hadoop EchoUserResolver 源码
haddop EchoUserResolver 代码
文件路径：/hadoop-tools/hadoop-gridmix/src/main/java/org/apache/hadoop/mapred/gridmix/EchoUserResolver.java
/**
* 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.hadoop.mapred.gridmix;
import java.io.IOException;
import java.net.URI;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.security.UserGroupInformation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Echos the UGI offered.
*/
public class EchoUserResolver implements UserResolver {
public static final Logger LOG = LoggerFactory.getLogger(Gridmix.class);
public EchoUserResolver() {
LOG.info(" Current user resolver is EchoUserResolver ");
}
public synchronized boolean setTargetUsers(URI userdesc, Configuration conf)
throws IOException {
return false;
}
public synchronized UserGroupInformation getTargetUgi(
UserGroupInformation ugi) {
return ugi;
}
/**
* {@inheritDoc}
* <br><br>
* Since {@link EchoUserResolver} simply returns the user's name passed as
* the argument, it doesn't need a target list of users.
*/
public boolean needsTargetUsersList() {
return false;
}
}
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