@Test
public void testClusterRerouteNoAcknowledgementDryRun() throws InterruptedException {
client()
.admin()
.indices()
.prepareCreate("test")
.setSettings(
settingsBuilder()
.put(
SETTING_NUMBER_OF_SHARDS,
between(cluster().numDataNodes(), DEFAULT_MAX_NUM_SHARDS))
.put(SETTING_NUMBER_OF_REPLICAS, 0))
.get();
ensureGreen();
MoveAllocationCommand moveAllocationCommand = getAllocationCommand();
ClusterRerouteResponse clusterRerouteResponse =
client()
.admin()
.cluster()
.prepareReroute()
.setTimeout("0s")
.setDryRun(true)
.add(moveAllocationCommand)
.get();
// acknowledged anyway as no changes were made
assertThat(clusterRerouteResponse.isAcknowledged(), equalTo(true));
}
@Test
public void rerouteExplain() {
Settings commonSettings = settingsBuilder().build();
logger.info("--> starting a node");
String node_1 = cluster().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(
settingsBuilder().put("index.number_of_shards", 1).put("index.number_of_replicas", 0))
.execute()
.actionGet();
ensureGreen("test");
logger.info("--> disable allocation");
Settings newSettings =
settingsBuilder()
.put(
EnableAllocationDecider.CLUSTER_ROUTING_ALLOCATION_ENABLE,
EnableAllocationDecider.Allocation.NONE.name())
.build();
client()
.admin()
.cluster()
.prepareUpdateSettings()
.setTransientSettings(newSettings)
.execute()
.actionGet();
logger.info("--> starting a second node");
String node_2 = cluster().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(new ShardId("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));
}