hadoop UserResolver 源码
haddop UserResolver 代码
文件路径：/hadoop-tools/hadoop-gridmix/src/main/java/org/apache/hadoop/mapred/gridmix/UserResolver.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.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/**
* Maps users in the trace to a set of valid target users on the test cluster.
*/
@InterfaceAudience.Private
@InterfaceStability.Evolving
public interface UserResolver {
/**
* Configure the user map given the URI and configuration. The resolver's
* contract will define how the resource will be interpreted, but the default
* will typically interpret the URI as a {@link org.apache.hadoop.fs.Path}
* listing target users.
* This method should be called only if {@link #needsTargetUsersList()}
* returns true.
* @param userdesc URI from which user information may be loaded per the
* subclass contract.
* @param conf The tool configuration.
* @return true if the resource provided was used in building the list of
* target users
*/
public boolean setTargetUsers(URI userdesc, Configuration conf)
throws IOException;
/**
* Map the given UGI to another per the subclass contract.
* @param ugi User information from the trace.
*/
public UserGroupInformation getTargetUgi(UserGroupInformation ugi);
/**
* Indicates whether this user resolver needs a list of target users to be
* provided.
*
* @return true if a list of target users is to be provided for this
* user resolver
*/
public boolean needsTargetUsersList();
}
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