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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.action.support.single.shard;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.Version;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.ActionResponse;
import org.elasticsearch.action.IndicesRequest;
import org.elasticsearch.action.NoShardAvailableActionException;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.IndicesOptions;
import org.elasticsearch.action.support.TransportAction;
import org.elasticsearch.action.support.TransportActions;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.block.ClusterBlockException;
import org.elasticsearch.cluster.block.ClusterBlockLevel;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.cluster.routing.ShardIterator;
import org.elasticsearch.cluster.routing.ShardRouting;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.*;
import java.io.IOException;
import static org.elasticsearch.action.support.TransportActions.isShardNotAvailableException;
/**
* A base class for single shard read operations.
*/
public abstract class TransportShardSingleOperationAction extends TransportAction {
protected final ClusterService clusterService;
protected final TransportService transportService;
final String transportShardAction;
final String executor;
protected TransportShardSingleOperationAction(Settings settings, String actionName, ThreadPool threadPool, ClusterService clusterService, TransportService transportService, ActionFilters actionFilters) {
super(settings, actionName, threadPool, actionFilters);
this.clusterService = clusterService;
this.transportService = transportService;
this.transportShardAction = actionName + "[s]";
this.executor = executor();
if (!isSubAction()) {
transportService.registerHandler(actionName, new TransportHandler());
}
transportService.registerHandler(transportShardAction, new ShardTransportHandler());
}
/**
* Tells whether the action is a main one or a subaction. Used to decide whether we need to register
* the main transport handler. In fact if the action is a subaction, its execute method
* will be called locally to its parent action.
*/
protected boolean isSubAction() {
return false;
}
@Override
protected void doExecute(Request request, ActionListener listener) {
new AsyncSingleAction(request, listener).start();
}
protected abstract String executor();
protected abstract Response shardOperation(Request request, ShardId shardId) throws ElasticsearchException;
protected abstract Request newRequest();
protected abstract Response newResponse();
protected abstract boolean resolveIndex();
protected ClusterBlockException checkGlobalBlock(ClusterState state) {
return state.blocks().globalBlockedException(ClusterBlockLevel.READ);
}
protected ClusterBlockException checkRequestBlock(ClusterState state, InternalRequest request) {
return state.blocks().indexBlockedException(ClusterBlockLevel.READ, request.concreteIndex());
}
protected void resolveRequest(ClusterState state, InternalRequest request) {
}
protected abstract ShardIterator shards(ClusterState state, InternalRequest request) throws ElasticsearchException;
class AsyncSingleAction {
private final ActionListener listener;
private final ShardIterator shardIt;
private final InternalRequest internalRequest;
private final DiscoveryNodes nodes;
private volatile Throwable lastFailure;
private AsyncSingleAction(Request request, ActionListener listener) {
this.listener = listener;
ClusterState clusterState = clusterService.state();
if (logger.isTraceEnabled()) {
logger.trace("executing [{}] based on cluster state version [{}]", request, clusterState.version());
}
nodes = clusterState.nodes();
ClusterBlockException blockException = checkGlobalBlock(clusterState);
if (blockException != null) {
throw blockException;
}
String concreteSingleIndex;
if (resolveIndex()) {
concreteSingleIndex = clusterState.metaData().concreteSingleIndex(request.index(), request.indicesOptions());
} else {
concreteSingleIndex = request.index();
}
this.internalRequest = new InternalRequest(request, concreteSingleIndex);
resolveRequest(clusterState, internalRequest);
blockException = checkRequestBlock(clusterState, internalRequest);
if (blockException != null) {
throw blockException;
}
this.shardIt = shards(clusterState, internalRequest);
}
public void start() {
perform(null);
}
private void onFailure(ShardRouting shardRouting, Throwable e) {
if (logger.isTraceEnabled() && e != null) {
logger.trace("{}: failed to execute [{}]", e, shardRouting, internalRequest.request());
}
perform(e);
}
private void perform(@Nullable final Throwable currentFailure) {
Throwable lastFailure = this.lastFailure;
if (lastFailure == null || TransportActions.isReadOverrideException(currentFailure)) {
lastFailure = currentFailure;
this.lastFailure = currentFailure;
}
final ShardRouting shardRouting = shardIt.nextOrNull();
if (shardRouting == null) {
Throwable failure = lastFailure;
if (failure == null || isShardNotAvailableException(failure)) {
failure = new NoShardAvailableActionException(shardIt.shardId(), null, failure);
} else {
if (logger.isDebugEnabled()) {
logger.debug("{}: failed to execute [{}]", failure, shardIt.shardId(), internalRequest.request());
}
}
listener.onFailure(failure);
return;
}
if (shardRouting.currentNodeId().equals(nodes.localNodeId())) {
if (logger.isTraceEnabled()) {
logger.trace("executing [{}] on shard [{}]", internalRequest.request(), shardRouting.shardId());
}
try {
if (internalRequest.request().operationThreaded()) {
threadPool.executor(executor).execute(new Runnable() {
@Override
public void run() {
try {
Response response = shardOperation(internalRequest.request(), shardRouting.shardId());
listener.onResponse(response);
} catch (Throwable e) {
onFailure(shardRouting, e);
}
}
});
} else {
final Response response = shardOperation(internalRequest.request(), shardRouting.shardId());
listener.onResponse(response);
}
} catch (Throwable e) {
onFailure(shardRouting, e);
}
} else {
DiscoveryNode node = nodes.get(shardRouting.currentNodeId());
if (node == null) {
onFailure(shardRouting, new NoShardAvailableActionException(shardIt.shardId()));
} else {
transportService.sendRequest(node, transportShardAction, new ShardSingleOperationRequest(internalRequest.request(), shardRouting.shardId()), new BaseTransportResponseHandler() {
@Override
public Response newInstance() {
return newResponse();
}
@Override
public String executor() {
return ThreadPool.Names.SAME;
}
@Override
public void handleResponse(final Response response) {
listener.onResponse(response);
}
@Override
public void handleException(TransportException exp) {
onFailure(shardRouting, exp);
}
});
}
}
}
}
private class TransportHandler extends BaseTransportRequestHandler {
@Override
public Request newInstance() {
return newRequest();
}
@Override
public String executor() {
return ThreadPool.Names.SAME;
}
@Override
public void messageReceived(Request request, final TransportChannel channel) throws Exception {
// no need to have a threaded listener since we just send back a response
request.listenerThreaded(false);
// if we have a local operation, execute it on a thread since we don't spawn
request.operationThreaded(true);
execute(request, new ActionListener() {
@Override
public void onResponse(Response result) {
try {
channel.sendResponse(result);
} catch (Throwable e) {
onFailure(e);
}
}
@Override
public void onFailure(Throwable e) {
try {
channel.sendResponse(e);
} catch (Exception e1) {
logger.warn("failed to send response for get", e1);
}
}
});
}
}
private class ShardTransportHandler extends BaseTransportRequestHandler {
@Override
public ShardSingleOperationRequest newInstance() {
return new ShardSingleOperationRequest();
}
@Override
public String executor() {
return executor;
}
@Override
public void messageReceived(final ShardSingleOperationRequest request, final TransportChannel channel) throws Exception {
if (logger.isTraceEnabled()) {
logger.trace("executing [{}] on shard [{}]", request.request(), request.shardId());
}
Response response = shardOperation(request.request(), request.shardId());
channel.sendResponse(response);
}
}
class ShardSingleOperationRequest extends TransportRequest implements IndicesRequest {
private Request request;
private ShardId shardId;
ShardSingleOperationRequest() {
}
ShardSingleOperationRequest(Request request, ShardId shardId) {
super(request);
this.request = request;
this.shardId = shardId;
}
public Request request() {
return request;
}
public ShardId shardId() {
return shardId;
}
@Override
public String[] indices() {
return request.indices();
}
@Override
public IndicesOptions indicesOptions() {
return request.indicesOptions();
}
@Override
public void readFrom(StreamInput in) throws IOException {
super.readFrom(in);
request = newRequest();
request.readFrom(in);
if (in.getVersion().onOrAfter(Version.V_1_4_0_Beta1)) {
shardId = ShardId.readShardId(in);
} else {
//older nodes will send the concrete index as part of the request
shardId = new ShardId(request.index(), in.readVInt());
}
}
@Override
public void writeTo(StreamOutput out) throws IOException {
super.writeTo(out);
if (out.getVersion().before(Version.V_1_4_0_Beta1)) {
//older nodes expect the concrete index as part of the request
request.index(shardId.getIndex());
}
request.writeTo(out);
if (out.getVersion().onOrAfter(Version.V_1_4_0_Beta1)) {
shardId.writeTo(out);
} else {
out.writeVInt(shardId.id());
}
}
}
/**
* Internal request class that gets built on each node. Holds the original request plus additional info.
*/
protected class InternalRequest {
final Request request;
final String concreteIndex;
InternalRequest(Request request, String concreteIndex) {
this.request = request;
this.concreteIndex = concreteIndex;
}
public Request request() {
return request;
}
public String concreteIndex() {
return concreteIndex;
}
}
}