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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.ElasticsearchParseException;
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.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.shard.ShardId;
import java.io.IOException;
import static org.elasticsearch.cluster.routing.ShardRoutingState.RELOCATING;
/**
* A command that cancels relocation, or recovery of a given shard on a node.
*/
public class CancelAllocationCommand implements AllocationCommand {
public static final String NAME = "cancel";
/**
* Factory creating {@link CancelAllocationCommand}s
*/
public static class Factory implements AllocationCommand.Factory<CancelAllocationCommand> {
@Override
public CancelAllocationCommand readFrom(StreamInput in) throws IOException {
return new CancelAllocationCommand(ShardId.readShardId(in), in.readString(), in.readBoolean());
}
@Override
public void writeTo(CancelAllocationCommand command, StreamOutput out) throws IOException {
command.shardId().writeTo(out);
out.writeString(command.node());
out.writeBoolean(command.allowPrimary());
}
@Override
public CancelAllocationCommand fromXContent(XContentParser parser) throws IOException {
String index = null;
int shardId = -1;
String nodeId = null;
boolean allowPrimary = false;
String currentFieldName = null;
XContentParser.Token token;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token.isValue()) {
if ("index".equals(currentFieldName)) {
index = parser.text();
} else if ("shard".equals(currentFieldName)) {
shardId = parser.intValue();
} else if ("node".equals(currentFieldName)) {
nodeId = parser.text();
} else if ("allow_primary".equals(currentFieldName) || "allowPrimary".equals(currentFieldName)) {
allowPrimary = parser.booleanValue();
} else {
throw new ElasticsearchParseException("[{}] command does not support field [{}]", NAME, currentFieldName);
}
} else {
throw new ElasticsearchParseException("[{}] command does not support complex json tokens [{}]", NAME, token);
}
}
if (index == null) {
throw new ElasticsearchParseException("[{}] command missing the index parameter", NAME);
}
if (shardId == -1) {
throw new ElasticsearchParseException("[{}] command missing the shard parameter", NAME);
}
if (nodeId == null) {
throw new ElasticsearchParseException("[{}] command missing the node parameter", NAME);
}
return new CancelAllocationCommand(new ShardId(index, shardId), nodeId, allowPrimary);
}
@Override
public void toXContent(CancelAllocationCommand command, XContentBuilder builder, ToXContent.Params params, String objectName) throws IOException {
if (objectName == null) {
builder.startObject();
} else {
builder.startObject(objectName);
}
builder.field("index", command.shardId().index().name());
builder.field("shard", command.shardId().id());
builder.field("node", command.node());
builder.field("allow_primary", command.allowPrimary());
builder.endObject();
}
}
private final ShardId shardId;
private final String node;
private final boolean allowPrimary;
/**
* Creates a new {@link CancelAllocationCommand}
*
* @param shardId id of the shard which allocation should be canceled
* @param node id of the node that manages the shard which allocation should be canceled
*/
public CancelAllocationCommand(ShardId shardId, String node, boolean allowPrimary) {
this.shardId = shardId;
this.node = node;
this.allowPrimary = allowPrimary;
}
@Override
public String name() {
return NAME;
}
/**
* Get the id of the shard which allocation should be canceled
* @return id of the shard which allocation should be canceled
*/
public ShardId shardId() {
return this.shardId;
}
/**
* Get the id of the node that manages the shard which allocation should be canceled
* @return id of the node that manages the shard which allocation should be canceled
*/
public String node() {
return this.node;
}
public boolean allowPrimary() {
return this.allowPrimary;
}
@Override
public RerouteExplanation execute(RoutingAllocation allocation, boolean explain) {
DiscoveryNode discoNode = allocation.nodes().resolveNode(node);
boolean found = false;
for (RoutingNodes.RoutingNodeIterator it = allocation.routingNodes().routingNodeIter(discoNode.id()); it.hasNext(); ) {
ShardRouting shardRouting = it.next();
if (!shardRouting.shardId().equals(shardId)) {
continue;
}
found = true;
if (shardRouting.relocatingNodeId() != null) {
if (shardRouting.initializing()) {
// the shard is initializing and recovering from another node, simply cancel the recovery
it.remove();
// and cancel the relocating state from the shard its being relocated from
RoutingNode relocatingFromNode = allocation.routingNodes().node(shardRouting.relocatingNodeId());
if (relocatingFromNode != null) {
for (ShardRouting fromShardRouting : relocatingFromNode) {
if (fromShardRouting.isSameShard(shardRouting) && fromShardRouting.state() == RELOCATING) {
allocation.routingNodes().cancelRelocation(fromShardRouting);
break;
}
}
}
} else if (shardRouting.relocating()) {
// the shard is relocating to another node, cancel the recovery on the other node, and deallocate this one
if (!allowPrimary && shardRouting.primary()) {
// can't cancel a primary shard being initialized
if (explain) {
return new RerouteExplanation(this, allocation.decision(Decision.NO, "cancel_allocation_command",
"can't cancel " + shardId + " on node " + discoNode + ", shard is primary and initializing its state"));
}
throw new IllegalArgumentException("[cancel_allocation] can't cancel " + shardId + " on node " +
discoNode + ", shard is primary and initializing its state");
}
it.moveToUnassigned(new UnassignedInfo(UnassignedInfo.Reason.REROUTE_CANCELLED, null));
// now, go and find the shard that is initializing on the target node, and cancel it as well...
RoutingNodes.RoutingNodeIterator initializingNode = allocation.routingNodes().routingNodeIter(shardRouting.relocatingNodeId());
if (initializingNode != null) {
while (initializingNode.hasNext()) {
ShardRouting initializingShardRouting = initializingNode.next();
if (initializingShardRouting.isRelocationTargetOf(shardRouting)) {
initializingNode.remove();
}
}
}
}
} else {
// the shard is not relocating, its either started, or initializing, just cancel it and move on...
if (!allowPrimary && shardRouting.primary()) {
// can't cancel a primary shard being initialized
if (explain) {
return new RerouteExplanation(this, allocation.decision(Decision.NO, "cancel_allocation_command",
"can't cancel " + shardId + " on node " + discoNode + ", shard is primary and started"));
}
throw new IllegalArgumentException("[cancel_allocation] can't cancel " + shardId + " on node " +
discoNode + ", shard is primary and started");
}
it.moveToUnassigned(new UnassignedInfo(UnassignedInfo.Reason.REROUTE_CANCELLED, null));
}
}
if (!found) {
if (explain) {
return new RerouteExplanation(this, allocation.decision(Decision.NO, "cancel_allocation_command",
"can't cancel " + shardId + ", failed to find it on node " + discoNode));
}
throw new IllegalArgumentException("[cancel_allocation] can't cancel " + shardId + ", failed to find it on node " + discoNode);
}
return new RerouteExplanation(this, allocation.decision(Decision.YES, "cancel_allocation_command",
"shard " + shardId + " on node " + discoNode + " can be cancelled"));
}
}