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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
* "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.routing.allocation.decider;
import org.elasticsearch.cluster.routing.ShardRouting;
import org.elasticsearch.cluster.routing.allocation.RoutingAllocation;
import org.elasticsearch.common.settings.Settings;
/**
* Only allow rebalancing when all shards are active within the shard replication group.
*/
public class RebalanceOnlyWhenActiveAllocationDecider extends AllocationDecider {
public static final String NAME = "rebalance_only_when_active";
public RebalanceOnlyWhenActiveAllocationDecider(Settings settings) {
super(settings);
}
@Override
public Decision canRebalance(ShardRouting shardRouting, RoutingAllocation allocation) {
if (!allocation.routingNodes().allReplicasActive(shardRouting.shardId(), allocation.metaData())) {
return allocation.decision(Decision.NO, NAME, "rebalancing is not allowed until all replicas in the cluster are active");
}
return allocation.decision(Decision.YES, NAME, "rebalancing is allowed as all replicas are active in the cluster");
}
}