ShardsLimitAllocationTests.java

/*
 * Licensed to ElasticSearch and Shay Banon 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.test.unit.cluster.routing.allocation;

import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.cluster.metadata.MetaData;
import org.elasticsearch.cluster.routing.MutableShardRouting;
import org.elasticsearch.cluster.routing.RoutingNodes;
import org.elasticsearch.cluster.routing.RoutingTable;
import org.elasticsearch.cluster.routing.ShardRoutingState;
import org.elasticsearch.cluster.routing.allocation.AllocationService;
import org.elasticsearch.cluster.routing.allocation.decider.ShardsLimitAllocationDecider;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.logging.Loggers;
import org.elasticsearch.common.settings.ImmutableSettings;
import org.testng.annotations.Test;

import static org.elasticsearch.cluster.ClusterState.newClusterStateBuilder;
import static org.elasticsearch.cluster.metadata.IndexMetaData.newIndexMetaDataBuilder;
import static org.elasticsearch.cluster.metadata.MetaData.newMetaDataBuilder;
import static org.elasticsearch.cluster.node.DiscoveryNodes.newNodesBuilder;
import static org.elasticsearch.cluster.routing.RoutingBuilders.routingTable;
import static org.elasticsearch.cluster.routing.ShardRoutingState.*;
import static org.elasticsearch.common.settings.ImmutableSettings.settingsBuilder;
import static org.elasticsearch.test.unit.cluster.routing.allocation.RoutingAllocationTests.newNode;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.equalTo;

/**
 */
@Test
public class ShardsLimitAllocationTests {

    private final ESLogger logger = Loggers.getLogger(ShardsLimitAllocationTests.class);

    @Test
    public void indexLevelShardsLimitAllocate() {
        AllocationService strategy = new AllocationService(settingsBuilder().put("cluster.routing.allocation.concurrent_recoveries", 10).build());

        logger.info("Building initial routing table");

        MetaData metaData = newMetaDataBuilder()
                .put(newIndexMetaDataBuilder("test").settings(ImmutableSettings.settingsBuilder()
                        .put(IndexMetaData.SETTING_NUMBER_OF_SHARDS, 4)
                        .put(IndexMetaData.SETTING_NUMBER_OF_REPLICAS, 1)
                        .put(ShardsLimitAllocationDecider.INDEX_TOTAL_SHARDS_PER_NODE, 2)))
                .build();

        RoutingTable routingTable = routingTable()
                .addAsNew(metaData.index("test"))
                .build();

        ClusterState clusterState = newClusterStateBuilder().metaData(metaData).routingTable(routingTable).build();
        logger.info("Adding two nodes and performing rerouting");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().put(newNode("node1")).put(newNode("node2"))).build();
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(clusterState.readOnlyRoutingNodes().node("node1").numberOfShardsWithState(ShardRoutingState.INITIALIZING), equalTo(2));
        assertThat(clusterState.readOnlyRoutingNodes().node("node2").numberOfShardsWithState(ShardRoutingState.INITIALIZING), equalTo(2));

        logger.info("Start the primary shards");
        RoutingNodes routingNodes = clusterState.routingNodes();
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(clusterState.readOnlyRoutingNodes().node("node1").numberOfShardsWithState(ShardRoutingState.STARTED), equalTo(2));
        assertThat(clusterState.readOnlyRoutingNodes().node("node1").numberOfShardsWithState(ShardRoutingState.INITIALIZING), equalTo(0));
        assertThat(clusterState.readOnlyRoutingNodes().node("node2").numberOfShardsWithState(ShardRoutingState.STARTED), equalTo(2));
        assertThat(clusterState.readOnlyRoutingNodes().node("node2").numberOfShardsWithState(ShardRoutingState.INITIALIZING), equalTo(0));
        assertThat(clusterState.readOnlyRoutingNodes().unassigned().size(), equalTo(4));

        logger.info("Do another reroute, make sure its still not allocated");
        routingNodes = clusterState.routingNodes();
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();
    }

    @Test
    public void indexLevelShardsLimitRemain() {
        AllocationService strategy = new AllocationService(settingsBuilder()
                .put("cluster.routing.allocation.concurrent_recoveries", 10)
                .put("cluster.routing.allocation.node_initial_primaries_recoveries", 10)
                .put("cluster.routing.allocation.cluster_concurrent_rebalance", -1)
                .build());

        logger.info("Building initial routing table");

        MetaData metaData = newMetaDataBuilder()
                .put(newIndexMetaDataBuilder("test").settings(ImmutableSettings.settingsBuilder()
                        .put(IndexMetaData.SETTING_NUMBER_OF_SHARDS, 5)
                        .put(IndexMetaData.SETTING_NUMBER_OF_REPLICAS, 0)
                ))
                .build();

        RoutingTable routingTable = routingTable()
                .addAsNew(metaData.index("test"))
                .build();

        ClusterState clusterState = newClusterStateBuilder().metaData(metaData).routingTable(routingTable).build();
        logger.info("Adding one node and reroute");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().put(newNode("node1"))).build();
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        logger.info("Start the primary shards");
        RoutingNodes routingNodes = clusterState.routingNodes();
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(clusterState.readOnlyRoutingNodes().numberOfShardsOfType(STARTED), equalTo(5));

        logger.info("add another index with 5 shards");
        metaData = newMetaDataBuilder().metaData(metaData)
                .put(newIndexMetaDataBuilder("test1").settings(ImmutableSettings.settingsBuilder()
                        .put(IndexMetaData.SETTING_NUMBER_OF_SHARDS, 5)
                        .put(IndexMetaData.SETTING_NUMBER_OF_REPLICAS, 0)
                ))
                .build();
        routingTable = routingTable().routingTable(routingTable)
                .addAsNew(metaData.index("test1"))
                .build();

        clusterState = newClusterStateBuilder().state(clusterState).metaData(metaData).routingTable(routingTable).build();

        logger.info("Add another one node and reroute");
        clusterState = newClusterStateBuilder().state(clusterState).nodes(newNodesBuilder().putAll(clusterState.nodes()).put(newNode("node2"))).build();
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        routingNodes = clusterState.routingNodes();
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(clusterState.readOnlyRoutingNodes().numberOfShardsOfType(STARTED), equalTo(10));

        for (MutableShardRouting shardRouting : clusterState.readOnlyRoutingNodes().node("node1")) {
            assertThat(shardRouting.index(), equalTo("test"));
        }
        for (MutableShardRouting shardRouting : clusterState.readOnlyRoutingNodes().node("node2")) {
            assertThat(shardRouting.index(), equalTo("test1"));
        }

        logger.info("update " + ShardsLimitAllocationDecider.INDEX_TOTAL_SHARDS_PER_NODE + " for test, see that things move");
        metaData = newMetaDataBuilder().metaData(metaData)
                .put(newIndexMetaDataBuilder("test").settings(ImmutableSettings.settingsBuilder()
                        .put(IndexMetaData.SETTING_NUMBER_OF_SHARDS, 5)
                        .put(IndexMetaData.SETTING_NUMBER_OF_REPLICAS, 0)
                        .put(ShardsLimitAllocationDecider.INDEX_TOTAL_SHARDS_PER_NODE, 3)
                ))
                .build();


        clusterState = newClusterStateBuilder().state(clusterState).metaData(metaData).build();

        logger.info("reroute after setting");
        routingTable = strategy.reroute(clusterState).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(clusterState.readOnlyRoutingNodes().node("node1").numberOfShardsWithState(STARTED), equalTo(3));
        assertThat(clusterState.readOnlyRoutingNodes().node("node1").numberOfShardsWithState(RELOCATING), equalTo(2));

        logger.info("start the moving shards, a shard from test1 should move back to node1");
        routingNodes = clusterState.routingNodes();
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(clusterState.readOnlyRoutingNodes().node("node1").numberOfShardsWithState(STARTED), equalTo(3));
        assertThat(clusterState.readOnlyRoutingNodes().node("node1").numberOfShardsWithState(RELOCATING), equalTo(0));
        assertThat(clusterState.readOnlyRoutingNodes().node("node1").numberOfShardsWithState(INITIALIZING), equalTo(2));
        assertThat(clusterState.readOnlyRoutingNodes().node("node2").numberOfShardsWithState(STARTED), equalTo(5));
        assertThat(clusterState.readOnlyRoutingNodes().node("node2").numberOfShardsWithState(RELOCATING), equalTo(2));

        logger.info("finalize movement, another shard will move");
        routingNodes = clusterState.routingNodes();
        routingTable = strategy.applyStartedShards(clusterState, routingNodes.shardsWithState(INITIALIZING)).routingTable();
        clusterState = newClusterStateBuilder().state(clusterState).routingTable(routingTable).build();

        assertThat(clusterState.readOnlyRoutingNodes().node("node1").numberOfShardsWithState(STARTED), equalTo(5));
        assertThat(clusterState.readOnlyRoutingNodes().node("node2").numberOfShardsWithState(STARTED), equalTo(5));
    }
}