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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.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;
/**
* A command that moves a shard from a specific node to another node.
* Note: The shard needs to be in the state
* {@link ShardRoutingState#STARTED} in order to be moved.
*/
public class MoveAllocationCommand implements AllocationCommand {
public static final String NAME = "move";
public static class Factory implements AllocationCommand.Factory {
@Override
public MoveAllocationCommand readFrom(StreamInput in) throws IOException {
return new MoveAllocationCommand(ShardId.readShardId(in), in.readString(), in.readString());
}
@Override
public void writeTo(MoveAllocationCommand command, StreamOutput out) throws IOException {
command.shardId().writeTo(out);
out.writeString(command.fromNode());
out.writeString(command.toNode());
}
@Override
public MoveAllocationCommand fromXContent(XContentParser parser) throws IOException {
String index = null;
int shardId = -1;
String fromNode = null;
String toNode = null;
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 ("from_node".equals(currentFieldName) || "fromNode".equals(currentFieldName)) {
fromNode = parser.text();
} else if ("to_node".equals(currentFieldName) || "toNode".equals(currentFieldName)) {
toNode = parser.text();
} else {
throw new ElasticSearchParseException("[move] command does not support field [" + currentFieldName + "]");
}
} else {
throw new ElasticSearchParseException("[move] command does not support complex json tokens [" + token + "]");
}
}
if (index == null) {
throw new ElasticSearchParseException("[move] command missing the index parameter");
}
if (shardId == -1) {
throw new ElasticSearchParseException("[move] command missing the shard parameter");
}
if (fromNode == null) {
throw new ElasticSearchParseException("[move] command missing the from_node parameter");
}
if (toNode == null) {
throw new ElasticSearchParseException("[move] command missing the to_node parameter");
}
return new MoveAllocationCommand(new ShardId(index, shardId), fromNode, toNode);
}
@Override
public void toXContent(MoveAllocationCommand command, XContentBuilder builder, ToXContent.Params params) throws IOException {
builder.startObject();
builder.field("index", command.shardId().index());
builder.field("shard", command.shardId().id());
builder.field("from_node", command.fromNode());
builder.field("to_node", command.toNode());
builder.endObject();
}
}
private final ShardId shardId;
private final String fromNode;
private final String toNode;
public MoveAllocationCommand(ShardId shardId, String fromNode, String toNode) {
this.shardId = shardId;
this.fromNode = fromNode;
this.toNode = toNode;
}
@Override
public String name() {
return NAME;
}
public ShardId shardId() {
return this.shardId;
}
public String fromNode() {
return this.fromNode;
}
public String toNode() {
return this.toNode;
}
@Override
public void execute(RoutingAllocation allocation) throws ElasticSearchException {
DiscoveryNode fromDiscoNode = allocation.nodes().resolveNode(fromNode);
DiscoveryNode toDiscoNode = allocation.nodes().resolveNode(toNode);
boolean found = false;
for (MutableShardRouting shardRouting : allocation.routingNodes().node(fromDiscoNode.id())) {
if (!shardRouting.shardId().equals(shardId)) {
continue;
}
found = true;
// TODO we can possibly support also relocating cases, where we cancel relocation and move...
if (!shardRouting.started()) {
throw new ElasticSearchIllegalArgumentException("[move_allocation] can't move " + shardId + ", shard is not started (state = " + shardRouting.state() + "]");
}
RoutingNode toRoutingNode = allocation.routingNodes().node(toDiscoNode.id());
Decision decision = allocation.deciders().canAllocate(shardRouting, toRoutingNode, allocation);
if (decision.type() == Decision.Type.NO) {
throw new ElasticSearchIllegalArgumentException("[move_allocation] can't move " + shardId + ", from " + fromDiscoNode + ", to " + toDiscoNode + ", since its not allowed, reason: " + decision);
}
if (decision.type() == Decision.Type.THROTTLE) {
// its being throttled, maybe have a flag to take it into account and fail? for now, just do it since the "user" wants it...
}
toRoutingNode.add(new MutableShardRouting(shardRouting.index(), shardRouting.id(),
toRoutingNode.nodeId(), shardRouting.currentNodeId(),
shardRouting.primary(), ShardRoutingState.INITIALIZING, shardRouting.version() + 1));
shardRouting.relocate(toRoutingNode.nodeId());
}
if (!found) {
throw new ElasticSearchIllegalArgumentException("[move_allocation] can't move " + shardId + ", failed to find it on node " + fromDiscoNode);
}
}
}
