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/*
* 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.command;
import org.elasticsearch.ElasticSearchException;
import org.elasticsearch.ElasticSearchIllegalArgumentException;
import org.elasticsearch.ElasticSearchParseException;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.routing.MutableShardRouting;
import org.elasticsearch.cluster.routing.RoutingNode;
import org.elasticsearch.cluster.routing.ShardRoutingState;
import org.elasticsearch.cluster.routing.allocation.RoutingAllocation;
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 java.util.Iterator;
import static org.elasticsearch.cluster.routing.ShardRoutingState.INITIALIZING;
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 {
@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("[cancel] command does not support field [" + currentFieldName + "]");
}
} else {
throw new ElasticSearchParseException("[cancel] command does not support complex json tokens [" + token + "]");
}
}
if (index == null) {
throw new ElasticSearchParseException("[cancel] command missing the index parameter");
}
if (shardId == -1) {
throw new ElasticSearchParseException("[cancel] command missing the shard parameter");
}
if (nodeId == null) {
throw new ElasticSearchParseException("[cancel] command missing the node parameter");
}
return new CancelAllocationCommand(new ShardId(index, shardId), nodeId, allowPrimary);
}
@Override
public void toXContent(CancelAllocationCommand command, XContentBuilder builder, ToXContent.Params params) throws IOException {
builder.startObject();
builder.field("index", command.shardId().index());
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
* @param allowPrimary
*/
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 void execute(RoutingAllocation allocation) throws ElasticSearchException {
DiscoveryNode discoNode = allocation.nodes().resolveNode(node);
boolean found = false;
for (Iterator it = allocation.routingNodes().node(discoNode.id()).iterator(); it.hasNext(); ) {
MutableShardRouting 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();
shardRouting.deassignNode();
// and cancel the relocating state from the shard its being relocated from
RoutingNode relocatingFromNode = allocation.routingNodes().node(shardRouting.relocatingNodeId());
if (relocatingFromNode != null) {
for (MutableShardRouting fromShardRouting : relocatingFromNode) {
if (fromShardRouting.shardId().equals(shardRouting.shardId()) && shardRouting.state() == RELOCATING) {
fromShardRouting.cancelRelocation();
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
throw new ElasticSearchIllegalArgumentException("[cancel_allocation] can't cancel " + shardId + " on node " + discoNode + ", shard is primary and initializing its state");
}
it.remove();
allocation.routingNodes().unassigned().add(new MutableShardRouting(shardRouting.index(), shardRouting.id(),
null, shardRouting.primary(), ShardRoutingState.UNASSIGNED, shardRouting.version() + 1));
// now, go and find the shard that is initializing on the target node, and cancel it as well...
RoutingNode initializingNode = allocation.routingNodes().node(shardRouting.relocatingNodeId());
if (initializingNode != null) {
for (Iterator itX = initializingNode.iterator(); itX.hasNext(); ) {
MutableShardRouting initializingShardRouting = itX.next();
if (initializingShardRouting.shardId().equals(shardRouting.shardId()) && initializingShardRouting.state() == INITIALIZING) {
shardRouting.deassignNode();
itX.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
throw new ElasticSearchIllegalArgumentException("[cancel_allocation] can't cancel " + shardId + " on node " + discoNode + ", shard is primary and started");
}
it.remove();
allocation.routingNodes().unassigned().add(new MutableShardRouting(shardRouting.index(), shardRouting.id(),
null, shardRouting.primary(), ShardRoutingState.UNASSIGNED, shardRouting.version() + 1));
}
}
if (!found) {
throw new ElasticSearchIllegalArgumentException("[cancel_allocation] can't cancel " + shardId + ", failed to find it on node " + discoNode);
}
}
}
