(i).replicaShards().size(), equalTo(1));
            assertThat(routingTable.index("test").shard(i).replicaShards().get(0).state(), equalTo(INITIALIZING));
            assertThat(routingTable.index("test").shard(i).replicaShards().get(0).currentNodeId(), anyOf(equalTo("node2"), equalTo("node1")));
        }

        logger.info("Start the shards (backups)");
        routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        for (int i = 0; i < routingTable.index("test").shards().size(); i++) {
            assertThat(routingTable.index("test").shard(i).size(), equalTo(2));
            assertThat(routingTable.index("test").shard(i).shards().size(), equalTo(2));
            assertThat(routingTable.index("test").shard(i).primaryShard().state(), equalTo(STARTED));
            assertThat(routingTable.index("test").shard(i).primaryShard().currentNodeId(), anyOf(equalTo("node1"), equalTo("node2")));
            assertThat(routingTable.index("test").shard(i).replicaShards().size(), equalTo(1));
            assertThat(routingTable.index("test").shard(i).replicaShards().get(0).state(), equalTo(STARTED));
            assertThat(routingTable.index("test").shard(i).replicaShards().get(0).currentNodeId(), anyOf(equalTo("node2"), equalTo("node1")));
        }

        logger.info("fail the primary shard, will have no place to be rerouted to (single node), so stays unassigned");
        ShardRouting shardToFail = new ImmutableShardRouting(routingTable.index("test").shard(0).primaryShard());
        prevRoutingTable = routingTable;
        routingTable = strategy.applyFailedShard(clusterState, shardToFail).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();
        routingNodes = clusterState.routingNodes();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).shards().size(), equalTo(2));
        assertThat(routingTable.index("test").shard(0).primaryShard().currentNodeId(), not(equalTo(shardToFail.currentNodeId())));
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        RoutingTable routingTable = routingTable()
                .add(indexRoutingTable("test").initializeEmpty(metaData.index("test")))
                .build();

        ClusterState clusterState = newClusterStateBuilder().metaData(metaData).routingTable(routingTable).build();

        logger.info("Adding single node and performing rerouting");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().put(newNode("node1"))).build();
        RoutingTable prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        for (int i = 0; i < routingTable.index("test").shards().size(); i++) {
            assertThat(routingTable.index("test").shard(i).size(), equalTo(2));
            assertThat(routingTable.index("test").shard(i).shards().size(), equalTo(2));
            assertThat(routingTable.index("test").shard(i).primaryShard().state(), equalTo(INITIALIZING));
            assertThat(routingTable.index("test").shard(i).primaryShard().currentNodeId(), equalTo("node1"));
            assertThat(routingTable.index("test").shard(i).replicaShards().size(), equalTo(1));
            assertThat(routingTable.index("test").shard(i).replicaShards().get(0).state(), equalTo(UNASSIGNED));
        }

        logger.info("fail the first shard, will have no place to be rerouted to (single node), so stays unassigned");
        prevRoutingTable = routingTable;
        routingTable = strategy.applyFailedShard(clusterState, new ImmutableShardRouting("test", 0, "node1", true, INITIALIZING, 0)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();
        RoutingNodes routingNodes = clusterState.routingNodes();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        for (int i = 0; i < routingTable.index("test").shards().size(); i++) {
            assertThat(routingTable.index("test").shard(i).size(), equalTo(2));
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        RoutingTable routingTable = routingTable()
                .add(indexRoutingTable("test").initializeEmpty(metaData.index("test")))
                .build();

        ClusterState clusterState = newClusterStateBuilder().metaData(metaData).routingTable(routingTable).build();

        logger.info("Adding two nodes and performing rerouting");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().put(newNode("node1")).put(newNode("node2"))).build();
        RoutingTable prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        for (int i = 0; i < routingTable.index("test").shards().size(); i++) {
            assertThat(routingTable.index("test").shard(i).size(), equalTo(2));
            assertThat(routingTable.index("test").shard(i).shards().size(), equalTo(2));
            assertThat(routingTable.index("test").shard(i).primaryShard().state(), equalTo(INITIALIZING));
            assertThat(routingTable.index("test").shard(i).primaryShard().currentNodeId(), equalTo("node1"));
            assertThat(routingTable.index("test").shard(i).replicaShards().size(), equalTo(1));
            assertThat(routingTable.index("test").shard(i).replicaShards().get(0).state(), equalTo(UNASSIGNED));
        }

        logger.info("fail the first shard, will start INITIALIZING on the second node");
        prevRoutingTable = routingTable;
        routingTable = strategy.applyFailedShard(clusterState, new ImmutableShardRouting("test", 0, "node1", true, INITIALIZING, 0)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();
        RoutingNodes routingNodes = clusterState.routingNodes();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        for (int i = 0; i < routingTable.index("test").shards().size(); i++) {
            assertThat(routingTable.index("test").shard(i).size(), equalTo(2));
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