| /** |
| * 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.streaming; |
| |
| import java.io.*; |
| |
| import org.apache.hadoop.io.Text; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableComparable; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.FSDataInputStream; |
| import org.apache.hadoop.mapred.Reporter; |
| import org.apache.hadoop.mapred.RecordReader; |
| import org.apache.hadoop.mapred.FileSplit; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.commons.logging.*; |
| |
| /** |
| * Shared functionality for hadoopStreaming formats. |
| * A custom reader can be defined to be a RecordReader with the constructor below |
| * and is selected with the option bin/hadoopStreaming -inputreader ... |
| * @see StreamXmlRecordReader |
| */ |
| public abstract class StreamBaseRecordReader implements RecordReader<Text, Text> { |
| |
| protected static final Log LOG = LogFactory.getLog(StreamBaseRecordReader.class.getName()); |
| |
| // custom JobConf properties for this class are prefixed with this namespace |
| final static String CONF_NS = "stream.recordreader."; |
| |
| public StreamBaseRecordReader(FSDataInputStream in, FileSplit split, Reporter reporter, |
| JobConf job, FileSystem fs) throws IOException { |
| in_ = in; |
| split_ = split; |
| start_ = split_.getStart(); |
| length_ = split_.getLength(); |
| end_ = start_ + length_; |
| splitName_ = split_.getPath().getName(); |
| reporter_ = reporter; |
| job_ = job; |
| fs_ = fs; |
| |
| statusMaxRecordChars_ = job_.getInt(CONF_NS + "statuschars", 200); |
| } |
| |
| /// RecordReader API |
| |
| /** Read a record. Implementation should call numRecStats at the end |
| */ |
| public abstract boolean next(Text key, Text value) throws IOException; |
| |
| /** Returns the current position in the input. */ |
| public synchronized long getPos() throws IOException { |
| return in_.getPos(); |
| } |
| |
| /** Close this to future operations.*/ |
| public synchronized void close() throws IOException { |
| in_.close(); |
| } |
| |
| public float getProgress() throws IOException { |
| if (end_ == start_) { |
| return 1.0f; |
| } else { |
| return ((float)(in_.getPos() - start_)) / ((float)(end_ - start_)); |
| } |
| } |
| |
| public Text createKey() { |
| return new Text(); |
| } |
| |
| public Text createValue() { |
| return new Text(); |
| } |
| |
| /// StreamBaseRecordReader API |
| |
| /** Implementation should seek forward in_ to the first byte of the next record. |
| * The initial byte offset in the stream is arbitrary. |
| */ |
| public abstract void seekNextRecordBoundary() throws IOException; |
| |
| void numRecStats(byte[] record, int start, int len) throws IOException { |
| numRec_++; |
| if (numRec_ == nextStatusRec_) { |
| String recordStr = new String(record, start, Math.min(len, statusMaxRecordChars_), "UTF-8"); |
| nextStatusRec_ += 100;//*= 10; |
| String status = getStatus(recordStr); |
| LOG.info(status); |
| reporter_.setStatus(status); |
| } |
| } |
| |
| long lastMem = 0; |
| |
| String getStatus(CharSequence record) { |
| long pos = -1; |
| try { |
| pos = getPos(); |
| } catch (IOException io) { |
| } |
| String recStr; |
| if (record.length() > statusMaxRecordChars_) { |
| recStr = record.subSequence(0, statusMaxRecordChars_) + "..."; |
| } else { |
| recStr = record.toString(); |
| } |
| String unqualSplit = split_.getPath().getName() + ":" + |
| split_.getStart() + "+" + split_.getLength(); |
| String status = "HSTR " + StreamUtil.HOST + " " + numRec_ + ". pos=" + pos + " " + unqualSplit |
| + " Processing record=" + recStr; |
| status += " " + splitName_; |
| return status; |
| } |
| |
| FSDataInputStream in_; |
| FileSplit split_; |
| long start_; |
| long end_; |
| long length_; |
| String splitName_; |
| Reporter reporter_; |
| JobConf job_; |
| FileSystem fs_; |
| int numRec_ = 0; |
| int nextStatusRec_ = 1; |
| int statusMaxRecordChars_; |
| |
| } |