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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.apache.spark.network.shuffle;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.List;
import com.google.common.collect.Lists;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.spark.network.TransportContext;
import org.apache.spark.network.client.TransportClient;
import org.apache.spark.network.client.TransportClientBootstrap;
import org.apache.spark.network.client.TransportClientFactory;
import org.apache.spark.network.crypto.AuthClientBootstrap;
import org.apache.spark.network.sasl.SecretKeyHolder;
import org.apache.spark.network.server.NoOpRpcHandler;
import org.apache.spark.network.shuffle.protocol.ExecutorShuffleInfo;
import org.apache.spark.network.shuffle.protocol.RegisterExecutor;
import org.apache.spark.network.util.TransportConf;
/**
* Client for reading shuffle blocks which points to an external (outside of executor) server.
* This is instead of reading shuffle blocks directly from other executors (via
* BlockTransferService), which has the downside of losing the shuffle data if we lose the
* executors.
*/
public class ExternalShuffleClient extends ShuffleClient {
private static final Logger logger = LoggerFactory.getLogger(ExternalShuffleClient.class);
private final TransportConf conf;
private final boolean authEnabled;
private final SecretKeyHolder secretKeyHolder;
protected TransportClientFactory clientFactory;
protected String appId;
/**
* Creates an external shuffle client, with SASL optionally enabled. If SASL is not enabled,
* then secretKeyHolder may be null.
*/
public ExternalShuffleClient(
TransportConf conf,
SecretKeyHolder secretKeyHolder,
boolean authEnabled) {
this.conf = conf;
this.secretKeyHolder = secretKeyHolder;
this.authEnabled = authEnabled;
}
protected void checkInit() {
assert appId != null : "Called before init()";
}
@Override
public void init(String appId) {
this.appId = appId;
TransportContext context = new TransportContext(conf, new NoOpRpcHandler(), true);
List<TransportClientBootstrap> bootstraps = Lists.newArrayList();
if (authEnabled) {
bootstraps.add(new AuthClientBootstrap(conf, appId, secretKeyHolder));
}
clientFactory = context.createClientFactory(bootstraps);
}
@Override
public void fetchBlocks(
final String host,
final int port,
final String execId,
String[] blockIds,
BlockFetchingListener listener) {
checkInit();
logger.debug("External shuffle fetch from {}:{} (executor id {})", host, port, execId);
try {
RetryingBlockFetcher.BlockFetchStarter blockFetchStarter =
new RetryingBlockFetcher.BlockFetchStarter() {
@Override
public void createAndStart(String[] blockIds, BlockFetchingListener listener)
throws IOException, InterruptedException {
TransportClient client = clientFactory.createClient(host, port);
new OneForOneBlockFetcher(client, appId, execId, blockIds, listener).start();
}
};
int maxRetries = conf.maxIORetries();
if (maxRetries > 0) {
// Note this Fetcher will correctly handle maxRetries == 0; we avoid it just in case there's
// a bug in this code. We should remove the if statement once we're sure of the stability.
new RetryingBlockFetcher(conf, blockFetchStarter, blockIds, listener).start();
} else {
blockFetchStarter.createAndStart(blockIds, listener);
}
} catch (Exception e) {
logger.error("Exception while beginning fetchBlocks", e);
for (String blockId : blockIds) {
listener.onBlockFetchFailure(blockId, e);
}
}
}
/**
* Registers this executor with an external shuffle server. This registration is required to
* inform the shuffle server about where and how we store our shuffle files.
*
* @param host Host of shuffle server.
* @param port Port of shuffle server.
* @param execId This Executor's id.
* @param executorInfo Contains all info necessary for the service to find our shuffle files.
*/
public void registerWithShuffleServer(
String host,
int port,
String execId,
ExecutorShuffleInfo executorInfo) throws IOException, InterruptedException {
checkInit();
TransportClient client = clientFactory.createUnmanagedClient(host, port);
try {
ByteBuffer registerMessage = new RegisterExecutor(appId, execId, executorInfo).toByteBuffer();
client.sendRpcSync(registerMessage, 5000 /* timeoutMs */);
} finally {
client.close();
}
}
@Override
public void close() {
clientFactory.close();
}
}
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