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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.sasl;
import java.nio.ByteBuffer;
import java.util.concurrent.ConcurrentHashMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.spark.network.util.JavaUtils;
/**
* A class that manages shuffle secret used by the external shuffle service.
*/
public class ShuffleSecretManager implements SecretKeyHolder {
private final Logger logger = LoggerFactory.getLogger(ShuffleSecretManager.class);
private final ConcurrentHashMap<String, String> shuffleSecretMap;
// Spark user used for authenticating SASL connections
// Note that this must match the value in org.apache.spark.SecurityManager
private static final String SPARK_SASL_USER = "sparkSaslUser";
public ShuffleSecretManager() {
shuffleSecretMap = new ConcurrentHashMap<String, String>();
}
/**
* Register an application with its secret.
* Executors need to first authenticate themselves with the same secret before
* fetching shuffle files written by other executors in this application.
*/
public void registerApp(String appId, String shuffleSecret) {
if (!shuffleSecretMap.contains(appId)) {
shuffleSecretMap.put(appId, shuffleSecret);
logger.info("Registered shuffle secret for application {}", appId);
} else {
logger.debug("Application {} already registered", appId);
}
}
/**
* Register an application with its secret specified as a byte buffer.
*/
public void registerApp(String appId, ByteBuffer shuffleSecret) {
registerApp(appId, JavaUtils.bytesToString(shuffleSecret));
}
/**
* Unregister an application along with its secret.
* This is called when the application terminates.
*/
public void unregisterApp(String appId) {
if (shuffleSecretMap.contains(appId)) {
shuffleSecretMap.remove(appId);
logger.info("Unregistered shuffle secret for application {}", appId);
} else {
logger.warn("Attempted to unregister application {} when it is not registered", appId);
}
}
/**
* Return the Spark user for authenticating SASL connections.
*/
@Override
public String getSaslUser(String appId) {
return SPARK_SASL_USER;
}
/**
* Return the secret key registered with the given application.
* This key is used to authenticate the executors before they can fetch shuffle files
* written by this application from the external shuffle service. If the specified
* application is not registered, return null.
*/
@Override
public String getSecretKey(String appId) {
return shuffleSecretMap.get(appId);
}
}
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