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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.cluster.routing;
import org.elasticsearch.Version;
import org.elasticsearch.cluster.ClusterChangedEvent;
import org.elasticsearch.cluster.ClusterName;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.cluster.metadata.MetaData;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.cluster.routing.allocation.AllocationService;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.test.ESAllocationTestCase;
import org.elasticsearch.test.cluster.TestClusterService;
import org.elasticsearch.threadpool.ThreadPool;
import org.junit.After;
import org.junit.Before;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicBoolean;
import static java.util.Collections.singletonMap;
import static org.elasticsearch.cluster.routing.ShardRoutingState.INITIALIZING;
import static org.elasticsearch.cluster.routing.ShardRoutingState.STARTED;
import static org.hamcrest.Matchers.equalTo;
/**
*/
public class RoutingServiceTests extends ESAllocationTestCase {
private TestRoutingService routingService;
@Before
public void createRoutingService() {
routingService = new TestRoutingService();
}
@After
public void shutdownRoutingService() throws Exception {
routingService.shutdown();
}
public void testReroute() {
assertThat(routingService.hasReroutedAndClear(), equalTo(false));
routingService.reroute("test");
assertThat(routingService.hasReroutedAndClear(), equalTo(true));
}
public void testNoDelayedUnassigned() throws Exception {
AllocationService allocation = createAllocationService(Settings.EMPTY, new DelayedShardsMockGatewayAllocator());
MetaData metaData = MetaData.builder()
.put(IndexMetaData.builder("test").settings(settings(Version.CURRENT).put(UnassignedInfo.INDEX_DELAYED_NODE_LEFT_TIMEOUT_SETTING.getKey(), "0"))
.numberOfShards(1).numberOfReplicas(1))
.build();
ClusterState clusterState = ClusterState.builder(ClusterName.DEFAULT)
.metaData(metaData)
.routingTable(RoutingTable.builder().addAsNew(metaData.index("test")).build()).build();
clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder().put(newNode("node1")).put(newNode("node2")).localNodeId("node1").masterNodeId("node1")).build();
clusterState = ClusterState.builder(clusterState).routingResult(allocation.reroute(clusterState, "reroute")).build();
// starting primaries
clusterState = ClusterState.builder(clusterState).routingResult(allocation.applyStartedShards(clusterState, clusterState.getRoutingNodes().shardsWithState(INITIALIZING))).build();
// starting replicas
clusterState = ClusterState.builder(clusterState).routingResult(allocation.applyStartedShards(clusterState, clusterState.getRoutingNodes().shardsWithState(INITIALIZING))).build();
assertThat(clusterState.getRoutingNodes().unassigned().size() > 0, equalTo(false));
// remove node2 and reroute
ClusterState prevState = clusterState;
clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder(clusterState.nodes()).remove("node2")).build();
clusterState = ClusterState.builder(clusterState).routingResult(allocation.reroute(clusterState, "reroute")).build();
ClusterState newState = clusterState;
assertThat(routingService.getMinDelaySettingAtLastSchedulingNanos(), equalTo(Long.MAX_VALUE));
routingService.clusterChanged(new ClusterChangedEvent("test", newState, prevState));
assertThat(routingService.getMinDelaySettingAtLastSchedulingNanos(), equalTo(Long.MAX_VALUE));
assertThat(routingService.hasReroutedAndClear(), equalTo(false));
}
public void testDelayedUnassignedScheduleReroute() throws Exception {
MockAllocationService allocation = createAllocationService(Settings.EMPTY, new DelayedShardsMockGatewayAllocator());
MetaData metaData = MetaData.builder()
.put(IndexMetaData.builder("test").settings(settings(Version.CURRENT).put(UnassignedInfo.INDEX_DELAYED_NODE_LEFT_TIMEOUT_SETTING.getKey(), "100ms"))
.numberOfShards(1).numberOfReplicas(1))
.build();
ClusterState clusterState = ClusterState.builder(ClusterName.DEFAULT)
.metaData(metaData)
.routingTable(RoutingTable.builder().addAsNew(metaData.index("test")).build()).build();
clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder().put(newNode("node1")).put(newNode("node2")).localNodeId("node1").masterNodeId("node1")).build();
clusterState = ClusterState.builder(clusterState).routingResult(allocation.reroute(clusterState, "reroute")).build();
// starting primaries
clusterState = ClusterState.builder(clusterState).routingResult(allocation.applyStartedShards(clusterState, clusterState.getRoutingNodes().shardsWithState(INITIALIZING))).build();
// starting replicas
clusterState = ClusterState.builder(clusterState).routingResult(allocation.applyStartedShards(clusterState, clusterState.getRoutingNodes().shardsWithState(INITIALIZING))).build();
assertFalse("no shards should be unassigned", clusterState.getRoutingNodes().unassigned().size() > 0);
String nodeId = null;
final List<ShardRouting> allShards = clusterState.getRoutingNodes().routingTable().allShards("test");
// we need to find the node with the replica otherwise we will not reroute
for (ShardRouting shardRouting : allShards) {
if (shardRouting.primary() == false) {
nodeId = shardRouting.currentNodeId();
break;
}
}
assertNotNull(nodeId);
// remove nodeId and reroute
ClusterState prevState = clusterState;
clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder(clusterState.nodes()).remove(nodeId)).build();
// make sure the replica is marked as delayed (i.e. not reallocated)
clusterState = ClusterState.builder(clusterState).routingResult(allocation.reroute(clusterState, "reroute")).build();
assertEquals(1, clusterState.getRoutingNodes().unassigned().size());
ClusterState newState = clusterState;
routingService.clusterChanged(new ClusterChangedEvent("test", newState, prevState));
assertBusy(() -> assertTrue("routing service should have run a reroute", routingService.hasReroutedAndClear()));
// verify the registration has been reset
assertThat(routingService.getMinDelaySettingAtLastSchedulingNanos(), equalTo(Long.MAX_VALUE));
}
/**
* This tests that a new delayed reroute is scheduled right after a delayed reroute was run
*/
public void testDelayedUnassignedScheduleRerouteAfterDelayedReroute() throws Exception {
final ThreadPool testThreadPool = new ThreadPool(getTestName());
try {
MockAllocationService allocation = createAllocationService(Settings.EMPTY, new DelayedShardsMockGatewayAllocator());
MetaData metaData = MetaData.builder()
.put(IndexMetaData.builder("short_delay").settings(settings(Version.CURRENT).put(UnassignedInfo.INDEX_DELAYED_NODE_LEFT_TIMEOUT_SETTING.getKey(), "100ms"))
.numberOfShards(1).numberOfReplicas(1))
.put(IndexMetaData.builder("long_delay").settings(settings(Version.CURRENT).put(UnassignedInfo.INDEX_DELAYED_NODE_LEFT_TIMEOUT_SETTING.getKey(), "10s"))
.numberOfShards(1).numberOfReplicas(1))
.build();
ClusterState clusterState = ClusterState.builder(ClusterName.DEFAULT).metaData(metaData)
.routingTable(RoutingTable.builder().addAsNew(metaData.index("short_delay")).addAsNew(metaData.index("long_delay")).build())
.nodes(DiscoveryNodes.builder()
.put(newNode("node0", singletonMap("data", Boolean.FALSE.toString()))).localNodeId("node0").masterNodeId("node0")
.put(newNode("node1")).put(newNode("node2")).put(newNode("node3")).put(newNode("node4"))).build();
// allocate shards
clusterState = ClusterState.builder(clusterState).routingResult(allocation.reroute(clusterState, "reroute")).build();
// start primaries
clusterState = ClusterState.builder(clusterState).routingResult(allocation.applyStartedShards(clusterState, clusterState.getRoutingNodes().shardsWithState(INITIALIZING))).build();
// start replicas
clusterState = ClusterState.builder(clusterState).routingResult(allocation.applyStartedShards(clusterState, clusterState.getRoutingNodes().shardsWithState(INITIALIZING))).build();
assertThat("all shards should be started", clusterState.getRoutingNodes().shardsWithState(STARTED).size(), equalTo(4));
// find replica of short_delay
ShardRouting shortDelayReplica = null;
for (ShardRouting shardRouting : clusterState.getRoutingNodes().routingTable().allShards("short_delay")) {
if (shardRouting.primary() == false) {
shortDelayReplica = shardRouting;
break;
}
}
assertNotNull(shortDelayReplica);
// find replica of long_delay
ShardRouting longDelayReplica = null;
for (ShardRouting shardRouting : clusterState.getRoutingNodes().routingTable().allShards("long_delay")) {
if (shardRouting.primary() == false) {
longDelayReplica = shardRouting;
break;
}
}
assertNotNull(longDelayReplica);
final long baseTime = System.nanoTime();
// remove node of shortDelayReplica and node of longDelayReplica and reroute
ClusterState prevState = clusterState;
clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder(clusterState.nodes()).remove(shortDelayReplica.currentNodeId()).remove(longDelayReplica.currentNodeId())).build();
// make sure both replicas are marked as delayed (i.e. not reallocated)
allocation.setNanoTimeOverride(baseTime);
clusterState = ClusterState.builder(clusterState).routingResult(allocation.reroute(clusterState, "reroute")).build();
// check that shortDelayReplica and longDelayReplica have been marked unassigned
RoutingNodes.UnassignedShards unassigned = clusterState.getRoutingNodes().unassigned();
assertEquals(2, unassigned.size());
// update shortDelayReplica and longDelayReplica variables with new shard routing
ShardRouting shortDelayUnassignedReplica = null;
ShardRouting longDelayUnassignedReplica = null;
for (ShardRouting shr : unassigned) {
if (shr.getIndex().equals("short_delay")) {
shortDelayUnassignedReplica = shr;
} else {
longDelayUnassignedReplica = shr;
}
}
assertTrue(shortDelayReplica.isSameShard(shortDelayUnassignedReplica));
assertTrue(longDelayReplica.isSameShard(longDelayUnassignedReplica));
// manually trigger a clusterChanged event on routingService
ClusterState newState = clusterState;
// create fake cluster service
TestClusterService clusterService = new TestClusterService(newState, testThreadPool);
// create routing service, also registers listener on cluster service
RoutingService routingService = new RoutingService(Settings.EMPTY, testThreadPool, clusterService, allocation);
routingService.start(); // just so performReroute does not prematurely return
// next (delayed) reroute should only delay longDelayReplica/longDelayUnassignedReplica, simulate that we are now 1 second after shards became unassigned
allocation.setNanoTimeOverride(baseTime + TimeValue.timeValueSeconds(1).nanos());
// register listener on cluster state so we know when cluster state has been changed
CountDownLatch latch = new CountDownLatch(1);
clusterService.addLast(event -> latch.countDown());
// instead of clusterService calling clusterChanged, we call it directly here
routingService.clusterChanged(new ClusterChangedEvent("test", newState, prevState));
// cluster service should have updated state and called routingService with clusterChanged
latch.await();
// verify the registration has been set to the delay of longDelayReplica/longDelayUnassignedReplica
assertThat(routingService.getMinDelaySettingAtLastSchedulingNanos(), equalTo(TimeValue.timeValueSeconds(10).nanos()));
} finally {
terminate(testThreadPool);
}
}
private class TestRoutingService extends RoutingService {
private AtomicBoolean rerouted = new AtomicBoolean();
public TestRoutingService() {
super(Settings.EMPTY, new ThreadPool(getTestName()), null, null);
}
void shutdown() throws Exception {
terminate(threadPool);
}
public boolean hasReroutedAndClear() {
return rerouted.getAndSet(false);
}
@Override
protected void performReroute(String reason) {
logger.info("--> performing fake reroute [{}]", reason);
rerouted.set(true);
}
}
}
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