org.elasticsearch.cluster.routing.allocation.decider.AllocationDeciders Maven / Gradle / Ivy
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* Licensed to ElasticSearch and Shay Banon under one
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* 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 com.google.common.collect.ImmutableSet;
import org.elasticsearch.cluster.routing.RoutingNode;
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 org.elasticsearch.node.settings.NodeSettingsService;
import java.util.Set;
/**
* A composite {@link AllocationDecider} combining the "decision" of multiple
* {@link AllocationDecider} implementations into a single allocation decision.
*/
public class AllocationDeciders extends AllocationDecider {
private final AllocationDecider[] allocations;
/**
* Create a new {@link AllocationDeciders} instance
* @param settings settings to use
* @param nodeSettingsService per-node settings to use
*/
public AllocationDeciders(Settings settings, NodeSettingsService nodeSettingsService) {
this(settings, ImmutableSet.builder()
.add(new SameShardAllocationDecider(settings))
.add(new FilterAllocationDecider(settings, nodeSettingsService))
.add(new ReplicaAfterPrimaryActiveAllocationDecider(settings))
.add(new ThrottlingAllocationDecider(settings, nodeSettingsService))
.add(new RebalanceOnlyWhenActiveAllocationDecider(settings))
.add(new ClusterRebalanceAllocationDecider(settings))
.add(new ConcurrentRebalanceAllocationDecider(settings, nodeSettingsService))
.add(new DisableAllocationDecider(settings, nodeSettingsService))
.add(new AwarenessAllocationDecider(settings, nodeSettingsService))
.add(new ShardsLimitAllocationDecider(settings))
.build()
);
}
@Inject
public AllocationDeciders(Settings settings, Set allocations) {
super(settings);
this.allocations = allocations.toArray(new AllocationDecider[allocations.size()]);
}
@Override
public Decision canRebalance(ShardRouting shardRouting, RoutingAllocation allocation) {
Decision.Multi ret = new Decision.Multi();
for (AllocationDecider allocationDecider : allocations) {
Decision decision = allocationDecider.canRebalance(shardRouting, allocation);
if (decision != Decision.ALWAYS) {
ret.add(decision);
}
}
return ret;
}
@Override
public Decision canAllocate(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation) {
if (allocation.shouldIgnoreShardForNode(shardRouting.shardId(), node.nodeId())) {
return Decision.NO;
}
Decision.Multi ret = new Decision.Multi();
for (AllocationDecider allocationDecider : allocations) {
Decision decision = allocationDecider.canAllocate(shardRouting, node, allocation);
// the assumption is that a decider that returns the static instance Decision#ALWAYS
// does not really implements canAllocate
if (decision != Decision.ALWAYS) {
ret.add(decision);
}
}
return ret;
}
@Override
public Decision canRemain(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation) {
if (allocation.shouldIgnoreShardForNode(shardRouting.shardId(), node.nodeId())) {
return Decision.NO;
}
Decision.Multi ret = new Decision.Multi();
for (AllocationDecider allocationDecider : allocations) {
Decision decision = allocationDecider.canRemain(shardRouting, node, allocation);
if (decision != Decision.ALWAYS) {
ret.add(decision);
}
}
return ret;
}
}