ElectReplicaAsPrimaryDuringRelocationTests.java example

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package org.elasticsearch.cluster.routing.allocation;

import org.apache.logging.log4j.Logger;
import org.elasticsearch.Version;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.ESAllocationTestCase;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.cluster.metadata.MetaData;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.cluster.routing.IndexShardRoutingTable;
import org.elasticsearch.cluster.routing.RoutingNodes;
import org.elasticsearch.cluster.routing.RoutingTable;
import org.elasticsearch.common.logging.Loggers;
import org.elasticsearch.common.settings.Settings;

import static org.elasticsearch.cluster.routing.ShardRoutingState.INITIALIZING;
import static org.elasticsearch.cluster.routing.ShardRoutingState.STARTED;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.not;

public class ElectReplicaAsPrimaryDuringRelocationTests extends ESAllocationTestCase {
    private final Logger logger = Loggers.getLogger(ElectReplicaAsPrimaryDuringRelocationTests.class);

    public void testElectReplicaAsPrimaryDuringRelocation() {
        AllocationService strategy = createAllocationService(Settings.builder().put("cluster.routing.allocation.node_concurrent_recoveries", 10).build());

        logger.info("Building initial routing table");

        MetaData metaData = MetaData.builder()
                .put(IndexMetaData.builder("test").settings(settings(Version.CURRENT)).numberOfShards(2).numberOfReplicas(1))
                .build();

        RoutingTable initialRoutingTable = RoutingTable.builder()
                .addAsNew(metaData.index("test"))
                .build();

        ClusterState clusterState = ClusterState.builder(org.elasticsearch.cluster.ClusterName.CLUSTER_NAME_SETTING.getDefault(Settings.EMPTY)).metaData(metaData).routingTable(initialRoutingTable).build();

        logger.info("Adding two nodes and performing rerouting");
        clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder().add(newNode("node1")).add(newNode("node2"))).build();
        clusterState = strategy.reroute(clusterState, "reroute");

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

        logger.info("Start the replica shards");
        routingNodes = clusterState.getRoutingNodes();
        ClusterState resultingState = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING));
        assertThat(resultingState, not(equalTo(clusterState)));
        clusterState = resultingState;

        routingNodes = clusterState.getRoutingNodes();
        assertThat(clusterState.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()).add(newNode("node3"))).build();
        clusterState = strategy.reroute(clusterState, "reroute");

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

        // we might have primary relocating, and the test is only for replicas, so only test in the case of replica allocation
        if (indexShardRoutingTable != null) {
            logger.info("kill the node [{}] of the primary shard for the relocating replica", indexShardRoutingTable.primaryShard().currentNodeId());
            clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder(clusterState.nodes()).remove(indexShardRoutingTable.primaryShard().currentNodeId())).build();
            clusterState = strategy.deassociateDeadNodes(clusterState, true, "reroute");

            logger.info("make sure all the primary shards are active");
            assertThat(clusterState.routingTable().index("test").shard(0).primaryShard().active(), equalTo(true));
            assertThat(clusterState.routingTable().index("test").shard(1).primaryShard().active(), equalTo(true));
        }
    }
}