
org.elasticsearch.cluster.routing.allocation.decider.RebalanceOnlyWhenActiveAllocationDecider Maven / Gradle / Ivy
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.cluster.routing.allocation.decider;
import org.elasticsearch.cluster.routing.ShardRouting;
import org.elasticsearch.cluster.routing.allocation.RoutingAllocation;
/**
* 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";
static final Decision YES_ALL_REPLICAS_ACTIVE = Decision.single(
Decision.Type.YES,
NAME,
"rebalancing is allowed as all copies of this shard are active"
);
static final Decision NO_SOME_REPLICAS_INACTIVE = Decision.single(
Decision.Type.NO,
NAME,
"rebalancing is not allowed until all copies of this shard are active"
);
@Override
public Decision canRebalance(ShardRouting shardRouting, RoutingAllocation allocation) {
return allocation.routingNodes().allShardsActive(shardRouting.shardId(), allocation.metadata())
? YES_ALL_REPLICAS_ACTIVE
: NO_SOME_REPLICAS_INACTIVE;
}
}
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