1 /** 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 package org.apache.hadoop.hbase; 20 21 import java.io.IOException; 22 23 import org.apache.hadoop.hdfs.DFSClient; 24 import org.apache.hadoop.hdfs.DistributedFileSystem; 25 import org.apache.hadoop.hdfs.protocol.FSConstants.DatanodeReportType; 26 import org.apache.hadoop.mapreduce.Job; 27 import org.apache.hadoop.mapreduce.TaskAttemptContext; 28 import org.apache.hadoop.mapreduce.TaskAttemptID; 29 30 /** 31 * Compatibility shim layer implementation for Hadoop-1. 32 */ 33 public class HadoopShimsImpl implements HadoopShims { 34 35 /** 36 * Returns a TaskAttemptContext instance created from the given parameters. 37 * @param job an instance of o.a.h.mapreduce.Job 38 * @param taskId an identifier for the task attempt id. Should be parsable by 39 * TaskAttemptId.forName() 40 * @return a concrete TaskAttemptContext instance of o.a.h.mapreduce.TaskAttemptContext 41 */ 42 @Override 43 @SuppressWarnings("unchecked") 44 public <T, J> T createTestTaskAttemptContext(J job, String taskId) { 45 Job j = (Job)job; 46 return (T)new TaskAttemptContext(j.getConfiguration(), TaskAttemptID.forName(taskId)); 47 } 48 49 /** 50 * Returns an array of DatanodeInfo for all live datanodes in the cluster 51 * @param dfs instance of DistributedFileSystem 52 * @return 53 * @throws IOException 54 */ 55 @Override 56 @SuppressWarnings("unchecked") 57 public <I, DFS> I[] getLiveDatanodes(DFS dfs) throws IOException { 58 DFSClient dfsClient = ((DistributedFileSystem)dfs).getClient(); 59 return (I[])dfsClient.datanodeReport(DatanodeReportType.LIVE); 60 } 61 62 }