org.elasticsearch.cluster.routing.allocation.decider.DisableAllocationDecider Maven / Gradle / Ivy
/*
* Licensed to ElasticSearch and Shay Banon 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.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;
/**
* This {@link AllocationDecider} prevents cluster-wide shard allocations. The
* behavior of this {@link AllocationDecider} can be changed in real-time via
* the cluster settings API. It respects the following settings:
*
* - cluster.routing.allocation.disable_new_allocation - if set to
*
true no new shard-allocation are allowed. Note: this setting is
* only applied if the allocated shard is a primary and it has not been
* allocated before the this setting was applied.
*
* - cluster.routing.allocation.disable_allocation - if set to
*
true cluster wide allocations are disabled
*
* - cluster.routing.allocation.disable_replica_allocation - if set
* to
true cluster wide replica allocations are disabled while
* primary shards can still be allocated
*
*
*
* Note: all of the above settings might be ignored if the allocation happens on
* a shard that explicitly ignores disabled allocations via
* {@link RoutingAllocation#ignoreDisable()}. Which is set if allocation are
* explicit.
*
*/
public class DisableAllocationDecider extends AllocationDecider {
public static final String CLUSTER_ROUTING_ALLOCATION_DISABLE_NEW_ALLOCATION = "cluster.routing.allocation.disable_new_allocation";
public static final String CLUSTER_ROUTING_ALLOCATION_DISABLE_ALLOCATION = "cluster.routing.allocation.disable_allocation";
public static final String CLUSTER_ROUTING_ALLOCATION_DISABLE_REPLICA_ALLOCATION = "cluster.routing.allocation.disable_replica_allocation";
public static final String INDEX_ROUTING_ALLOCATION_DISABLE_NEW_ALLOCATION = "index.routing.allocation.disable_new_allocation";
public static final String INDEX_ROUTING_ALLOCATION_DISABLE_ALLOCATION = "index.routing.allocation.disable_allocation";
public static final String INDEX_ROUTING_ALLOCATION_DISABLE_REPLICA_ALLOCATION = "index.routing.allocation.disable_replica_allocation";
class ApplySettings implements NodeSettingsService.Listener {
@Override
public void onRefreshSettings(Settings settings) {
boolean disableNewAllocation = settings.getAsBoolean(CLUSTER_ROUTING_ALLOCATION_DISABLE_NEW_ALLOCATION, DisableAllocationDecider.this.disableNewAllocation);
if (disableNewAllocation != DisableAllocationDecider.this.disableNewAllocation) {
logger.info("updating [cluster.routing.allocation.disable_new_allocation] from [{}] to [{}]", DisableAllocationDecider.this.disableNewAllocation, disableNewAllocation);
DisableAllocationDecider.this.disableNewAllocation = disableNewAllocation;
}
boolean disableAllocation = settings.getAsBoolean(CLUSTER_ROUTING_ALLOCATION_DISABLE_ALLOCATION, DisableAllocationDecider.this.disableAllocation);
if (disableAllocation != DisableAllocationDecider.this.disableAllocation) {
logger.info("updating [cluster.routing.allocation.disable_allocation] from [{}] to [{}]", DisableAllocationDecider.this.disableAllocation, disableAllocation);
DisableAllocationDecider.this.disableAllocation = disableAllocation;
}
boolean disableReplicaAllocation = settings.getAsBoolean(CLUSTER_ROUTING_ALLOCATION_DISABLE_REPLICA_ALLOCATION, DisableAllocationDecider.this.disableReplicaAllocation);
if (disableReplicaAllocation != DisableAllocationDecider.this.disableReplicaAllocation) {
logger.info("updating [cluster.routing.allocation.disable_replica_allocation] from [{}] to [{}]", DisableAllocationDecider.this.disableReplicaAllocation, disableReplicaAllocation);
DisableAllocationDecider.this.disableReplicaAllocation = disableReplicaAllocation;
}
}
}
private volatile boolean disableNewAllocation;
private volatile boolean disableAllocation;
private volatile boolean disableReplicaAllocation;
@Inject
public DisableAllocationDecider(Settings settings, NodeSettingsService nodeSettingsService) {
super(settings);
this.disableNewAllocation = settings.getAsBoolean(CLUSTER_ROUTING_ALLOCATION_DISABLE_NEW_ALLOCATION, false);
this.disableAllocation = settings.getAsBoolean(CLUSTER_ROUTING_ALLOCATION_DISABLE_ALLOCATION, false);
this.disableReplicaAllocation = settings.getAsBoolean(CLUSTER_ROUTING_ALLOCATION_DISABLE_REPLICA_ALLOCATION, false);
nodeSettingsService.addListener(new ApplySettings());
}
@Override
public Decision canAllocate(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation) {
if (allocation.ignoreDisable()) {
return Decision.YES;
}
Settings indexSettings = allocation.routingNodes().metaData().index(shardRouting.index()).settings();
if (shardRouting.primary() && !allocation.routingNodes().routingTable().index(shardRouting.index()).shard(shardRouting.id()).primaryAllocatedPostApi()) {
// if its primary, and it hasn't been allocated post API (meaning its a "fresh newly created shard"), only disable allocation
// on a special disable allocation flag
return indexSettings.getAsBoolean(INDEX_ROUTING_ALLOCATION_DISABLE_NEW_ALLOCATION, disableNewAllocation) ? Decision.NO : Decision.YES;
}
if (indexSettings.getAsBoolean(INDEX_ROUTING_ALLOCATION_DISABLE_ALLOCATION, disableAllocation)) {
return Decision.NO;
}
if (indexSettings.getAsBoolean(INDEX_ROUTING_ALLOCATION_DISABLE_REPLICA_ALLOCATION, disableReplicaAllocation)) {
return shardRouting.primary() ? Decision.YES : Decision.NO;
}
return Decision.YES;
}
}