org.elasticsearch.cluster.routing.allocation.decider.RebalanceOnlyWhenActiveAllocationDecider Maven / Gradle / Ivy
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* Licensed to ElasticSearch and Shay Banon under one
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* 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,
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*/
package org.elasticsearch.cluster.routing.allocation.decider;
import org.elasticsearch.cluster.routing.MutableShardRouting;
import org.elasticsearch.cluster.routing.ShardRouting;
import org.elasticsearch.cluster.routing.allocation.RoutingAllocation;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import java.util.List;
/**
* Only allow rebalancing when all shards are active within the shard replication group.
*/
public class RebalanceOnlyWhenActiveAllocationDecider extends AllocationDecider {
@Inject
public RebalanceOnlyWhenActiveAllocationDecider(Settings settings) {
super(settings);
}
@Override
public Decision canRebalance(ShardRouting shardRouting, RoutingAllocation allocation) {
List shards = allocation.routingNodes().shardsRoutingFor(shardRouting);
// its ok to check for active here, since in relocation, a shard is split into two in routing
// nodes, once relocating, and one initializing
for (int i = 0; i < shards.size(); i++) {
if (!shards.get(i).active()) {
return Decision.NO;
}
}
return Decision.YES;
}
}