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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.action.support.single.instance;
import org.elasticsearch.ElasticSearchException;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.ActionResponse;
import org.elasticsearch.action.UnavailableShardsException;
import org.elasticsearch.action.support.TransportAction;
import org.elasticsearch.cluster.ClusterChangedEvent;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.TimeoutClusterStateListener;
import org.elasticsearch.cluster.block.ClusterBlockException;
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.settings.Settings;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.node.NodeClosedException;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.*;
import java.util.concurrent.atomic.AtomicBoolean;
/**
*
*/
public abstract class TransportInstanceSingleOperationAction extends TransportAction {
protected final ClusterService clusterService;
protected final TransportService transportService;
final String transportAction;
final String executor;
protected TransportInstanceSingleOperationAction(Settings settings, ThreadPool threadPool, ClusterService clusterService, TransportService transportService) {
super(settings, threadPool);
this.clusterService = clusterService;
this.transportService = transportService;
this.transportAction = transportAction();
this.executor = executor();
transportService.registerHandler(transportAction, new TransportHandler());
}
@Override
protected void doExecute(Request request, ActionListener listener) {
new AsyncSingleAction(request, listener).start();
}
protected abstract String executor();
protected abstract String transportAction();
protected abstract void shardOperation(Request request, ActionListener listener) throws ElasticSearchException;
protected abstract Request newRequest();
protected abstract Response newResponse();
protected abstract ClusterBlockException checkGlobalBlock(ClusterState state, Request request);
protected abstract ClusterBlockException checkRequestBlock(ClusterState state, Request request);
/**
* Resolves the request, by default, simply setting the concrete index (if its aliased one). If the resolve
* means a different execution, then return false here to indicate not to continue and execute this request.
*/
protected boolean resolveRequest(ClusterState state, Request request, ActionListener listener) {
request.index(state.metaData().concreteIndex(request.index()));
return true;
}
protected boolean retryOnFailure(Throwable e) {
return false;
}
protected TransportRequestOptions transportOptions() {
return TransportRequestOptions.EMPTY;
}
/**
* Should return an iterator with a single shard!
*/
protected abstract ShardIterator shards(ClusterState clusterState, Request request) throws ElasticSearchException;
class AsyncSingleAction {
private final ActionListener listener;
private final Request request;
private ShardIterator shardIt;
private DiscoveryNodes nodes;
private final AtomicBoolean operationStarted = new AtomicBoolean();
private AsyncSingleAction(Request request, ActionListener listener) {
this.request = request;
this.listener = listener;
}
public void start() {
start(false);
}
public boolean start(final boolean fromClusterEvent) throws ElasticSearchException {
final ClusterState clusterState = clusterService.state();
nodes = clusterState.nodes();
try {
ClusterBlockException blockException = checkGlobalBlock(clusterState, request);
if (blockException != null) {
if (blockException.retryable()) {
retry(fromClusterEvent, blockException);
return false;
} else {
throw blockException;
}
}
// check if we need to execute, and if not, return
if (!resolveRequest(clusterState, request, listener)) {
return true;
}
blockException = checkRequestBlock(clusterState, request);
if (blockException != null) {
if (blockException.retryable()) {
retry(fromClusterEvent, blockException);
return false;
} else {
throw blockException;
}
}
shardIt = shards(clusterState, request);
} catch (Throwable e) {
listener.onFailure(e);
return true;
}
// no shardIt, might be in the case between index gateway recovery and shardIt initialization
if (shardIt.size() == 0) {
retry(fromClusterEvent, null);
return false;
}
// this transport only make sense with an iterator that returns a single shard routing (like primary)
assert shardIt.size() == 1;
ShardRouting shard = shardIt.nextOrNull();
assert shard != null;
if (!shard.active()) {
retry(fromClusterEvent, null);
return false;
}
if (!operationStarted.compareAndSet(false, true)) {
return true;
}
request.shardId = shardIt.shardId().id();
if (shard.currentNodeId().equals(nodes.localNodeId())) {
request.beforeLocalFork();
threadPool.executor(executor).execute(new Runnable() {
@Override
public void run() {
try {
shardOperation(request, listener);
} catch (Exception e) {
if (retryOnFailure(e)) {
retry(fromClusterEvent, null);
} else {
listener.onFailure(e);
}
}
}
});
} else {
DiscoveryNode node = nodes.get(shard.currentNodeId());
transportService.sendRequest(node, transportAction, request, transportOptions(), new BaseTransportResponseHandler() {
@Override
public Response newInstance() {
return newResponse();
}
@Override
public String executor() {
return ThreadPool.Names.SAME;
}
@Override
public void handleResponse(Response response) {
listener.onResponse(response);
}
@Override
public void handleException(TransportException exp) {
// if we got disconnected from the node, or the node / shard is not in the right state (being closed)
if (exp.unwrapCause() instanceof ConnectTransportException || exp.unwrapCause() instanceof NodeClosedException ||
retryOnFailure(exp)) {
operationStarted.set(false);
// we already marked it as started when we executed it (removed the listener) so pass false
// to re-add to the cluster listener
retry(false, null);
} else {
listener.onFailure(exp);
}
}
});
}
return true;
}
void retry(final boolean fromClusterEvent, final @Nullable Throwable failure) {
if (!fromClusterEvent) {
// make it threaded operation so we fork on the discovery listener thread
request.beforeLocalFork();
clusterService.add(request.timeout(), new TimeoutClusterStateListener() {
@Override
public void postAdded() {
if (start(true)) {
// if we managed to start and perform the operation on the primary, we can remove this listener
clusterService.remove(this);
}
}
@Override
public void onClose() {
clusterService.remove(this);
listener.onFailure(new NodeClosedException(nodes.localNode()));
}
@Override
public void clusterChanged(ClusterChangedEvent event) {
if (start(true)) {
// if we managed to start and perform the operation on the primary, we can remove this listener
clusterService.remove(this);
}
}
@Override
public void onTimeout(TimeValue timeValue) {
// just to be on the safe side, see if we can start it now?
if (start(true)) {
clusterService.remove(this);
return;
}
clusterService.remove(this);
Throwable listenFailure = failure;
if (listenFailure == null) {
if (shardIt == null) {
listenFailure = new UnavailableShardsException(new ShardId(request.index(), -1), "Timeout waiting for [" + timeValue + "], request: " + request.toString());
} else {
listenFailure = new UnavailableShardsException(shardIt.shardId(), "[" + shardIt.size() + "] shardIt, [" + shardIt.sizeActive() + "] active : Timeout waiting for [" + timeValue + "], request: " + request.toString());
}
}
listener.onFailure(listenFailure);
}
});
}
}
}
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);
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);
}
}
});
}
}
}
