| /** |
| * 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.sqoop.mapreduce; |
| |
| import java.io.IOException; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.io.LongWritable; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hadoop.mapreduce.RecordReader; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| import org.apache.hadoop.mapreduce.lib.input.FileSplit; |
| import org.apache.hadoop.mapreduce.lib.input.LineRecordReader; |
| import org.apache.hadoop.mapreduce.lib.input.SequenceFileRecordReader; |
| import org.apache.hadoop.util.ReflectionUtils; |
| |
| /** |
| * RecordReader that CombineFileRecordReader can instantiate, which itself |
| * translates a CombineFileSplit into a FileSplit. |
| */ |
| public class CombineShimRecordReader |
| extends RecordReader<LongWritable, Object> { |
| |
| public static final Log LOG = |
| LogFactory.getLog(CombineShimRecordReader.class.getName()); |
| |
| private CombineFileSplit split; |
| private TaskAttemptContext context; |
| private int index; |
| private RecordReader<LongWritable, Object> rr; |
| |
| /** |
| * Constructor invoked by CombineFileRecordReader that identifies part of a |
| * CombineFileSplit to use. |
| */ |
| public CombineShimRecordReader(CombineFileSplit split, |
| TaskAttemptContext context, Integer index) |
| throws IOException, InterruptedException { |
| this.index = index; |
| this.split = (CombineFileSplit) split; |
| this.context = context; |
| |
| createChildReader(); |
| } |
| |
| @Override |
| public void initialize(InputSplit curSplit, TaskAttemptContext curContext) |
| throws IOException, InterruptedException { |
| this.split = (CombineFileSplit) curSplit; |
| this.context = curContext; |
| |
| if (null == rr) { |
| createChildReader(); |
| } |
| |
| FileSplit fileSplit = new FileSplit(this.split.getPath(index), |
| this.split.getOffset(index), this.split.getLength(index), |
| this.split.getLocations()); |
| this.rr.initialize(fileSplit, this.context); |
| } |
| |
| @Override |
| public float getProgress() throws IOException, InterruptedException { |
| return rr.getProgress(); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| if (null != rr) { |
| rr.close(); |
| rr = null; |
| } |
| } |
| |
| @Override |
| public LongWritable getCurrentKey() |
| throws IOException, InterruptedException { |
| return rr.getCurrentKey(); |
| } |
| |
| @Override |
| public Object getCurrentValue() |
| throws IOException, InterruptedException { |
| return rr.getCurrentValue(); |
| } |
| |
| @Override |
| public boolean nextKeyValue() throws IOException, InterruptedException { |
| return rr.nextKeyValue(); |
| } |
| |
| /** |
| * Actually instantiate the user's chosen RecordReader implementation. |
| */ |
| @SuppressWarnings("unchecked") |
| private void createChildReader() throws IOException, InterruptedException { |
| LOG.debug("ChildSplit operates on: " + split.getPath(index)); |
| |
| Configuration conf = context.getConfiguration(); |
| |
| // Determine the file format we're reading. |
| Class rrClass; |
| if (ExportJobBase.isSequenceFiles(conf, split.getPath(index))) { |
| rrClass = SequenceFileRecordReader.class; |
| } else { |
| rrClass = LineRecordReader.class; |
| } |
| |
| // Create the appropriate record reader. |
| this.rr = (RecordReader<LongWritable, Object>) |
| ReflectionUtils.newInstance(rrClass, conf); |
| } |
| } |