| /** |
| * 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.hcat; |
| |
| import java.io.IOException; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.io.WritableComparable; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hadoop.mapreduce.RecordReader; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| import org.apache.hive.hcatalog.data.HCatRecord; |
| |
| /** |
| * A Record Reader that can combine underlying splits. |
| */ |
| public class SqoopHCatRecordReader extends |
| RecordReader<WritableComparable, HCatRecord> { |
| private final SqoopHCatExportFormat hCatExportFormat; |
| private SqoopHCatInputSplit hCatSplit; |
| private TaskAttemptContext context; |
| private int subIndex; |
| private long progress; |
| |
| private RecordReader<WritableComparable, HCatRecord> curReader; |
| |
| public static final Log LOG = LogFactory |
| .getLog(SqoopHCatRecordReader.class.getName()); |
| |
| public SqoopHCatRecordReader(final InputSplit split, |
| final TaskAttemptContext context, final SqoopHCatExportFormat inputFormat) |
| throws IOException { |
| this.hCatSplit = (SqoopHCatInputSplit) split; |
| this.context = context; |
| this.subIndex = 0; |
| this.curReader = null; |
| this.progress = 0L; |
| this.hCatExportFormat = inputFormat; |
| |
| initNextRecordReader(); |
| } |
| |
| @Override |
| public void initialize(final InputSplit split, |
| final TaskAttemptContext ctxt) |
| throws IOException, InterruptedException { |
| this.hCatSplit = (SqoopHCatInputSplit) split; |
| this.context = ctxt; |
| |
| if (null != this.curReader) { |
| this.curReader.initialize(((SqoopHCatInputSplit) split) |
| .get(0), context); |
| } |
| } |
| |
| @Override |
| public boolean nextKeyValue() throws IOException, InterruptedException { |
| while (this.curReader == null || !this.curReader.nextKeyValue()) { |
| if (!initNextRecordReader()) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| @Override |
| public WritableComparable getCurrentKey() throws IOException, |
| InterruptedException { |
| return this.curReader.getCurrentKey(); |
| } |
| |
| @Override |
| public HCatRecord getCurrentValue() throws IOException, InterruptedException { |
| return this.curReader.getCurrentValue(); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| if (this.curReader != null) { |
| this.curReader.close(); |
| this.curReader = null; |
| } |
| } |
| |
| @Override |
| public float getProgress() throws IOException, InterruptedException { |
| long subprogress = 0L; |
| if (null != this.curReader) { |
| subprogress = (long) (this.curReader.getProgress() |
| * this.hCatSplit.get(this.subIndex - 1).getLength()); |
| } |
| // Indicate the total processed count. |
| return Math.min(1.0F, (this.progress + subprogress) |
| / (float) this.hCatSplit.getLength()); |
| } |
| |
| protected boolean initNextRecordReader() throws IOException { |
| if (this.curReader != null) { |
| // close current record reader if open |
| this.curReader.close(); |
| this.curReader = null; |
| if (this.subIndex > 0) { |
| this.progress += |
| this.hCatSplit.get(this.subIndex - 1).getLength(); |
| } |
| LOG.debug("Closed current reader. Current progress = " + progress); |
| } |
| |
| if (this.subIndex == this.hCatSplit.length()) { |
| LOG.debug("Done with all splits"); |
| return false; |
| } |
| |
| try { |
| // get a record reader for the subsplit-index chunk |
| |
| this.curReader = this.hCatExportFormat.createHCatRecordReader( |
| this.hCatSplit.get(this.subIndex), this.context); |
| |
| LOG.debug("Created a HCatRecordReader for split " + subIndex); |
| // initialize() for the first RecordReader will be called by MapTask; |
| // we're responsible for initializing subsequent RecordReaders. |
| if (this.subIndex > 0) { |
| this.curReader.initialize(this.hCatSplit.get(this.subIndex), |
| this.context); |
| LOG.info("Initialized reader with current split"); |
| } |
| } catch (Exception e) { |
| throw new IOException("Error initializing HCat record reader", e); |
| } |
| LOG.debug("Created record reader for subsplit " + subIndex); |
| ++this.subIndex; |
| return true; |
| } |
| } |
| |