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Replica allocator unit tests 

First batch of unit tests to verify the behavior of replica allocator
This commit is contained in:
Shay Banon 2015-07-21 22:37:29 +02:00
parent b230927dbc
commit be3e315248
2 changed files with 261 additions and 1 deletions
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260
core/src/test/java/org/elasticsearch/gateway/ReplicaShardAllocatorTests.java Normal file
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@ -0,0 +1,260 @@
/*
* 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.gateway;
import org.elasticsearch.Version;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.cluster.metadata.MetaData;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.cluster.routing.*;
import org.elasticsearch.cluster.routing.allocation.RoutingAllocation;
import org.elasticsearch.cluster.routing.allocation.decider.AllocationDecider;
import org.elasticsearch.cluster.routing.allocation.decider.AllocationDeciders;
import org.elasticsearch.cluster.routing.allocation.decider.Decision;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.engine.Engine;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.index.store.Store;
import org.elasticsearch.index.store.StoreFileMetaData;
import org.elasticsearch.indices.store.TransportNodesListShardStoreMetaData;
import org.elasticsearch.test.ElasticsearchAllocationTestCase;
import org.junit.Before;
import org.junit.Test;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import static org.hamcrest.Matchers.equalTo;
/**
*/
public class ReplicaShardAllocatorTests extends ElasticsearchAllocationTestCase {
private final ShardId shardId = new ShardId("test", 0);
private final DiscoveryNode node1 = newNode("node1");
private final DiscoveryNode node2 = newNode("node2");
private final DiscoveryNode node3 = newNode("node3");
private TestAllocator testAllocator;
@Before
public void buildTestAllocator() {
this.testAllocator = new TestAllocator();
}
/**
* Verifies that when we are still fetching data in an async manner, the replica shard moves to ignore unassigned.
*/
@Test
public void testNoAsyncFetchData() {
RoutingAllocation allocation = onePrimaryOnNode1And1Replica(yesAllocationDeciders());
testAllocator.clean();
testAllocator.allocateUnassigned(allocation);
assertThat(allocation.routingNodes().unassigned().ignored().size(), equalTo(1));
assertThat(allocation.routingNodes().unassigned().ignored().get(0).shardId(), equalTo(shardId));
}
/**
* Verifies that when there is a full match (syncId and files) we allocate it to matching node.
*/
@Test
public void testSimpleFullMatchAllocation() {
RoutingAllocation allocation = onePrimaryOnNode1And1Replica(yesAllocationDeciders());
DiscoveryNode nodeToMatch = randomBoolean() ? node2 : node3;
testAllocator.addData(node1, true, "MATCH", new StoreFileMetaData("file1", 10, "MATCH_CHECKSUM"))
.addData(nodeToMatch, false, "MATCH", new StoreFileMetaData("file1", 10, "MATCH_CHECKSUM"));
testAllocator.allocateUnassigned(allocation);
assertThat(allocation.routingNodes().shardsWithState(ShardRoutingState.INITIALIZING).size(), equalTo(1));
assertThat(allocation.routingNodes().shardsWithState(ShardRoutingState.INITIALIZING).get(0).currentNodeId(), equalTo(nodeToMatch.id()));
}
/**
* Verifies that when there is a sync id match but no files match, we allocate it to matching node.
*/
@Test
public void testSyncIdMatch() {
RoutingAllocation allocation = onePrimaryOnNode1And1Replica(yesAllocationDeciders());
DiscoveryNode nodeToMatch = randomBoolean() ? node2 : node3;
testAllocator.addData(node1, true, "MATCH", new StoreFileMetaData("file1", 10, "MATCH_CHECKSUM"))
.addData(nodeToMatch, false, "MATCH", new StoreFileMetaData("file1", 10, "NO_MATCH_CHECKSUM"));
testAllocator.allocateUnassigned(allocation);
assertThat(allocation.routingNodes().shardsWithState(ShardRoutingState.INITIALIZING).size(), equalTo(1));
assertThat(allocation.routingNodes().shardsWithState(ShardRoutingState.INITIALIZING).get(0).currentNodeId(), equalTo(nodeToMatch.id()));
}
/**
* Verifies that when there is no sync id match but files match, we allocate it to matching node.
*/
@Test
public void testFileChecksumMatch() {
RoutingAllocation allocation = onePrimaryOnNode1And1Replica(yesAllocationDeciders());
DiscoveryNode nodeToMatch = randomBoolean() ? node2 : node3;
testAllocator.addData(node1, true, "MATCH", new StoreFileMetaData("file1", 10, "MATCH_CHECKSUM"))
.addData(nodeToMatch, false, "NO_MATCH", new StoreFileMetaData("file1", 10, "MATCH_CHECKSUM"));
testAllocator.allocateUnassigned(allocation);
assertThat(allocation.routingNodes().shardsWithState(ShardRoutingState.INITIALIZING).size(), equalTo(1));
assertThat(allocation.routingNodes().shardsWithState(ShardRoutingState.INITIALIZING).get(0).currentNodeId(), equalTo(nodeToMatch.id()));
}
/**
* When we can't find primary data, but still find replica data, we go ahead and keep it unassigned
* to be allocated.
* TODO: this might be the wrong decision here, and we should restart the fetching process maybe to really find a primary copy?
*/
@Test
public void testNoPrimaryData() {
RoutingAllocation allocation = onePrimaryOnNode1And1Replica(yesAllocationDeciders());
testAllocator.addData(node2, true, "MATCH", new StoreFileMetaData("file1", 10, "MATCH_CHECKSUM"));
testAllocator.allocateUnassigned(allocation);
assertThat(allocation.routingNodes().shardsWithState(ShardRoutingState.UNASSIGNED).size(), equalTo(1));
assertThat(allocation.routingNodes().shardsWithState(ShardRoutingState.UNASSIGNED).get(0).shardId(), equalTo(shardId));
}
/**
* Verifies that when there is primary data, but no data at all on other nodes, the shard keeps
* unassigned to be allocated later on.
*/
@Test
public void testNoDataForReplicaOnAnyNode() {
RoutingAllocation allocation = onePrimaryOnNode1And1Replica(yesAllocationDeciders());
testAllocator.addData(node1, true, "MATCH", new StoreFileMetaData("file1", 10, "MATCH_CHECKSUM"));
testAllocator.allocateUnassigned(allocation);
assertThat(allocation.routingNodes().shardsWithState(ShardRoutingState.UNASSIGNED).size(), equalTo(1));
assertThat(allocation.routingNodes().shardsWithState(ShardRoutingState.UNASSIGNED).get(0).shardId(), equalTo(shardId));
}
/**
* Verifies that when there is primary data, but no matching data at all on other nodes, the shard keeps
* unassigned to be allocated later on.
*/
@Test
public void testNoMatchingFilesForReplicaOnAnyNode() {
RoutingAllocation allocation = onePrimaryOnNode1And1Replica(yesAllocationDeciders());
testAllocator.addData(node1, true, "MATCH", new StoreFileMetaData("file1", 10, "MATCH_CHECKSUM"))
.addData(node2, false, "NO_MATCH", new StoreFileMetaData("file1", 10, "NO_MATCH_CHECKSUM"));
testAllocator.allocateUnassigned(allocation);
assertThat(allocation.routingNodes().shardsWithState(ShardRoutingState.UNASSIGNED).size(), equalTo(1));
assertThat(allocation.routingNodes().shardsWithState(ShardRoutingState.UNASSIGNED).get(0).shardId(), equalTo(shardId));
}
/**
* When there is no decision or throttle decision across all nodes for the shard, make sure the shard
* moves to the ignore unassigned list.
*/
@Test
public void testNoOrThrottleDecidersRemainsInUnassigned() {
RoutingAllocation allocation = onePrimaryOnNode1And1Replica(randomBoolean() ? noAllocationDeciders() : throttleAllocationDeciders());
testAllocator.addData(node1, true, "MATCH", new StoreFileMetaData("file1", 10, "MATCH_CHECKSUM"))
.addData(node2, false, "MATCH", new StoreFileMetaData("file1", 10, "MATCH_CHECKSUM"));
testAllocator.allocateUnassigned(allocation);
assertThat(allocation.routingNodes().unassigned().ignored().size(), equalTo(1));
assertThat(allocation.routingNodes().unassigned().ignored().get(0).shardId(), equalTo(shardId));
}
/**
* Tests when the node to allocate to due to matching is being throttled, we move the shard to ignored
* to wait till throttling on it is done.
*/
@Test
public void testThrottleWhenAllocatingToMatchingNode() {
RoutingAllocation allocation = onePrimaryOnNode1And1Replica(new AllocationDeciders(Settings.EMPTY,
new AllocationDecider[]{new TestAllocateDecision(Decision.YES), new AllocationDecider(Settings.EMPTY) {
@Override
public Decision canAllocate(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation) {
if (node.node().equals(node2)) {
return Decision.THROTTLE;
}
return Decision.YES;
}
}}));
testAllocator.addData(node1, true, "MATCH", new StoreFileMetaData("file1", 10, "MATCH_CHECKSUM"))
.addData(node2, false, "MATCH", new StoreFileMetaData("file1", 10, "MATCH_CHECKSUM"));
testAllocator.allocateUnassigned(allocation);
assertThat(allocation.routingNodes().unassigned().ignored().size(), equalTo(1));
assertThat(allocation.routingNodes().unassigned().ignored().get(0).shardId(), equalTo(shardId));
}
private RoutingAllocation onePrimaryOnNode1And1Replica(AllocationDeciders deciders) {
MetaData metaData = MetaData.builder()
.put(IndexMetaData.builder(shardId.getIndex()).settings(settings(Version.CURRENT)).numberOfShards(1).numberOfReplicas(0))
.build();
RoutingTable routingTable = RoutingTable.builder()
.add(IndexRoutingTable.builder(shardId.getIndex())
.addIndexShard(new IndexShardRoutingTable.Builder(shardId)
.addShard(TestShardRouting.newShardRouting(shardId.getIndex(), shardId.getId(), node1.id(), true, ShardRoutingState.STARTED, 10))
.addShard(ShardRouting.newUnassigned(shardId.getIndex(), shardId.getId(), null, false, new UnassignedInfo(UnassignedInfo.Reason.INDEX_CREATED, null)))
.build())
)
.build();
ClusterState state = ClusterState.builder(org.elasticsearch.cluster.ClusterName.DEFAULT)
.metaData(metaData)
.routingTable(routingTable)
.nodes(DiscoveryNodes.builder().put(node1).put(node2).put(node3)).build();
return new RoutingAllocation(deciders, state.routingNodes(), state.nodes(), null);
}
class TestAllocator extends ReplicaShardAllocator {
private Map<DiscoveryNode, TransportNodesListShardStoreMetaData.StoreFilesMetaData> data = null;
public TestAllocator() {
super(Settings.EMPTY);
}
public void clean() {
data = null;
}
public void cleanWithEmptyData() {
data = new HashMap<>();
}
public TestAllocator addData(DiscoveryNode node, boolean allocated, String syncId, StoreFileMetaData... files) {
if (data == null) {
data = new HashMap<>();
}
Map<String, StoreFileMetaData> filesAsMap = new HashMap<>();
for (StoreFileMetaData file : files) {
filesAsMap.put(file.name(), file);
}
Map<String, String> commitData = new HashMap<>();
if (syncId != null) {
commitData.put(Engine.SYNC_COMMIT_ID, syncId);
}
data.put(node, new TransportNodesListShardStoreMetaData.StoreFilesMetaData(allocated, shardId, new Store.MetadataSnapshot(filesAsMap, commitData, randomInt())));
return this;
}
@Override
protected AsyncShardFetch.FetchResult<TransportNodesListShardStoreMetaData.NodeStoreFilesMetaData> fetchData(ShardRouting shard, RoutingAllocation allocation) {
Map<DiscoveryNode, TransportNodesListShardStoreMetaData.NodeStoreFilesMetaData> tData = null;
if (data != null) {
tData = new HashMap<>();
for (Map.Entry<DiscoveryNode, TransportNodesListShardStoreMetaData.StoreFilesMetaData> entry : data.entrySet()) {
tData.put(entry.getKey(), new TransportNodesListShardStoreMetaData.NodeStoreFilesMetaData(entry.getKey(), entry.getValue()));
}
}
return new AsyncShardFetch.FetchResult<>(shardId, tData, Collections.<String>emptySet(), Collections.<String>emptySet());
}
}
}

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core/src/test/java/org/elasticsearch/test/ElasticsearchAllocationTestCase.java
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@ -137,7 +137,7 @@ public abstract class ElasticsearchAllocationTestCase extends ElasticsearchTestC
return new AllocationDeciders(Settings.EMPTY, new AllocationDecider[] {new TestAllocateDecision(Decision.THROTTLE)});
}
static class TestAllocateDecision extends AllocationDecider {
public static class TestAllocateDecision extends AllocationDecider {
private final Decision decision;