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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.action.admin.indices.shrink.ResizeAction;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.cluster.routing.RecoverySource;
import org.elasticsearch.cluster.routing.RoutingNode;
import org.elasticsearch.cluster.routing.ShardRouting;
import org.elasticsearch.cluster.routing.UnassignedInfo;
import org.elasticsearch.cluster.routing.allocation.RoutingAllocation;
import org.elasticsearch.index.Index;
import org.elasticsearch.index.shard.ShardId;
/**
* An allocation decider that ensures we allocate the shards of a target index for resize operations next to the source primaries
*/
public class ResizeAllocationDecider extends AllocationDecider {
public static final String NAME = "resize";
@Override
public Decision canAllocate(ShardRouting shardRouting, RoutingAllocation allocation) {
return canAllocate(shardRouting, null, allocation);
}
@Override
public Decision canAllocate(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation) {
final UnassignedInfo unassignedInfo = shardRouting.unassignedInfo();
if (unassignedInfo != null && shardRouting.recoverySource().getType() == RecoverySource.Type.LOCAL_SHARDS) {
// we only make decisions here if we have an unassigned info and we have to recover from another index ie. split / shrink
final IndexMetaData indexMetaData = allocation.metaData().getIndexSafe(shardRouting.index());
Index resizeSourceIndex = indexMetaData.getResizeSourceIndex();
assert resizeSourceIndex != null;
if (allocation.metaData().index(resizeSourceIndex) == null) {
return allocation.decision(Decision.NO, NAME, "resize source index [%s] doesn't exists", resizeSourceIndex.toString());
}
IndexMetaData sourceIndexMetaData = allocation.metaData().getIndexSafe(resizeSourceIndex);
if (indexMetaData.getNumberOfShards() < sourceIndexMetaData.getNumberOfShards()) {
// this only handles splits and clone so far.
return Decision.ALWAYS;
}
ShardId shardId = indexMetaData.getNumberOfShards() == sourceIndexMetaData.getNumberOfShards() ?
IndexMetaData.selectCloneShard(shardRouting.id(), sourceIndexMetaData, indexMetaData.getNumberOfShards()) :
IndexMetaData.selectSplitShard(shardRouting.id(), sourceIndexMetaData, indexMetaData.getNumberOfShards());
ShardRouting sourceShardRouting = allocation.routingNodes().activePrimary(shardId);
if (sourceShardRouting == null) {
return allocation.decision(Decision.NO, NAME, "source primary shard [%s] is not active", shardId);
}
if (node != null) { // we might get called from the 2 param canAllocate method..
if (node.node().getVersion().before(ResizeAction.COMPATIBILITY_VERSION)) {
return allocation.decision(Decision.NO, NAME, "node [%s] is too old to split a shard", node.nodeId());
}
if (sourceShardRouting.currentNodeId().equals(node.nodeId())) {
return allocation.decision(Decision.YES, NAME, "source primary is allocated on this node");
} else {
return allocation.decision(Decision.NO, NAME, "source primary is allocated on another node");
}
} else {
return allocation.decision(Decision.YES, NAME, "source primary is active");
}
}
return super.canAllocate(shardRouting, node, allocation);
}
@Override
public Decision canForceAllocatePrimary(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation) {
assert shardRouting.primary() : "must not call canForceAllocatePrimary on a non-primary shard " + shardRouting;
return canAllocate(shardRouting, node, allocation);
}
}