Package org.elasticsearch.cluster.routing

Examples of org.elasticsearch.cluster.routing.RoutingNodes

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        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("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();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(1));
        assertThat(routingTable.index("test").shard(0).size(), equalTo(2));
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        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(10));
        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(), equalTo("node1"));
            assertThat(routingTable.index("test").shard(i).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(i).replicaShards().get(0).state(), equalTo(INITIALIZING));
            assertThat(routingTable.index("test").shard(i).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();
        routingNodes = clusterState.routingNodes();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(10));
        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(), equalTo("node1"));
            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(), equalTo("node2"));
        }
        assertThat(routingNodes.node("node1").numberOfShardsWithState(STARTED), equalTo(10));
        assertThat(routingNodes.node("node2").numberOfShardsWithState(STARTED), equalTo(10));

        logger.info("Add 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();
        routingNodes = clusterState.routingNodes();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(10));
        assertThat(routingNodes.node("node1").numberOfShardsWithState(STARTED, RELOCATING), equalTo(10));
        assertThat(routingNodes.node("node1").numberOfShardsWithState(STARTED), lessThan(10));
        assertThat(routingNodes.node("node2").numberOfShardsWithState(STARTED, RELOCATING), equalTo(10));
        assertThat(routingNodes.node("node2").numberOfShardsWithState(STARTED), lessThan(10));
        assertThat(routingNodes.node("node3").numberOfShardsWithState(INITIALIZING), equalTo(6));

        logger.info("Start the shards on node 3");
        routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.node("node3").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(10));
        assertThat(routingNodes.node("node1").numberOfShardsWithState(STARTED), equalTo(8));
        assertThat(routingNodes.node("node2").numberOfShardsWithState(STARTED), equalTo(6));
        assertThat(routingNodes.node("node3").numberOfShardsWithState(STARTED), equalTo(6));
    }
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            assertThat(routingTable.index("test").shard(i).primaryShard().state(), equalTo(INITIALIZING));
            assertThat(routingTable.index("test").shard(i).replicaShards().get(0).state(), equalTo(UNASSIGNED));
        }

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

        for (int i = 0; i < routingTable.index("test").shards().size(); i++) {
            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).replicaShards().get(0).state(), equalTo(INITIALIZING));
        }

        logger.info("now, start 8 more nodes, and check that no rebalancing/relocation have happened");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().putAll(clusterState.nodes())
                .put(newNode("node3")).put(newNode("node4")).put(newNode("node5")).put(newNode("node6")).put(newNode("node7")).put(newNode("node8")).put(newNode("node9")).put(newNode("node10")))
                .build();
        prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();
        routingNodes = clusterState.routingNodes();

        for (int i = 0; i < routingTable.index("test").shards().size(); i++) {
            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).replicaShards().get(0).state(), equalTo(INITIALIZING));
        }

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

        // we only allow one relocation at a time
        assertThat(routingTable.shardsWithState(STARTED).size(), equalTo(5));
        assertThat(routingTable.shardsWithState(RELOCATING).size(), equalTo(5));

        logger.info("complete relocation, other half of relocation should happen");
        routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();
        routingNodes = clusterState.routingNodes();

        // we now only relocate 3, since 2 remain where they are!
        assertThat(routingTable.shardsWithState(STARTED).size(), equalTo(7));
        assertThat(routingTable.shardsWithState(RELOCATING).size(), equalTo(3));

        logger.info("complete relocation, thats it!");
        routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();
        routingNodes = clusterState.routingNodes();

        assertThat(routingTable.shardsWithState(STARTED).size(), equalTo(10));
        // make sure we have an even relocation
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        assertThat(clusterState.readOnlyRoutingNodes().node("node1").numberOfShardsWithState(ShardRoutingState.INITIALIZING), equalTo(2));
        assertThat(clusterState.readOnlyRoutingNodes().node("node2").numberOfShardsWithState(ShardRoutingState.INITIALIZING), equalTo(2));

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

        assertThat(clusterState.readOnlyRoutingNodes().node("node1").numberOfShardsWithState(ShardRoutingState.STARTED), equalTo(2));
        assertThat(clusterState.readOnlyRoutingNodes().node("node1").numberOfShardsWithState(ShardRoutingState.INITIALIZING), equalTo(0));
        assertThat(clusterState.readOnlyRoutingNodes().node("node2").numberOfShardsWithState(ShardRoutingState.STARTED), equalTo(2));
        assertThat(clusterState.readOnlyRoutingNodes().node("node2").numberOfShardsWithState(ShardRoutingState.INITIALIZING), equalTo(0));
        assertThat(clusterState.readOnlyRoutingNodes().unassigned().size(), equalTo(4));

        logger.info("Do another reroute, make sure its still not allocated");
        routingNodes = clusterState.routingNodes();
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();
    }
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        clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder().put(newNode("node1"))).build();
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();

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

        assertThat(numberOfShardsOfType(clusterState.readOnlyRoutingNodes(), STARTED), equalTo(5));

        logger.info("add another index with 5 shards");
        metaData = MetaData.builder(metaData)
                .put(IndexMetaData.builder("test1").settings(settings(Version.CURRENT)
                        .put(IndexMetaData.SETTING_NUMBER_OF_SHARDS, 5)
                        .put(IndexMetaData.SETTING_NUMBER_OF_REPLICAS, 0)
                ))
                .build();
        routingTable = RoutingTable.builder(routingTable)
                .addAsNew(metaData.index("test1"))
                .build();

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

        logger.info("Add another one node and reroute");
        clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder(clusterState.nodes()).put(newNode("node2"))).build();
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();

        routingNodes = clusterState.routingNodes();
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();

        assertThat(numberOfShardsOfType(clusterState.readOnlyRoutingNodes(), STARTED), equalTo(10));

        for (MutableShardRouting shardRouting : clusterState.readOnlyRoutingNodes().node("node1")) {
            assertThat(shardRouting.index(), equalTo("test"));
        }
        for (MutableShardRouting shardRouting : clusterState.readOnlyRoutingNodes().node("node2")) {
            assertThat(shardRouting.index(), equalTo("test1"));
        }

        logger.info("update " + ShardsLimitAllocationDecider.INDEX_TOTAL_SHARDS_PER_NODE + " for test, see that things move");
        metaData = MetaData.builder(metaData)
                .put(IndexMetaData.builder("test").settings(settings(Version.CURRENT)
                        .put(IndexMetaData.SETTING_NUMBER_OF_SHARDS, 5)
                        .put(IndexMetaData.SETTING_NUMBER_OF_REPLICAS, 0)
                        .put(ShardsLimitAllocationDecider.INDEX_TOTAL_SHARDS_PER_NODE, 3)
                ))
                .build();


        clusterState = ClusterState.builder(clusterState).metaData(metaData).build();

        logger.info("reroute after setting");
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();

        assertThat(clusterState.readOnlyRoutingNodes().node("node1").numberOfShardsWithState(STARTED), equalTo(3));
        assertThat(clusterState.readOnlyRoutingNodes().node("node1").numberOfShardsWithState(RELOCATING), equalTo(2));
        assertThat(clusterState.readOnlyRoutingNodes().node("node2").numberOfShardsWithState(RELOCATING), equalTo(2));
        assertThat(clusterState.readOnlyRoutingNodes().node("node2").numberOfShardsWithState(STARTED), equalTo(3));
        // the first move will destroy the balance and the balancer will move 2 shards from node2 to node one right after
        // moving the nodes to node2 since we consider INITIALIZING nodes during rebalance
        routingNodes = clusterState.routingNodes();
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();
        // now we are done compared to EvenShardCountAllocator since the Balancer is not soely based on the average
        assertThat(clusterState.readOnlyRoutingNodes().node("node1").numberOfShardsWithState(STARTED), equalTo(5));
        assertThat(clusterState.readOnlyRoutingNodes().node("node2").numberOfShardsWithState(STARTED), equalTo(5));
    }
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            assertThat(routingTable.index("test2").shard(i).primaryShard().version(), equalTo(1l));
            assertThat(routingTable.index("test2").shard(i).replicaShards().get(0).state(), equalTo(UNASSIGNED));
        }

        logger.info("start all the primary shards for test1, replicas will start initializing");
        RoutingNodes routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState("test1", INITIALIZING)).routingTable();
        clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();
        routingNodes = clusterState.routingNodes();

        for (int i = 0; i < routingTable.index("test1").shards().size(); i++) {
            assertThat(routingTable.index("test1").shard(i).shards().size(), equalTo(2));
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        RoutingTable prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = ClusterState.builder(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 = ClusterState.builder(clusterState).routingTable(routingTable).build();

        logger.info("Start the replica shards");
        routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = ClusterState.builder(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 = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder(clusterState.nodes()).put(newNode("node3"))).build();
        prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
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        clusterState = ClusterState.builder(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 = ClusterState.builder(clusterState).routingTable(routingTable).build();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(10));
        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(), equalTo("node1"));
            assertThat(routingTable.index("test").shard(i).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(i).replicaShards().get(0).state(), equalTo(INITIALIZING));
            assertThat(routingTable.index("test").shard(i).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 = ClusterState.builder(clusterState).routingTable(routingTable).build();
        routingNodes = clusterState.routingNodes();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(10));
        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(), equalTo("node1"));
            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(), equalTo("node2"));
        }
        assertThat(routingNodes.node("node1").numberOfShardsWithState(STARTED), equalTo(10));
        assertThat(routingNodes.node("node2").numberOfShardsWithState(STARTED), equalTo(10));

        logger.info("Add another node and perform rerouting");
        clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder(clusterState.nodes()).put(newNode("node3"))).build();
        prevRoutingTable = routingTable;
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();
        routingNodes = clusterState.routingNodes();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(10));
        assertThat(routingNodes.node("node1").numberOfShardsWithState(STARTED, RELOCATING), equalTo(10));
        assertThat(routingNodes.node("node1").numberOfShardsWithState(STARTED), lessThan(10));
        assertThat(routingNodes.node("node2").numberOfShardsWithState(STARTED, RELOCATING), equalTo(10));
        assertThat(routingNodes.node("node2").numberOfShardsWithState(STARTED), lessThan(10));
        assertThat(routingNodes.node("node3").numberOfShardsWithState(INITIALIZING), equalTo(6));

        logger.info("Start the shards on node 3");
        routingNodes = clusterState.routingNodes();
        prevRoutingTable = routingTable;
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.node("node3").shardsWithState(INITIALIZING)).routingTable();
        clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();
        routingNodes = clusterState.routingNodes();

        assertThat(prevRoutingTable != routingTable, equalTo(true));
        assertThat(routingTable.index("test").shards().size(), equalTo(10));
        assertThat(routingNodes.node("node1").numberOfShardsWithState(STARTED), equalTo(7));
        assertThat(routingNodes.node("node2").numberOfShardsWithState(STARTED), equalTo(7));
        assertThat(routingNodes.node("node3").numberOfShardsWithState(STARTED), equalTo(6));
    }
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        clusterState = ClusterState.builder(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 = ClusterState.builder(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 = ClusterState.builder(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));
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    }

    @Override
    public boolean allocateUnassigned(RoutingAllocation allocation) {
        boolean changed = false;
        RoutingNodes routingNodes = allocation.routingNodes();
        /*
         * 1. order nodes by the number of shards allocated on them least one first (this takes relocation into account)
         *    ie. if a shard is relocating the target nodes shard count is incremented.
         * 2. iterate over the unassigned shards
         *    2a. find the least busy node in the cluster that allows allocation for the current unassigned shard
         *    2b. if a node is found add the shard to the node and remove it from the unassigned shards
         * 3. iterate over the remaining unassigned shards and try to allocate them on next possible node
         */
        // order nodes by number of shards (asc)
        RoutingNode[] nodes = sortedNodesLeastToHigh(allocation);

        Iterator<MutableShardRouting> unassignedIterator = routingNodes.unassigned().iterator();
        int lastNode = 0;

        while (unassignedIterator.hasNext()) {
            MutableShardRouting shard = unassignedIterator.next();
            // do the allocation, finding the least "busy" node
            for (int i = 0; i < nodes.length; i++) {
                RoutingNode node = nodes[lastNode];
                lastNode++;
                if (lastNode == nodes.length) {
                    lastNode = 0;
                }

                Decision decision = allocation.deciders().canAllocate(shard, node, allocation);
                if (decision.type() == Decision.Type.YES) {
                    int numberOfShardsToAllocate = routingNodes.requiredAverageNumberOfShardsPerNode() - node.size();
                    if (numberOfShardsToAllocate <= 0) {
                        continue;
                    }

                    changed = true;
                    allocation.routingNodes().assign(shard, node.nodeId());
                    unassignedIterator.remove();
                    break;
                }
            }
        }

        // allocate all the unassigned shards above the average per node.
        for (Iterator<MutableShardRouting> it = routingNodes.unassigned().iterator(); it.hasNext(); ) {
            MutableShardRouting shard = it.next();
            // go over the nodes and try and allocate the remaining ones
            for (RoutingNode routingNode : sortedNodesLeastToHigh(allocation)) {
                Decision decision = allocation.deciders().canAllocate(shard, routingNode, allocation);
                if (decision.type() == Decision.Type.YES) {
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Related Classes of org.elasticsearch.cluster.routing.RoutingNodes

  • org.elasticsearch.cluster.metadata.IndexMetaData
  • org.elasticsearch.cluster.routing.allocation.AddIncrementallyTests
  • org.elasticsearch.cluster.routing.allocation.allocator.EvenShardsCountAllocator
  • org.elasticsearch.cluster.routing.allocation.ClusterRebalanceRoutingTests
  • org.elasticsearch.cluster.routing.allocation.ConcurrentRebalanceRoutingTests
  • org.elasticsearch.cluster.routing.allocation.ElectReplicaAsPrimaryDuringRelocationTests
  • org.elasticsearch.cluster.routing.allocation.FailedNodeRoutingTests
  • org.elasticsearch.cluster.routing.allocation.FailedShardsRoutingTests
  • org.elasticsearch.cluster.routing.allocation.IndexBalanceTests
  • org.elasticsearch.cluster.routing.allocation.NodeVersionAllocationDeciderTests
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