Examples with RoutingExplanations org.elasticsearch.cluster.routing.allocation.RoutingExplanations used on opensource projects

Example 1 with RoutingExplanations

use of org.elasticsearch.cluster.routing.allocation.RoutingExplanations in project elasticsearch by elastic.

the class ClusterRerouteIT method testRerouteExplain.

public void testRerouteExplain() {
    Settings commonSettings = Settings.builder().build();
    logger.info("--> starting a node");
    String node_1 = internalCluster().startNode(commonSettings);
    assertThat(cluster().size(), equalTo(1));
    ClusterHealthResponse healthResponse = client().admin().cluster().prepareHealth().setWaitForNodes("1").execute().actionGet();
    assertThat(healthResponse.isTimedOut(), equalTo(false));
    logger.info("--> create an index with 1 shard");
    client().admin().indices().prepareCreate("test").setSettings(Settings.builder().put("index.number_of_shards", 1).put("index.number_of_replicas", 0)).execute().actionGet();
    ensureGreen("test");
    logger.info("--> disable allocation");
    Settings newSettings = Settings.builder().put(CLUSTER_ROUTING_ALLOCATION_ENABLE_SETTING.getKey(), Allocation.NONE.name()).build();
    client().admin().cluster().prepareUpdateSettings().setTransientSettings(newSettings).execute().actionGet();
    logger.info("--> starting a second node");
    String node_2 = internalCluster().startNode(commonSettings);
    assertThat(cluster().size(), equalTo(2));
    healthResponse = client().admin().cluster().prepareHealth().setWaitForNodes("2").execute().actionGet();
    assertThat(healthResponse.isTimedOut(), equalTo(false));
    logger.info("--> try to move the shard from node1 to node2");
    MoveAllocationCommand cmd = new MoveAllocationCommand("test", 0, node_1, node_2);
    ClusterRerouteResponse resp = client().admin().cluster().prepareReroute().add(cmd).setExplain(true).execute().actionGet();
    RoutingExplanations e = resp.getExplanations();
    assertThat(e.explanations().size(), equalTo(1));
    RerouteExplanation explanation = e.explanations().get(0);
    assertThat(explanation.command().name(), equalTo(cmd.name()));
    assertThat(((MoveAllocationCommand) explanation.command()).shardId(), equalTo(cmd.shardId()));
    assertThat(((MoveAllocationCommand) explanation.command()).fromNode(), equalTo(cmd.fromNode()));
    assertThat(((MoveAllocationCommand) explanation.command()).toNode(), equalTo(cmd.toNode()));
    assertThat(explanation.decisions().type(), equalTo(Decision.Type.YES));
}