MetaDataDeleteIndexService.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.cluster.metadata;

import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.ClusterStateUpdateTask;
import org.elasticsearch.cluster.action.index.NodeIndexDeletedAction;
import org.elasticsearch.cluster.block.ClusterBlocks;
import org.elasticsearch.cluster.routing.RoutingTable;
import org.elasticsearch.cluster.routing.allocation.AllocationService;
import org.elasticsearch.cluster.routing.allocation.RoutingAllocationResult;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.index.Index;
import org.elasticsearch.indices.IndexMissingException;
import org.elasticsearch.threadpool.ThreadPool;

import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;

import static org.elasticsearch.cluster.ClusterState.newClusterStateBuilder;
import static org.elasticsearch.cluster.metadata.MetaData.newMetaDataBuilder;

/**
 *
 */
public class MetaDataDeleteIndexService extends AbstractComponent {

    private final ThreadPool threadPool;

    private final ClusterService clusterService;

    private final AllocationService allocationService;

    private final NodeIndexDeletedAction nodeIndexDeletedAction;

    private final MetaDataService metaDataService;

    @Inject
    public MetaDataDeleteIndexService(Settings settings, ThreadPool threadPool, ClusterService clusterService, AllocationService allocationService,
                                      NodeIndexDeletedAction nodeIndexDeletedAction, MetaDataService metaDataService) {
        super(settings);
        this.threadPool = threadPool;
        this.clusterService = clusterService;
        this.allocationService = allocationService;
        this.nodeIndexDeletedAction = nodeIndexDeletedAction;
        this.metaDataService = metaDataService;
    }

    public void deleteIndex(final Request request, final Listener userListener) {
        // we lock here, and not within the cluster service callback since we don't want to
        // block the whole cluster state handling
        MetaDataService.MdLock mdLock = metaDataService.indexMetaDataLock(request.index);
        try {
            mdLock.lock();
        } catch (InterruptedException e) {
            userListener.onFailure(e);
            return;
        }

        final DeleteIndexListener listener = new DeleteIndexListener(mdLock, request, userListener);
        clusterService.submitStateUpdateTask("delete-index [" + request.index + "]", new ClusterStateUpdateTask() {
            @Override
            public ClusterState execute(ClusterState currentState) {
                try {
                    if (!currentState.metaData().hasConcreteIndex(request.index)) {
                        listener.onFailure(new IndexMissingException(new Index(request.index)));
                        return currentState;
                    }

                    logger.info("[{}] deleting index", request.index);

                    RoutingTable.Builder routingTableBuilder = RoutingTable.builder().routingTable(currentState.routingTable());
                    routingTableBuilder.remove(request.index);

                    MetaData newMetaData = newMetaDataBuilder()
                            .metaData(currentState.metaData())
                            .remove(request.index)
                            .build();

                    RoutingAllocationResult routingResult = allocationService.reroute(
                            newClusterStateBuilder().state(currentState).routingTable(routingTableBuilder).metaData(newMetaData).build());

                    ClusterBlocks blocks = ClusterBlocks.builder().blocks(currentState.blocks()).removeIndexBlocks(request.index).build();

                    final AtomicInteger counter = new AtomicInteger(currentState.nodes().size());

                    final NodeIndexDeletedAction.Listener nodeIndexDeleteListener = new NodeIndexDeletedAction.Listener() {
                        @Override
                        public void onNodeIndexDeleted(String index, String nodeId) {
                            if (index.equals(request.index)) {
                                if (counter.decrementAndGet() == 0) {
                                    listener.onResponse(new Response(true));
                                    nodeIndexDeletedAction.remove(this);
                                }
                            }
                        }
                    };
                    nodeIndexDeletedAction.add(nodeIndexDeleteListener);

                    listener.future = threadPool.schedule(request.timeout, ThreadPool.Names.SAME, new Runnable() {
                        @Override
                        public void run() {
                            listener.onResponse(new Response(false));
                            nodeIndexDeletedAction.remove(nodeIndexDeleteListener);
                        }
                    });

                    return newClusterStateBuilder().state(currentState).routingResult(routingResult).metaData(newMetaData).blocks(blocks).build();
                } catch (Exception e) {
                    listener.onFailure(e);
                    return currentState;
                }
            }
        });
    }

    class DeleteIndexListener implements Listener {

        private final AtomicBoolean notified = new AtomicBoolean();

        private final MetaDataService.MdLock mdLock;

        private final Request request;

        private final Listener listener;

        volatile ScheduledFuture future;

        private DeleteIndexListener(MetaDataService.MdLock mdLock, Request request, Listener listener) {
            this.mdLock = mdLock;
            this.request = request;
            this.listener = listener;
        }

        @Override
        public void onResponse(final Response response) {
            if (notified.compareAndSet(false, true)) {
                mdLock.unlock();
                if (future != null) {
                    future.cancel(false);
                }
                listener.onResponse(response);
            }
        }

        @Override
        public void onFailure(Throwable t) {
            if (notified.compareAndSet(false, true)) {
                mdLock.unlock();
                if (future != null) {
                    future.cancel(false);
                }
                listener.onFailure(t);
            }
        }
    }


    public static interface Listener {

        void onResponse(Response response);

        void onFailure(Throwable t);
    }

    public static class Request {

        final String index;

        TimeValue timeout = TimeValue.timeValueSeconds(10);

        public Request(String index) {
            this.index = index;
        }

        public Request timeout(TimeValue timeout) {
            this.timeout = timeout;
            return this;
        }
    }

    public static class Response {
        private final boolean acknowledged;

        public Response(boolean acknowledged) {
            this.acknowledged = acknowledged;
        }

        public boolean acknowledged() {
            return acknowledged;
        }
    }
}