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/*
 * 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
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package org.elasticsearch.cluster.routing;

import org.apache.logging.log4j.message.ParameterizedMessage;
import org.apache.logging.log4j.util.Supplier;
import org.elasticsearch.cluster.ClusterChangedEvent;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.ClusterStateUpdateTask;
import org.elasticsearch.cluster.routing.allocation.AllocationService;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.Priority;
import org.elasticsearch.common.component.AbstractLifecycleComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;

import java.util.concurrent.atomic.AtomicBoolean;

/**
 * A {@link RoutingService} listens to clusters state. When this service
 * receives a {@link ClusterChangedEvent} the cluster state will be verified and
 * the routing tables might be updated.
 * 

* Note: The {@link RoutingService} is responsible for cluster wide operations * that include modifications to the cluster state. Such an operation can only * be performed on the clusters master node. Unless the local node this service * is running on is the clusters master node this service will not perform any * actions. *

*/ public class RoutingService extends AbstractLifecycleComponent { private static final String CLUSTER_UPDATE_TASK_SOURCE = "cluster_reroute"; private final ClusterService clusterService; private final AllocationService allocationService; private AtomicBoolean rerouting = new AtomicBoolean(); @Inject public RoutingService(Settings settings, ClusterService clusterService, AllocationService allocationService) { super(settings); this.clusterService = clusterService; this.allocationService = allocationService; } @Override protected void doStart() { } @Override protected void doStop() { } @Override protected void doClose() { } /** * Initiates a reroute. */ public final void reroute(String reason) { performReroute(reason); } // visible for testing protected void performReroute(String reason) { try { if (lifecycle.stopped()) { return; } if (rerouting.compareAndSet(false, true) == false) { logger.trace("already has pending reroute, ignoring {}", reason); return; } logger.trace("rerouting {}", reason); clusterService.submitStateUpdateTask(CLUSTER_UPDATE_TASK_SOURCE + "(" + reason + ")", new ClusterStateUpdateTask(Priority.HIGH) { @Override public ClusterState execute(ClusterState currentState) { rerouting.set(false); return allocationService.reroute(currentState, reason); } @Override public void onNoLongerMaster(String source) { rerouting.set(false); // no biggie } @Override public void onFailure(String source, Exception e) { rerouting.set(false); ClusterState state = clusterService.state(); if (logger.isTraceEnabled()) { logger.error((Supplier) () -> new ParameterizedMessage("unexpected failure during [{}], current state:\n{}", source, state), e); } else { logger.error((Supplier) () -> new ParameterizedMessage("unexpected failure during [{}], current state version [{}]", source, state.version()), e); } } }); } catch (Exception e) { rerouting.set(false); ClusterState state = clusterService.state(); logger.warn((Supplier) () -> new ParameterizedMessage("failed to reroute routing table, current state:\n{}", state), e); } } }




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