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* ownership. Elasticsearch licenses this file to you under
* 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.structure;
import org.elasticsearch.Version;
import org.elasticsearch.cluster.ClusterName;
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.GroupShardsIterator;
import org.elasticsearch.cluster.routing.OperationRouting;
import org.elasticsearch.cluster.routing.PlainShardIterator;
import org.elasticsearch.cluster.routing.RotationShardShuffler;
import org.elasticsearch.cluster.routing.RoutingTable;
import org.elasticsearch.cluster.routing.ShardIterator;
import org.elasticsearch.cluster.routing.ShardRouting;
import org.elasticsearch.cluster.routing.ShardShuffler;
import org.elasticsearch.cluster.routing.ShardsIterator;
import org.elasticsearch.cluster.routing.allocation.AllocationService;
import org.elasticsearch.cluster.routing.allocation.decider.ClusterRebalanceAllocationDecider;
import org.elasticsearch.common.settings.ClusterSettings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.shard.ShardId;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import static java.util.Collections.singletonMap;
import static java.util.Collections.unmodifiableMap;
import static org.elasticsearch.cluster.routing.ShardRoutingState.INITIALIZING;
import static org.hamcrest.Matchers.anyOf;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.not;
import static org.hamcrest.Matchers.notNullValue;
import static org.hamcrest.Matchers.nullValue;
import static org.hamcrest.Matchers.sameInstance;
public class RoutingIteratorTests extends ESAllocationTestCase {
public void testEmptyIterator() {
ShardShuffler shuffler = new RotationShardShuffler(0);
ShardIterator shardIterator = new PlainShardIterator(new ShardId("test1", "_na_", 0), shuffler.shuffle(Collections.<ShardRouting>emptyList()));
assertThat(shardIterator.remaining(), equalTo(0));
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardIterator.remaining(), equalTo(0));
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardIterator.remaining(), equalTo(0));
shardIterator = new PlainShardIterator(new ShardId("test1", "_na_", 0), shuffler.shuffle(Collections.<ShardRouting>emptyList()));
assertThat(shardIterator.remaining(), equalTo(0));
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardIterator.remaining(), equalTo(0));
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardIterator.remaining(), equalTo(0));
shardIterator = new PlainShardIterator(new ShardId("test1", "_na_", 0), shuffler.shuffle(Collections.<ShardRouting>emptyList()));
assertThat(shardIterator.remaining(), equalTo(0));
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardIterator.remaining(), equalTo(0));
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardIterator.remaining(), equalTo(0));
shardIterator = new PlainShardIterator(new ShardId("test1", "_na_", 0), shuffler.shuffle(Collections.<ShardRouting>emptyList()));
assertThat(shardIterator.remaining(), equalTo(0));
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardIterator.remaining(), equalTo(0));
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardIterator.remaining(), equalTo(0));
}
public void testIterator1() {
MetaData metaData = MetaData.builder()
.put(IndexMetaData.builder("test1").settings(settings(Version.CURRENT)).numberOfShards(1).numberOfReplicas(2))
.build();
RoutingTable routingTable = RoutingTable.builder()
.addAsNew(metaData.index("test1"))
.build();
ShardIterator shardIterator = routingTable.index("test1").shard(0).shardsIt(0);
assertThat(shardIterator.size(), equalTo(3));
ShardRouting shardRouting1 = shardIterator.nextOrNull();
assertThat(shardRouting1, notNullValue());
assertThat(shardIterator.remaining(), equalTo(2));
ShardRouting shardRouting2 = shardIterator.nextOrNull();
assertThat(shardRouting2, notNullValue());
assertThat(shardIterator.remaining(), equalTo(1));
assertThat(shardRouting2, not(sameInstance(shardRouting1)));
ShardRouting shardRouting3 = shardIterator.nextOrNull();
assertThat(shardRouting3, notNullValue());
assertThat(shardRouting3, not(sameInstance(shardRouting1)));
assertThat(shardRouting3, not(sameInstance(shardRouting2)));
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardIterator.remaining(), equalTo(0));
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardIterator.remaining(), equalTo(0));
}
public void testIterator2() {
MetaData metaData = MetaData.builder()
.put(IndexMetaData.builder("test1").settings(settings(Version.CURRENT)).numberOfShards(1).numberOfReplicas(1))
.put(IndexMetaData.builder("test2").settings(settings(Version.CURRENT)).numberOfShards(1).numberOfReplicas(1))
.build();
RoutingTable routingTable = RoutingTable.builder()
.addAsNew(metaData.index("test1"))
.addAsNew(metaData.index("test2"))
.build();
ShardIterator shardIterator = routingTable.index("test1").shard(0).shardsIt(0);
assertThat(shardIterator.size(), equalTo(2));
ShardRouting shardRouting1 = shardIterator.nextOrNull();
assertThat(shardRouting1, notNullValue());
assertThat(shardIterator.remaining(), equalTo(1));
ShardRouting shardRouting2 = shardIterator.nextOrNull();
assertThat(shardRouting2, notNullValue());
assertThat(shardIterator.remaining(), equalTo(0));
assertThat(shardRouting2, not(sameInstance(shardRouting1)));
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardIterator.remaining(), equalTo(0));
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardIterator.remaining(), equalTo(0));
shardIterator = routingTable.index("test1").shard(0).shardsIt(1);
assertThat(shardIterator.size(), equalTo(2));
ShardRouting shardRouting3 = shardIterator.nextOrNull();
assertThat(shardRouting1, notNullValue());
ShardRouting shardRouting4 = shardIterator.nextOrNull();
assertThat(shardRouting2, notNullValue());
assertThat(shardRouting2, not(sameInstance(shardRouting1)));
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardRouting1, not(sameInstance(shardRouting3)));
assertThat(shardRouting2, not(sameInstance(shardRouting4)));
assertThat(shardRouting1, sameInstance(shardRouting4));
assertThat(shardRouting2, sameInstance(shardRouting3));
shardIterator = routingTable.index("test1").shard(0).shardsIt(2);
assertThat(shardIterator.size(), equalTo(2));
ShardRouting shardRouting5 = shardIterator.nextOrNull();
assertThat(shardRouting5, notNullValue());
ShardRouting shardRouting6 = shardIterator.nextOrNull();
assertThat(shardRouting6, notNullValue());
assertThat(shardRouting6, not(sameInstance(shardRouting5)));
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardRouting5, sameInstance(shardRouting1));
assertThat(shardRouting6, sameInstance(shardRouting2));
shardIterator = routingTable.index("test1").shard(0).shardsIt(3);
assertThat(shardIterator.size(), equalTo(2));
ShardRouting shardRouting7 = shardIterator.nextOrNull();
assertThat(shardRouting7, notNullValue());
ShardRouting shardRouting8 = shardIterator.nextOrNull();
assertThat(shardRouting8, notNullValue());
assertThat(shardRouting8, not(sameInstance(shardRouting7)));
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardRouting7, sameInstance(shardRouting3));
assertThat(shardRouting8, sameInstance(shardRouting4));
shardIterator = routingTable.index("test1").shard(0).shardsIt(4);
assertThat(shardIterator.size(), equalTo(2));
ShardRouting shardRouting9 = shardIterator.nextOrNull();
assertThat(shardRouting9, notNullValue());
ShardRouting shardRouting10 = shardIterator.nextOrNull();
assertThat(shardRouting10, notNullValue());
assertThat(shardRouting10, not(sameInstance(shardRouting9)));
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardRouting9, sameInstance(shardRouting5));
assertThat(shardRouting10, sameInstance(shardRouting6));
}
public void testRandomRouting() {
MetaData metaData = MetaData.builder()
.put(IndexMetaData.builder("test1").settings(settings(Version.CURRENT)).numberOfShards(1).numberOfReplicas(1))
.put(IndexMetaData.builder("test2").settings(settings(Version.CURRENT)).numberOfShards(1).numberOfReplicas(1))
.build();
RoutingTable routingTable = RoutingTable.builder()
.addAsNew(metaData.index("test1"))
.addAsNew(metaData.index("test2"))
.build();
ShardIterator shardIterator = routingTable.index("test1").shard(0).shardsRandomIt();
ShardRouting shardRouting1 = shardIterator.nextOrNull();
assertThat(shardRouting1, notNullValue());
assertThat(shardIterator.nextOrNull(), notNullValue());
assertThat(shardIterator.nextOrNull(), nullValue());
shardIterator = routingTable.index("test1").shard(0).shardsRandomIt();
ShardRouting shardRouting2 = shardIterator.nextOrNull();
assertThat(shardRouting2, notNullValue());
ShardRouting shardRouting3 = shardIterator.nextOrNull();
assertThat(shardRouting3, notNullValue());
assertThat(shardIterator.nextOrNull(), nullValue());
assertThat(shardRouting1, not(sameInstance(shardRouting2)));
assertThat(shardRouting1, sameInstance(shardRouting3));
}
public void testAttributePreferenceRouting() {
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.awareness.attributes", "rack_id,zone")
.build());
MetaData metaData = MetaData.builder()
.put(IndexMetaData.builder("test").settings(settings(Version.CURRENT)).numberOfShards(1).numberOfReplicas(1))
.build();
RoutingTable routingTable = RoutingTable.builder()
.addAsNew(metaData.index("test"))
.build();
ClusterState clusterState = ClusterState.builder(ClusterName.CLUSTER_NAME_SETTING.getDefault(Settings.EMPTY)).metaData(metaData).routingTable(routingTable).build();
Map<String, String> node1Attributes = new HashMap<>();
node1Attributes.put("rack_id", "rack_1");
node1Attributes.put("zone", "zone1");
Map<String, String> node2Attributes = new HashMap<>();
node2Attributes.put("rack_id", "rack_2");
node2Attributes.put("zone", "zone2");
clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder()
.add(newNode("node1", unmodifiableMap(node1Attributes)))
.add(newNode("node2", unmodifiableMap(node2Attributes)))
.localNodeId("node1")
).build();
clusterState = strategy.reroute(clusterState, "reroute");
clusterState = strategy.applyStartedShards(clusterState, clusterState.getRoutingNodes().shardsWithState(INITIALIZING));
clusterState = strategy.applyStartedShards(clusterState, clusterState.getRoutingNodes().shardsWithState(INITIALIZING));
// after all are started, check routing iteration
ShardIterator shardIterator = clusterState.routingTable().index("test").shard(0).preferAttributesActiveInitializingShardsIt(new String[]{"rack_id"}, clusterState.nodes());
ShardRouting shardRouting = shardIterator.nextOrNull();
assertThat(shardRouting, notNullValue());
assertThat(shardRouting.currentNodeId(), equalTo("node1"));
shardRouting = shardIterator.nextOrNull();
assertThat(shardRouting, notNullValue());
assertThat(shardRouting.currentNodeId(), equalTo("node2"));
shardIterator = clusterState.routingTable().index("test").shard(0).preferAttributesActiveInitializingShardsIt(new String[]{"rack_id"}, clusterState.nodes());
shardRouting = shardIterator.nextOrNull();
assertThat(shardRouting, notNullValue());
assertThat(shardRouting.currentNodeId(), equalTo("node1"));
shardRouting = shardIterator.nextOrNull();
assertThat(shardRouting, notNullValue());
assertThat(shardRouting.currentNodeId(), equalTo("node2"));
}
public void testNodeSelectorRouting(){
AllocationService strategy = createAllocationService(Settings.builder()
.put("cluster.routing.allocation.node_concurrent_recoveries", 10)
.put(ClusterRebalanceAllocationDecider.CLUSTER_ROUTING_ALLOCATION_ALLOW_REBALANCE_SETTING.getKey(), "always")
.build());
MetaData metaData = MetaData.builder()
.put(IndexMetaData.builder("test").settings(settings(Version.CURRENT)).numberOfShards(1).numberOfReplicas(1))
.build();
RoutingTable routingTable = RoutingTable.builder()
.addAsNew(metaData.index("test"))
.build();
ClusterState clusterState = ClusterState.builder(ClusterName.CLUSTER_NAME_SETTING.getDefault(Settings.EMPTY)).metaData(metaData).routingTable(routingTable).build();
clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder()
.add(newNode("fred", "node1", singletonMap("disk", "ebs")))
.add(newNode("barney", "node2", singletonMap("disk", "ephemeral")))
.localNodeId("node1")
).build();
clusterState = strategy.reroute(clusterState, "reroute");
clusterState = strategy.applyStartedShards(clusterState, clusterState.getRoutingNodes().shardsWithState(INITIALIZING));
ShardsIterator shardsIterator = clusterState.routingTable().index("test").shard(0).onlyNodeSelectorActiveInitializingShardsIt("disk:ebs",clusterState.nodes());
assertThat(shardsIterator.size(), equalTo(1));
assertThat(shardsIterator.nextOrNull().currentNodeId(),equalTo("node1"));
shardsIterator = clusterState.routingTable().index("test").shard(0).onlyNodeSelectorActiveInitializingShardsIt("dis*:eph*",clusterState.nodes());
assertThat(shardsIterator.size(), equalTo(1));
assertThat(shardsIterator.nextOrNull().currentNodeId(),equalTo("node2"));
shardsIterator = clusterState.routingTable().index("test").shard(0).onlyNodeSelectorActiveInitializingShardsIt("fred",clusterState.nodes());
assertThat(shardsIterator.size(), equalTo(1));
assertThat(shardsIterator.nextOrNull().currentNodeId(),equalTo("node1"));
shardsIterator = clusterState.routingTable().index("test").shard(0).onlyNodeSelectorActiveInitializingShardsIt("bar*",clusterState.nodes());
assertThat(shardsIterator.size(), equalTo(1));
assertThat(shardsIterator.nextOrNull().currentNodeId(),equalTo("node2"));
shardsIterator = clusterState.routingTable().index("test").shard(0)
.onlyNodeSelectorActiveInitializingShardsIt(new String[] {"disk:eph*","disk:ebs"},clusterState.nodes());
assertThat(shardsIterator.size(), equalTo(2));
assertThat(shardsIterator.nextOrNull().currentNodeId(),equalTo("node2"));
assertThat(shardsIterator.nextOrNull().currentNodeId(),equalTo("node1"));
shardsIterator = clusterState.routingTable().index("test").shard(0)
.onlyNodeSelectorActiveInitializingShardsIt(new String[] {"disk:*", "invalid_name"},clusterState.nodes());
assertThat(shardsIterator.size(), equalTo(2));
assertThat(shardsIterator.nextOrNull().currentNodeId(),equalTo("node2"));
assertThat(shardsIterator.nextOrNull().currentNodeId(),equalTo("node1"));
shardsIterator = clusterState.routingTable().index("test").shard(0)
.onlyNodeSelectorActiveInitializingShardsIt(new String[] {"disk:*", "disk:*"},clusterState.nodes());
assertThat(shardsIterator.size(), equalTo(2));
assertThat(shardsIterator.nextOrNull().currentNodeId(),equalTo("node2"));
assertThat(shardsIterator.nextOrNull().currentNodeId(),equalTo("node1"));
try {
shardsIterator = clusterState.routingTable().index("test").shard(0).onlyNodeSelectorActiveInitializingShardsIt("welma", clusterState.nodes());
fail("should have raised illegalArgumentException");
} catch (IllegalArgumentException illegal) {
//expected exception
}
shardsIterator = clusterState.routingTable().index("test").shard(0).onlyNodeSelectorActiveInitializingShardsIt("fred",clusterState.nodes());
assertThat(shardsIterator.size(), equalTo(1));
assertThat(shardsIterator.nextOrNull().currentNodeId(),equalTo("node1"));
}
public void testShardsAndPreferNodeRouting() {
AllocationService strategy = createAllocationService(Settings.builder()
.put("cluster.routing.allocation.node_concurrent_recoveries", 10)
.build());
MetaData metaData = MetaData.builder()
.put(IndexMetaData.builder("test").settings(settings(Version.CURRENT)).numberOfShards(5).numberOfReplicas(1))
.build();
RoutingTable routingTable = RoutingTable.builder()
.addAsNew(metaData.index("test"))
.build();
ClusterState clusterState = ClusterState.builder(ClusterName.CLUSTER_NAME_SETTING.getDefault(Settings.EMPTY)).metaData(metaData).routingTable(routingTable).build();
clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder()
.add(newNode("node1"))
.add(newNode("node2"))
.localNodeId("node1")
).build();
clusterState = strategy.reroute(clusterState, "reroute");
clusterState = strategy.applyStartedShards(clusterState, clusterState.getRoutingNodes().shardsWithState(INITIALIZING));
clusterState = strategy.applyStartedShards(clusterState, clusterState.getRoutingNodes().shardsWithState(INITIALIZING));
OperationRouting operationRouting = new OperationRouting(Settings.EMPTY, new ClusterSettings(Settings.EMPTY,
ClusterSettings.BUILT_IN_CLUSTER_SETTINGS));
GroupShardsIterator<ShardIterator> shardIterators = operationRouting.searchShards(clusterState, new String[]{"test"}, null, "_shards:0");
assertThat(shardIterators.size(), equalTo(1));
assertThat(shardIterators.iterator().next().shardId().id(), equalTo(0));
shardIterators = operationRouting.searchShards(clusterState, new String[]{"test"}, null, "_shards:1");
assertThat(shardIterators.size(), equalTo(1));
assertThat(shardIterators.iterator().next().shardId().id(), equalTo(1));
//check node preference, first without preference to see they switch
shardIterators = operationRouting.searchShards(clusterState, new String[]{"test"}, null, "_shards:0|");
assertThat(shardIterators.size(), equalTo(1));
assertThat(shardIterators.iterator().next().shardId().id(), equalTo(0));
String firstRoundNodeId = shardIterators.iterator().next().nextOrNull().currentNodeId();
shardIterators = operationRouting.searchShards(clusterState, new String[]{"test"}, null, "_shards:0");
assertThat(shardIterators.size(), equalTo(1));
assertThat(shardIterators.iterator().next().shardId().id(), equalTo(0));
assertThat(shardIterators.iterator().next().nextOrNull().currentNodeId(), not(equalTo(firstRoundNodeId)));
shardIterators = operationRouting.searchShards(clusterState, new String[]{"test"}, null, "_shards:0|_prefer_nodes:node1");
assertThat(shardIterators.size(), equalTo(1));
assertThat(shardIterators.iterator().next().shardId().id(), equalTo(0));
assertThat(shardIterators.iterator().next().nextOrNull().currentNodeId(), equalTo("node1"));
shardIterators = operationRouting.searchShards(clusterState, new String[]{"test"}, null, "_shards:0|_prefer_nodes:node1,node2");
assertThat(shardIterators.size(), equalTo(1));
Iterator<ShardIterator> iterator = shardIterators.iterator();
final ShardIterator it = iterator.next();
assertThat(it.shardId().id(), equalTo(0));
final String firstNodeId = it.nextOrNull().currentNodeId();
assertThat(firstNodeId, anyOf(equalTo("node1"), equalTo("node2")));
if ("node1".equals(firstNodeId)) {
assertThat(it.nextOrNull().currentNodeId(), equalTo("node2"));
} else {
assertThat(it.nextOrNull().currentNodeId(), equalTo("node1"));
}
}
public void testReplicaShardPreferenceIters() throws Exception {
AllocationService strategy = createAllocationService(Settings.builder()
.put("cluster.routing.allocation.node_concurrent_recoveries", 10)
.build());
OperationRouting operationRouting = new OperationRouting(Settings.EMPTY, new ClusterSettings(Settings.EMPTY,
ClusterSettings.BUILT_IN_CLUSTER_SETTINGS));
MetaData metaData = MetaData.builder()
.put(IndexMetaData.builder("test").settings(settings(Version.CURRENT)).numberOfShards(2).numberOfReplicas(2))
.build();
RoutingTable routingTable = RoutingTable.builder()
.addAsNew(metaData.index("test"))
.build();
ClusterState clusterState = ClusterState.builder(ClusterName.CLUSTER_NAME_SETTING.getDefault(Settings.EMPTY)).metaData(metaData).routingTable(routingTable).build();
clusterState = ClusterState.builder(clusterState).nodes(DiscoveryNodes.builder()
.add(newNode("node1"))
.add(newNode("node2"))
.add(newNode("node3"))
.localNodeId("node1")
).build();
clusterState = strategy.reroute(clusterState, "reroute");
clusterState = strategy.applyStartedShards(clusterState, clusterState.getRoutingNodes().shardsWithState(INITIALIZING));
// When replicas haven't initialized, it comes back with the primary first, then initializing replicas
GroupShardsIterator<ShardIterator> shardIterators = operationRouting.searchShards(clusterState, new String[]{"test"}, null, "_replica_first");
assertThat(shardIterators.size(), equalTo(2)); // two potential shards
ShardIterator iter = shardIterators.iterator().next();
assertThat(iter.size(), equalTo(3)); // three potential candidates for the shard
ShardRouting routing = iter.nextOrNull();
assertNotNull(routing);
assertThat(routing.shardId().id(), anyOf(equalTo(0), equalTo(1)));
assertTrue(routing.primary()); // replicas haven't initialized yet, so primary is first
assertTrue(routing.started());
routing = iter.nextOrNull();
assertThat(routing.shardId().id(), anyOf(equalTo(0), equalTo(1)));
assertFalse(routing.primary());
assertTrue(routing.initializing());
routing = iter.nextOrNull();
assertThat(routing.shardId().id(), anyOf(equalTo(0), equalTo(1)));
assertFalse(routing.primary());
assertTrue(routing.initializing());
clusterState = strategy.applyStartedShards(clusterState, clusterState.getRoutingNodes().shardsWithState(INITIALIZING));
clusterState = strategy.applyStartedShards(clusterState, clusterState.getRoutingNodes().shardsWithState(INITIALIZING));
shardIterators = operationRouting.searchShards(clusterState, new String[]{"test"}, null, "_replica");
assertThat(shardIterators.size(), equalTo(2)); // two potential shards
iter = shardIterators.iterator().next();
assertThat(iter.size(), equalTo(2)); // two potential replicas for the shard
routing = iter.nextOrNull();
assertNotNull(routing);
assertThat(routing.shardId().id(), anyOf(equalTo(0), equalTo(1)));
assertFalse(routing.primary());
routing = iter.nextOrNull();
assertThat(routing.shardId().id(), anyOf(equalTo(0), equalTo(1)));
assertFalse(routing.primary());
shardIterators = operationRouting.searchShards(clusterState, new String[]{"test"}, null, "_replica_first");
assertThat(shardIterators.size(), equalTo(2)); // two potential shards
iter = shardIterators.iterator().next();
assertThat(iter.size(), equalTo(3)); // three potential candidates for the shard
routing = iter.nextOrNull();
assertNotNull(routing);
assertThat(routing.shardId().id(), anyOf(equalTo(0), equalTo(1)));
assertFalse(routing.primary());
routing = iter.nextOrNull();
assertThat(routing.shardId().id(), anyOf(equalTo(0), equalTo(1)));
assertFalse(routing.primary());
// finally the primary
routing = iter.nextOrNull();
assertThat(routing.shardId().id(), anyOf(equalTo(0), equalTo(1)));
assertTrue(routing.primary());
}
}