| /** |
| * 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 kafka.etl; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| import org.apache.hadoop.io.BytesWritable; |
| import org.apache.hadoop.mapred.FileSplit; |
| import org.apache.hadoop.mapred.InputSplit; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.hadoop.mapred.Reporter; |
| import org.apache.hadoop.mapred.SequenceFileRecordReader; |
| import org.apache.hadoop.mapred.lib.MultipleOutputs; |
| |
| @SuppressWarnings({ "deprecation" }) |
| public class KafkaETLRecordReader |
| extends SequenceFileRecordReader<KafkaETLKey, BytesWritable> { |
| |
| /* max number of retries */ |
| protected Props _props; /*properties*/ |
| protected JobConf _job; |
| protected Reporter _reporter ; |
| protected MultipleOutputs _mos; |
| protected List<KafkaETLContext> _contextList; |
| protected int _contextIndex ; |
| |
| protected long _totalBytes; |
| protected long _readBytes; |
| protected long _readCounts; |
| |
| protected String _attemptId = null; |
| |
| private static long _limit = 100; /*for testing only*/ |
| |
| public KafkaETLRecordReader(InputSplit split, JobConf job, Reporter reporter) |
| throws IOException { |
| super(job, (FileSplit) split); |
| |
| _props = KafkaETLUtils.getPropsFromJob(job); |
| _contextList = new ArrayList<KafkaETLContext>(); |
| _job = job; |
| _reporter = reporter; |
| _contextIndex = -1; |
| _mos = new MultipleOutputs(job); |
| try { |
| _limit = _props.getInt("kafka.request.limit", -1); |
| |
| /*get attemp id*/ |
| String taskId = _job.get("mapred.task.id"); |
| if (taskId == null) { |
| throw new IllegalArgumentException( |
| "Configutaion does not contain the property mapred.task.id"); |
| } |
| String[] parts = taskId.split("_"); |
| if ( parts.length != 6 || !parts[0].equals("attempt") |
| || (!"m".equals(parts[3]) && !"r".equals(parts[3]))) { |
| throw new IllegalArgumentException( |
| "TaskAttemptId string : " + taskId + " is not properly formed"); |
| } |
| _attemptId = parts[4]+parts[3]; |
| }catch (Exception e) { |
| throw new IOException (e); |
| } |
| } |
| |
| @Override |
| public synchronized void close() throws IOException { |
| super.close(); |
| |
| /* now record some stats */ |
| for (KafkaETLContext context: _contextList) { |
| context.output(_attemptId); |
| context.close(); |
| } |
| |
| _mos.close(); |
| } |
| |
| @Override |
| public KafkaETLKey createKey() { |
| return super.createKey(); |
| } |
| |
| @Override |
| public BytesWritable createValue() { |
| return super.createValue(); |
| } |
| |
| @Override |
| public float getProgress() throws IOException { |
| if (_totalBytes == 0) return 0f; |
| |
| if (_contextIndex >= _contextList.size()) return 1f; |
| |
| if (_limit < 0) { |
| double p = ( _readBytes + getContext().getReadBytes() ) / ((double) _totalBytes); |
| return (float)p; |
| } |
| else { |
| double p = (_readCounts + getContext().getCount()) / ((double)_limit * _contextList.size()); |
| return (float)p; |
| } |
| } |
| |
| @Override |
| public synchronized boolean next(KafkaETLKey key, BytesWritable value) |
| throws IOException { |
| try{ |
| if (_contextIndex < 0) { /* first call, get all requests */ |
| System.out.println("RecordReader.next init()"); |
| _totalBytes = 0; |
| |
| while ( super.next(key, value)) { |
| String input = new String(value.getBytes(), "UTF-8"); |
| int index = _contextList.size(); |
| KafkaETLContext context = new KafkaETLContext( |
| _job, _props, _reporter, _mos, index, input); |
| _contextList.add(context); |
| _totalBytes += context.getTotalBytes(); |
| } |
| System.out.println("Number of requests=" + _contextList.size()); |
| |
| _readBytes = 0; |
| _readCounts = 0; |
| _contextIndex = 0; |
| } |
| |
| while (_contextIndex < _contextList.size()) { |
| |
| KafkaETLContext currContext = getContext(); |
| |
| while (currContext.hasMore() && |
| (_limit < 0 || currContext.getCount() < _limit)) { |
| |
| if (currContext.getNext(key, value)) { |
| //System.out.println("RecordReader.next get (key,value)"); |
| return true; |
| } |
| else { |
| //System.out.println("RecordReader.next fetch more"); |
| currContext.fetchMore(); |
| } |
| } |
| |
| _readBytes += currContext.getReadBytes(); |
| _readCounts += currContext.getCount(); |
| _contextIndex ++; |
| System.out.println("RecordReader.next will get from request " + _contextIndex); |
| } |
| }catch (Exception e) { |
| throw new IOException (e); |
| } |
| return false; |
| } |
| |
| protected KafkaETLContext getContext() throws IOException{ |
| if (_contextIndex >= _contextList.size()) |
| throw new IOException ("context index " + _contextIndex + " is out of bound " |
| + _contextList.size()); |
| return _contextList.get(_contextIndex); |
| } |
| |
| |
| |
| } |