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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.command;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.routing.RoutingNode;
import org.elasticsearch.cluster.routing.RoutingNodes;
import org.elasticsearch.cluster.routing.ShardRouting;
import org.elasticsearch.cluster.routing.UnassignedInfo;
import org.elasticsearch.cluster.routing.allocation.RerouteExplanation;
import org.elasticsearch.cluster.routing.allocation.RoutingAllocation;
import org.elasticsearch.cluster.routing.allocation.decider.Decision;
import org.elasticsearch.common.xcontent.ObjectParser;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.IndexNotFoundException;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.index.shard.ShardNotFoundException;
import java.io.IOException;
/**
* Allocates an unassigned empty primary shard to a specific node. Use with extreme care as this will result in data loss.
* Allocation deciders are ignored.
*/
public class AllocateEmptyPrimaryAllocationCommand extends BasePrimaryAllocationCommand {
public static final String NAME = "allocate_empty_primary";
private static final ObjectParser<Builder, Void> EMPTY_PRIMARY_PARSER = BasePrimaryAllocationCommand.createAllocatePrimaryParser(NAME);
/**
* Creates a new {@link AllocateEmptyPrimaryAllocationCommand}
*
* @param shardId {@link ShardId} of the shard to assign
* @param node node id of the node to assign the shard to
* @param acceptDataLoss whether the user agrees to data loss
*/
public AllocateEmptyPrimaryAllocationCommand(ShardId shardId, String node, boolean acceptDataLoss) {
super(shardId, node, acceptDataLoss);
}
@Override
public String name() {
return NAME;
}
public static class Builder extends BasePrimaryAllocationCommand.Builder<AllocateEmptyPrimaryAllocationCommand> {
@Override
public Builder parse(XContentParser parser) throws IOException {
return EMPTY_PRIMARY_PARSER.parse(parser, this);
}
@Override
public AllocateEmptyPrimaryAllocationCommand build() {
validate();
return new AllocateEmptyPrimaryAllocationCommand(new ShardId(index, shard), node, acceptDataLoss);
}
}
public static class Factory extends AbstractAllocateAllocationCommand.Factory<AllocateEmptyPrimaryAllocationCommand> {
@Override
protected Builder newBuilder() {
return new Builder();
}
}
@Override
public RerouteExplanation execute(RoutingAllocation allocation, boolean explain) {
final DiscoveryNode discoNode;
try {
discoNode = allocation.nodes().resolveNode(node);
} catch (IllegalArgumentException e) {
return explainOrThrowRejectedCommand(explain, allocation, e);
}
final RoutingNodes routingNodes = allocation.routingNodes();
RoutingNode routingNode = routingNodes.node(discoNode.id());
if (routingNode == null) {
return explainOrThrowMissingRoutingNode(allocation, explain, discoNode);
}
final ShardRouting shardRouting;
try {
shardRouting = allocation.routingTable().shardRoutingTable(shardId).primaryShard();
} catch (IndexNotFoundException | ShardNotFoundException e) {
return explainOrThrowRejectedCommand(explain, allocation, e);
}
if (shardRouting.unassigned() == false) {
return explainOrThrowRejectedCommand(explain, allocation, "primary " + shardId + " is already assigned");
}
if (shardRouting.unassignedInfo().getReason() != UnassignedInfo.Reason.INDEX_CREATED && acceptDataLoss == false) {
return explainOrThrowRejectedCommand(explain, allocation,
"allocating an empty primary for " + shardId + " can result in data loss. Please confirm by setting the accept_data_loss parameter to true");
}
initializeUnassignedShard(allocation, routingNodes, routingNode, shardRouting,
shr -> {
if (shr.unassignedInfo().getReason() != UnassignedInfo.Reason.INDEX_CREATED) {
// we need to move the unassigned info back to treat it as if it was index creation
shr.updateUnassignedInfo(new UnassignedInfo(UnassignedInfo.Reason.INDEX_CREATED,
"force empty allocation from previous reason " + shardRouting.unassignedInfo().getReason() + ", " + shardRouting.unassignedInfo().getMessage(),
shardRouting.unassignedInfo().getFailure(), System.nanoTime(), System.currentTimeMillis()));
}
});
return new RerouteExplanation(this, allocation.decision(Decision.YES, name() + " (allocation command)", "ignore deciders"));
}
}
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