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* the Apache License, Version 2.0 (the "License"); you may
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* 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
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package org.elasticsearch.cluster.routing.allocation;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.Version;
import org.elasticsearch.cluster.ClusterInfo;
import org.elasticsearch.cluster.ClusterInfoService;
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.RoutingNode;
import org.elasticsearch.cluster.routing.RoutingNodes;
import org.elasticsearch.cluster.routing.RoutingTable;
import org.elasticsearch.cluster.routing.ShardRouting;
import org.elasticsearch.cluster.routing.allocation.decider.ClusterRebalanceAllocationDecider;
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.RELOCATING;
import static org.elasticsearch.cluster.routing.ShardRoutingState.STARTED;
import static org.elasticsearch.cluster.routing.ShardRoutingState.UNASSIGNED;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.nullValue;
public class RebalanceAfterActiveTests extends ESAllocationTestCase {
private final Logger logger = Loggers.getLogger(RebalanceAfterActiveTests.class);
public void testRebalanceOnlyAfterAllShardsAreActive() {
final long[] sizes = new long[5];
for (int i =0; i < sizes.length; i++) {
sizes[i] = randomIntBetween(0, Integer.MAX_VALUE);
}
AllocationService strategy = createAllocationService(Settings.builder()
.put("cluster.routing.allocation.node_concurrent_recoveries", 10)
.put(ClusterRebalanceAllocationDecider.CLUSTER_ROUTING_ALLOCATION_ALLOW_REBALANCE_SETTING.getKey(), "always")
.put("cluster.routing.allocation.cluster_concurrent_rebalance", -1)
.build(),
new ClusterInfoService() {
@Override
public ClusterInfo getClusterInfo() {
return new ClusterInfo() {
@Override
public Long getShardSize(ShardRouting shardRouting) {
if (shardRouting.getIndexName().equals("test")) {
return sizes[shardRouting.getId()];
}
return null; }
};
}
@Override
public void addListener(Listener listener) {
}
});
logger.info("Building initial routing table");
MetaData metaData = MetaData.builder()
.put(IndexMetaData.builder("test").settings(settings(Version.CURRENT)).numberOfShards(5).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();
assertThat(clusterState.routingTable().index("test").shards().size(), equalTo(5));
for (int i = 0; i < clusterState.routingTable().index("test").shards().size(); i++) {
assertThat(clusterState.routingTable().index("test").shard(i).shards().size(), equalTo(2));
assertThat(clusterState.routingTable().index("test").shard(i).shards().get(0).state(), equalTo(UNASSIGNED));
assertThat(clusterState.routingTable().index("test").shard(i).shards().get(1).state(), equalTo(UNASSIGNED));
assertThat(clusterState.routingTable().index("test").shard(i).shards().get(0).currentNodeId(), nullValue());
assertThat(clusterState.routingTable().index("test").shard(i).shards().get(1).currentNodeId(), nullValue());
}
logger.info("start two nodes and fully start the shards");
clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder().add(newNode("node1")).add(newNode("node2"))).build();
clusterState = strategy.reroute(clusterState, "reroute");
for (int i = 0; i < clusterState.routingTable().index("test").shards().size(); i++) {
assertThat(clusterState.routingTable().index("test").shard(i).shards().size(), equalTo(2));
assertThat(clusterState.routingTable().index("test").shard(i).primaryShard().state(), equalTo(INITIALIZING));
assertThat(clusterState.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.getRoutingNodes();
clusterState = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING));
routingNodes = clusterState.getRoutingNodes();
for (int i = 0; i < clusterState.routingTable().index("test").shards().size(); i++) {
assertThat(clusterState.routingTable().index("test").shard(i).shards().size(), equalTo(2));
assertThat(clusterState.routingTable().index("test").shard(i).primaryShard().state(), equalTo(STARTED));
assertThat(clusterState.routingTable().index("test").shard(i).replicaShards().get(0).state(), equalTo(INITIALIZING));
assertEquals(clusterState.routingTable().index("test").shard(i).replicaShards().get(0).getExpectedShardSize(), sizes[i]);
}
logger.info("now, start 8 more nodes, and check that no rebalancing/relocation have happened");
clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder(clusterState.nodes())
.add(newNode("node3")).add(newNode("node4")).add(newNode("node5")).add(newNode("node6")).add(newNode("node7")).add(newNode("node8")).add(newNode("node9")).add(newNode("node10")))
.build();
clusterState = strategy.reroute(clusterState, "reroute");
routingNodes = clusterState.getRoutingNodes();
for (int i = 0; i < clusterState.routingTable().index("test").shards().size(); i++) {
assertThat(clusterState.routingTable().index("test").shard(i).shards().size(), equalTo(2));
assertThat(clusterState.routingTable().index("test").shard(i).primaryShard().state(), equalTo(STARTED));
assertThat(clusterState.routingTable().index("test").shard(i).replicaShards().get(0).state(), equalTo(INITIALIZING));
assertEquals(clusterState.routingTable().index("test").shard(i).replicaShards().get(0).getExpectedShardSize(), sizes[i]);
}
logger.info("start the replica shards, rebalancing should start");
routingNodes = clusterState.getRoutingNodes();
clusterState = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING));
routingNodes = clusterState.getRoutingNodes();
// we only allow one relocation at a time
assertThat(clusterState.routingTable().shardsWithState(STARTED).size(), equalTo(5));
assertThat(clusterState.routingTable().shardsWithState(RELOCATING).size(), equalTo(5));
for (int i = 0; i < clusterState.routingTable().index("test").shards().size(); i++) {
int num = 0;
for (ShardRouting routing : clusterState.routingTable().index("test").shard(i).shards()) {
if (routing.state() == RELOCATING || routing.state() == INITIALIZING) {
assertEquals(routing.getExpectedShardSize(), sizes[i]);
num++;
}
}
assertTrue(num > 0);
}
logger.info("complete relocation, other half of relocation should happen");
routingNodes = clusterState.getRoutingNodes();
clusterState = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING));
routingNodes = clusterState.getRoutingNodes();
// we now only relocate 3, since 2 remain where they are!
assertThat(clusterState.routingTable().shardsWithState(STARTED).size(), equalTo(7));
assertThat(clusterState.routingTable().shardsWithState(RELOCATING).size(), equalTo(3));
for (int i = 0; i < clusterState.routingTable().index("test").shards().size(); i++) {
for (ShardRouting routing : clusterState.routingTable().index("test").shard(i).shards()) {
if (routing.state() == RELOCATING || routing.state() == INITIALIZING) {
assertEquals(routing.getExpectedShardSize(), sizes[i]);
}
}
}
logger.info("complete relocation, that's it!");
routingNodes = clusterState.getRoutingNodes();
clusterState = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING));
routingNodes = clusterState.getRoutingNodes();
assertThat(clusterState.routingTable().shardsWithState(STARTED).size(), equalTo(10));
// make sure we have an even relocation
for (RoutingNode routingNode : routingNodes) {
assertThat(routingNode.size(), equalTo(1));
}
}
}