/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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;
import org.elasticsearch.cluster.routing.MutableShardRouting;
import org.elasticsearch.cluster.routing.RoutingNode;
import org.elasticsearch.cluster.routing.ShardRouting;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
/**
* An allocation strategy that only allows for a replica to be allocated when the primary is active.
*
* @author kimchy (shay.banon)
*/
public class ReplicaAfterPrimaryActiveNodeAllocation extends NodeAllocation {
@Inject public ReplicaAfterPrimaryActiveNodeAllocation(Settings settings) {
super(settings);
}
@Override public Decision canAllocate(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation) {
if (shardRouting.primary()) {
return Decision.YES;
}
MutableShardRouting primary = allocation.routingNodes().findPrimaryForReplica(shardRouting);
if (primary == null || !primary.active()) {
return Decision.NO;
}
return Decision.YES;
}
}