Examples with ShardsAllocator org.elasticsearch.cluster.routing.allocation.allocator.ShardsAllocator used on opensource projects

Example 1 with ShardsAllocator

use of org.elasticsearch.cluster.routing.allocation.allocator.ShardsAllocator in project elasticsearch by elastic.

the class BalanceConfigurationTests method testNoRebalanceOnPrimaryOverload.

public void testNoRebalanceOnPrimaryOverload() {
    Settings.Builder settings = Settings.builder();
    AllocationService strategy = new AllocationService(settings.build(), randomAllocationDeciders(settings.build(), new ClusterSettings(Settings.Builder.EMPTY_SETTINGS, ClusterSettings.BUILT_IN_CLUSTER_SETTINGS), random()), new TestGatewayAllocator(), new ShardsAllocator() {

        /*
             *  // this allocator tries to rebuild this scenario where a rebalance is
             *  // triggered solely by the primary overload on node [1] where a shard
             *  // is rebalanced to node 0
                routing_nodes:
                -----node_id[0][V]
                --------[test][0], node[0], [R], s[STARTED]
                --------[test][4], node[0], [R], s[STARTED]
                -----node_id[1][V]
                --------[test][0], node[1], [P], s[STARTED]
                --------[test][1], node[1], [P], s[STARTED]
                --------[test][3], node[1], [R], s[STARTED]
                -----node_id[2][V]
                --------[test][1], node[2], [R], s[STARTED]
                --------[test][2], node[2], [R], s[STARTED]
                --------[test][4], node[2], [P], s[STARTED]
                -----node_id[3][V]
                --------[test][2], node[3], [P], s[STARTED]
                --------[test][3], node[3], [P], s[STARTED]
                ---- unassigned
            */
        public void allocate(RoutingAllocation allocation) {
            RoutingNodes.UnassignedShards unassigned = allocation.routingNodes().unassigned();
            ShardRouting[] drain = unassigned.drain();
            // we have to allocate primaries first
            ArrayUtil.timSort(drain, (a, b) -> {
                return a.primary() ? -1 : 1;
            });
            for (ShardRouting sr : drain) {
                switch(sr.id()) {
                    case 0:
                        if (sr.primary()) {
                            allocation.routingNodes().initializeShard(sr, "node1", null, -1, allocation.changes());
                        } else {
                            allocation.routingNodes().initializeShard(sr, "node0", null, -1, allocation.changes());
                        }
                        break;
                    case 1:
                        if (sr.primary()) {
                            allocation.routingNodes().initializeShard(sr, "node1", null, -1, allocation.changes());
                        } else {
                            allocation.routingNodes().initializeShard(sr, "node2", null, -1, allocation.changes());
                        }
                        break;
                    case 2:
                        if (sr.primary()) {
                            allocation.routingNodes().initializeShard(sr, "node3", null, -1, allocation.changes());
                        } else {
                            allocation.routingNodes().initializeShard(sr, "node2", null, -1, allocation.changes());
                        }
                        break;
                    case 3:
                        if (sr.primary()) {
                            allocation.routingNodes().initializeShard(sr, "node3", null, -1, allocation.changes());
                        } else {
                            allocation.routingNodes().initializeShard(sr, "node1", null, -1, allocation.changes());
                        }
                        break;
                    case 4:
                        if (sr.primary()) {
                            allocation.routingNodes().initializeShard(sr, "node2", null, -1, allocation.changes());
                        } else {
                            allocation.routingNodes().initializeShard(sr, "node0", null, -1, allocation.changes());
                        }
                        break;
                }
            }
        }

        @Override
        public ShardAllocationDecision decideShardAllocation(ShardRouting shard, RoutingAllocation allocation) {
            throw new UnsupportedOperationException("explain not supported");
        }
    }, EmptyClusterInfoService.INSTANCE);
    MetaData.Builder metaDataBuilder = MetaData.builder();
    RoutingTable.Builder routingTableBuilder = RoutingTable.builder();
    IndexMetaData.Builder indexMeta = IndexMetaData.builder("test").settings(settings(Version.CURRENT)).numberOfShards(5).numberOfReplicas(1);
    metaDataBuilder = metaDataBuilder.put(indexMeta);
    MetaData metaData = metaDataBuilder.build();
    for (ObjectCursor<IndexMetaData> cursor : metaData.indices().values()) {
        routingTableBuilder.addAsNew(cursor.value);
    }
    RoutingTable routingTable = routingTableBuilder.build();
    DiscoveryNodes.Builder nodes = DiscoveryNodes.builder();
    for (int i = 0; i < 4; i++) {
        DiscoveryNode node = newNode("node" + i);
        nodes.add(node);
    }
    ClusterState clusterState = ClusterState.builder(org.elasticsearch.cluster.ClusterName.CLUSTER_NAME_SETTING.getDefault(Settings.EMPTY)).nodes(nodes).metaData(metaData).routingTable(routingTable).build();
    routingTable = strategy.reroute(clusterState, "reroute").routingTable();
    clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();
    RoutingNodes routingNodes = clusterState.getRoutingNodes();
    for (RoutingNode routingNode : routingNodes) {
        for (ShardRouting shardRouting : routingNode) {
            assertThat(shardRouting.state(), Matchers.equalTo(ShardRoutingState.INITIALIZING));
        }
    }
    strategy = createAllocationService(settings.build(), new NoopGatewayAllocator());
    logger.info("use the new allocator and check if it moves shards");
    routingNodes = clusterState.getRoutingNodes();
    routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
    clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();
    routingNodes = clusterState.getRoutingNodes();
    for (RoutingNode routingNode : routingNodes) {
        for (ShardRouting shardRouting : routingNode) {
            assertThat(shardRouting.state(), Matchers.equalTo(ShardRoutingState.STARTED));
        }
    }
    logger.info("start the replica shards");
    routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
    clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();
    routingNodes = clusterState.getRoutingNodes();
    for (RoutingNode routingNode : routingNodes) {
        for (ShardRouting shardRouting : routingNode) {
            assertThat(shardRouting.state(), Matchers.equalTo(ShardRoutingState.STARTED));
        }
    }
    logger.info("rebalancing");
    routingTable = strategy.reroute(clusterState, "reroute").routingTable();
    clusterState = ClusterState.builder(clusterState).routingTable(routingTable).build();
    routingNodes = clusterState.getRoutingNodes();
    for (RoutingNode routingNode : routingNodes) {
        for (ShardRouting shardRouting : routingNode) {
            assertThat(shardRouting.state(), Matchers.equalTo(ShardRoutingState.STARTED));
        }
    }
}

Example 2 with ShardsAllocator

use of org.elasticsearch.cluster.routing.allocation.allocator.ShardsAllocator in project elasticsearch by elastic.

the class ClusterModule method createShardsAllocator.

private static ShardsAllocator createShardsAllocator(Settings settings, ClusterSettings clusterSettings, List<ClusterPlugin> clusterPlugins) {
    Map<String, Supplier<ShardsAllocator>> allocators = new HashMap<>();
    allocators.put(BALANCED_ALLOCATOR, () -> new BalancedShardsAllocator(settings, clusterSettings));
    for (ClusterPlugin plugin : clusterPlugins) {
        plugin.getShardsAllocators(settings, clusterSettings).forEach((k, v) -> {
            if (allocators.put(k, v) != null) {
                throw new IllegalArgumentException("ShardsAllocator [" + k + "] already defined");
            }
        });
    }
    String allocatorName = SHARDS_ALLOCATOR_TYPE_SETTING.get(settings);
    Supplier<ShardsAllocator> allocatorSupplier = allocators.get(allocatorName);
    if (allocatorSupplier == null) {
        throw new IllegalArgumentException("Unknown ShardsAllocator [" + allocatorName + "]");
    }
    return Objects.requireNonNull(allocatorSupplier.get(), "ShardsAllocator factory for [" + allocatorName + "] returned null");
}

Example 3 with ShardsAllocator

use of org.elasticsearch.cluster.routing.allocation.allocator.ShardsAllocator in project elasticsearch by elastic.

the class ClusterModule method configure.

@Override
protected void configure() {
    bind(GatewayAllocator.class).asEagerSingleton();
    bind(AllocationService.class).asEagerSingleton();
    bind(ClusterService.class).toInstance(clusterService);
    bind(NodeConnectionsService.class).asEagerSingleton();
    bind(MetaDataCreateIndexService.class).asEagerSingleton();
    bind(MetaDataDeleteIndexService.class).asEagerSingleton();
    bind(MetaDataIndexStateService.class).asEagerSingleton();
    bind(MetaDataMappingService.class).asEagerSingleton();
    bind(MetaDataIndexAliasesService.class).asEagerSingleton();
    bind(MetaDataUpdateSettingsService.class).asEagerSingleton();
    bind(MetaDataIndexTemplateService.class).asEagerSingleton();
    bind(IndexNameExpressionResolver.class).toInstance(indexNameExpressionResolver);
    bind(RoutingService.class).asEagerSingleton();
    bind(DelayedAllocationService.class).asEagerSingleton();
    bind(ShardStateAction.class).asEagerSingleton();
    bind(NodeMappingRefreshAction.class).asEagerSingleton();
    bind(MappingUpdatedAction.class).asEagerSingleton();
    bind(TaskResultsService.class).asEagerSingleton();
    bind(AllocationDeciders.class).toInstance(new AllocationDeciders(settings, allocationDeciders));
    bind(ShardsAllocator.class).toInstance(shardsAllocator);
}

Example 4 with ShardsAllocator

use of org.elasticsearch.cluster.routing.allocation.allocator.ShardsAllocator in project elasticsearch by elastic.

the class ClusterAllocationExplainActionTests method testInitializingOrRelocatingShardExplanation.

public void testInitializingOrRelocatingShardExplanation() throws Exception {
    ShardRoutingState shardRoutingState = randomFrom(ShardRoutingState.INITIALIZING, ShardRoutingState.RELOCATING);
    ClusterState clusterState = ClusterStateCreationUtils.state("idx", randomBoolean(), shardRoutingState);
    ShardRouting shard = clusterState.getRoutingTable().index("idx").shard(0).primaryShard();
    RoutingAllocation allocation = new RoutingAllocation(new AllocationDeciders(Settings.EMPTY, Collections.emptyList()), clusterState.getRoutingNodes(), clusterState, null, System.nanoTime(), randomBoolean());
    ClusterAllocationExplanation cae = TransportClusterAllocationExplainAction.explainShard(shard, allocation, null, randomBoolean(), new TestGatewayAllocator(), new ShardsAllocator() {

        @Override
        public void allocate(RoutingAllocation allocation) {
        // no-op
        }

        @Override
        public ShardAllocationDecision decideShardAllocation(ShardRouting shard, RoutingAllocation allocation) {
            if (shard.initializing() || shard.relocating()) {
                return ShardAllocationDecision.NOT_TAKEN;
            } else {
                throw new UnsupportedOperationException("cannot explain");
            }
        }
    });
    assertEquals(shard.currentNodeId(), cae.getCurrentNode().getId());
    assertFalse(cae.getShardAllocationDecision().isDecisionTaken());
    assertFalse(cae.getShardAllocationDecision().getAllocateDecision().isDecisionTaken());
    assertFalse(cae.getShardAllocationDecision().getMoveDecision().isDecisionTaken());
    XContentBuilder builder = XContentFactory.jsonBuilder();
    cae.toXContent(builder, ToXContent.EMPTY_PARAMS);
    String explanation;
    if (shardRoutingState == ShardRoutingState.RELOCATING) {
        explanation = "the shard is in the process of relocating from node [] to node [], wait until " + "relocation has completed";
    } else {
        explanation = "the shard is in the process of initializing on node [], " + "wait until initialization has completed";
    }
    assertEquals("{\"index\":\"idx\",\"shard\":0,\"primary\":true,\"current_state\":\"" + shardRoutingState.toString().toLowerCase(Locale.ROOT) + "\",\"current_node\":" + "{\"id\":\"" + cae.getCurrentNode().getId() + "\",\"name\":\"" + cae.getCurrentNode().getName() + "\",\"transport_address\":\"" + cae.getCurrentNode().getAddress() + "\"},\"explanation\":\"" + explanation + "\"}", builder.string());
}