Examples with AllocationDecider org.opensearch.cluster.routing.allocation.decider.AllocationDecider used on opensource projects

Example 1 with AllocationDecider

use of org.opensearch.cluster.routing.allocation.decider.AllocationDecider in project OpenSearch by opensearch-project.

the class ClusterModule method createAllocationDeciders.

// TODO: this is public so allocation benchmark can access the default deciders...can we do that in another way?
/**
 * Return a new {@link AllocationDecider} instance with builtin deciders as well as those from plugins.
 */
public static Collection<AllocationDecider> createAllocationDeciders(Settings settings, ClusterSettings clusterSettings, List<ClusterPlugin> clusterPlugins) {
    // collect deciders by class so that we can detect duplicates
    Map<Class, AllocationDecider> deciders = new LinkedHashMap<>();
    addAllocationDecider(deciders, new MaxRetryAllocationDecider());
    addAllocationDecider(deciders, new ResizeAllocationDecider());
    addAllocationDecider(deciders, new ReplicaAfterPrimaryActiveAllocationDecider());
    addAllocationDecider(deciders, new RebalanceOnlyWhenActiveAllocationDecider());
    addAllocationDecider(deciders, new ClusterRebalanceAllocationDecider(settings, clusterSettings));
    addAllocationDecider(deciders, new ConcurrentRebalanceAllocationDecider(settings, clusterSettings));
    addAllocationDecider(deciders, new ConcurrentRecoveriesAllocationDecider(settings, clusterSettings));
    addAllocationDecider(deciders, new EnableAllocationDecider(settings, clusterSettings));
    addAllocationDecider(deciders, new NodeVersionAllocationDecider());
    addAllocationDecider(deciders, new SnapshotInProgressAllocationDecider());
    addAllocationDecider(deciders, new RestoreInProgressAllocationDecider());
    addAllocationDecider(deciders, new FilterAllocationDecider(settings, clusterSettings));
    addAllocationDecider(deciders, new SameShardAllocationDecider(settings, clusterSettings));
    addAllocationDecider(deciders, new DiskThresholdDecider(settings, clusterSettings));
    addAllocationDecider(deciders, new ThrottlingAllocationDecider(settings, clusterSettings));
    addAllocationDecider(deciders, new ShardsLimitAllocationDecider(settings, clusterSettings));
    addAllocationDecider(deciders, new AwarenessAllocationDecider(settings, clusterSettings));
    addAllocationDecider(deciders, new NodeLoadAwareAllocationDecider(settings, clusterSettings));
    clusterPlugins.stream().flatMap(p -> p.createAllocationDeciders(settings, clusterSettings).stream()).forEach(d -> addAllocationDecider(deciders, d));
    return deciders.values();
}

Example 2 with AllocationDecider

use of org.opensearch.cluster.routing.allocation.decider.AllocationDecider in project OpenSearch by opensearch-project.

the class DecisionsImpactOnClusterHealthTests method testPrimaryShardThrottleDecisionOnIndexCreation.

public void testPrimaryShardThrottleDecisionOnIndexCreation() throws IOException {
    final String indexName = "test-idx";
    Settings settings = Settings.builder().put(Environment.PATH_HOME_SETTING.getKey(), createTempDir().toAbsolutePath().toString()).build();
    AllocationDecider decider = new TestAllocateDecision(Decision.THROTTLE);
    // if deciders THROTTLE allocating a primary shard, stay in YELLOW state
    runAllocationTest(settings, indexName, Collections.singleton(decider), ClusterHealthStatus.YELLOW);
}

Example 3 with AllocationDecider

use of org.opensearch.cluster.routing.allocation.decider.AllocationDecider in project OpenSearch by opensearch-project.

the class DecisionsImpactOnClusterHealthTests method testPrimaryShardYesDecisionOnIndexCreation.

public void testPrimaryShardYesDecisionOnIndexCreation() throws IOException {
    final String indexName = "test-idx";
    Settings settings = Settings.builder().put(Environment.PATH_HOME_SETTING.getKey(), createTempDir().toAbsolutePath().toString()).build();
    AllocationDecider decider = new TestAllocateDecision(Decision.YES) {

        @Override
        public Decision canAllocate(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation) {
            if (node.getByShardId(shardRouting.shardId()) == null) {
                return Decision.YES;
            } else {
                return Decision.NO;
            }
        }
    };
    // if deciders say YES to allocating primary shards, stay in YELLOW state
    ClusterState clusterState = runAllocationTest(settings, indexName, Collections.singleton(decider), ClusterHealthStatus.YELLOW);
    // make sure primaries are initialized
    RoutingTable routingTable = clusterState.routingTable();
    for (IndexShardRoutingTable indexShardRoutingTable : routingTable.index(indexName)) {
        assertTrue(indexShardRoutingTable.primaryShard().initializing());
    }
}

Example 4 with AllocationDecider

use of org.opensearch.cluster.routing.allocation.decider.AllocationDecider in project OpenSearch by opensearch-project.

the class BalancedSingleShardTests method testDontBalanceShardWhenThresholdNotMet.

public void testDontBalanceShardWhenThresholdNotMet() {
    AllocationDecider canAllocateDecider = new AllocationDecider() {

        @Override
        public Decision canAllocate(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation) {
            return Decision.YES;
        }
    };
    // ridiculously high threshold setting so we won't rebalance
    Settings balancerSettings = Settings.builder().put(BalancedShardsAllocator.THRESHOLD_SETTING.getKey(), 1000f).build();
    Tuple<ClusterState, MoveDecision> rebalance = setupStateAndRebalance(canAllocateDecider, balancerSettings, false);
    ClusterState clusterState = rebalance.v1();
    MoveDecision rebalanceDecision = rebalance.v2();
    assertEquals(Type.YES, rebalanceDecision.getClusterRebalanceDecision().type());
    assertEquals(AllocationDecision.NO, rebalanceDecision.getAllocationDecision());
    assertNotNull(rebalanceDecision.getExplanation());
    assertEquals(clusterState.nodes().getSize() - 1, rebalanceDecision.getNodeDecisions().size());
    assertNull(rebalanceDecision.getTargetNode());
    int prevRanking = 0;
    for (NodeAllocationResult result : rebalanceDecision.getNodeDecisions()) {
        assertThat(result.getWeightRanking(), greaterThanOrEqualTo(prevRanking));
        prevRanking = result.getWeightRanking();
    }
}

Example 5 with AllocationDecider

use of org.opensearch.cluster.routing.allocation.decider.AllocationDecider in project OpenSearch by opensearch-project.

the class ClusterModuleTests method testAllocationDeciderOrder.

// makes sure that the allocation deciders are setup in the correct order, such that the
// slower allocation deciders come last and we can exit early if there is a NO decision without
// running them. If the order of the deciders is changed for a valid reason, the order should be
// changed in the test too.
public void testAllocationDeciderOrder() {
    List<Class<? extends AllocationDecider>> expectedDeciders = Arrays.asList(MaxRetryAllocationDecider.class, ResizeAllocationDecider.class, ReplicaAfterPrimaryActiveAllocationDecider.class, RebalanceOnlyWhenActiveAllocationDecider.class, ClusterRebalanceAllocationDecider.class, ConcurrentRebalanceAllocationDecider.class, ConcurrentRecoveriesAllocationDecider.class, EnableAllocationDecider.class, NodeVersionAllocationDecider.class, SnapshotInProgressAllocationDecider.class, RestoreInProgressAllocationDecider.class, FilterAllocationDecider.class, SameShardAllocationDecider.class, DiskThresholdDecider.class, ThrottlingAllocationDecider.class, ShardsLimitAllocationDecider.class, AwarenessAllocationDecider.class, NodeLoadAwareAllocationDecider.class);
    Collection<AllocationDecider> deciders = ClusterModule.createAllocationDeciders(Settings.EMPTY, new ClusterSettings(Settings.EMPTY, ClusterSettings.BUILT_IN_CLUSTER_SETTINGS), Collections.emptyList());
    Iterator<AllocationDecider> iter = deciders.iterator();
    int idx = 0;
    while (iter.hasNext()) {
        AllocationDecider decider = iter.next();
        assertSame(decider.getClass(), expectedDeciders.get(idx++));
    }
}