org.apache.hadoop.hbase.test.util.warc

Class WARCInputFormat

java.lang.Object

org.apache.hadoop.mapreduce.InputFormat<K,V>

org.apache.hadoop.mapreduce.lib.input.FileInputFormat<org.apache.hadoop.io.LongWritable,WARCWritable>

org.apache.hadoop.hbase.test.util.warc.WARCInputFormat

public class WARCInputFormat
extends org.apache.hadoop.mapreduce.lib.input.FileInputFormat<org.apache.hadoop.io.LongWritable,WARCWritable>

Hadoop InputFormat for mapreduce jobs ('new' API) that want to process data in WARC files. Usage: ```java Job job = new Job(getConf()); job.setInputFormatClass(WARCInputFormat.class); ``` Mappers should use a key of LongWritable (which is 1 for the first record in a file, 2 for the second record, etc.) and a value of WARCWritable.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	WARCInputFormat.WARCReader

Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.lib.input.FileInputFormat

org.apache.hadoop.mapreduce.lib.input.FileInputFormat.Counter

Field Summary

Fields inherited from class org.apache.hadoop.mapreduce.lib.input.FileInputFormat

DEFAULT_LIST_STATUS_NUM_THREADS, INPUT_DIR, INPUT_DIR_RECURSIVE, LIST_STATUS_NUM_THREADS, NUM_INPUT_FILES, PATHFILTER_CLASS, SPLIT_MAXSIZE, SPLIT_MINSIZE

Constructor Summary

Constructors

Constructor and Description
WARCInputFormat()

Method Summary

Modifier and Type	Method and Description
org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.LongWritable,WARCWritable>	createRecordReader(org.apache.hadoop.mapreduce.InputSplit split, org.apache.hadoop.mapreduce.TaskAttemptContext context) Opens a WARC file (possibly compressed) for reading, and returns a RecordReader for accessing it.
protected boolean	isSplitable(org.apache.hadoop.mapreduce.JobContext context, org.apache.hadoop.fs.Path filename) Always returns false, as WARC files cannot be split.

Methods inherited from class org.apache.hadoop.mapreduce.lib.input.FileInputFormat

addInputPath, addInputPathRecursively, addInputPaths, computeSplitSize, getBlockIndex, getFormatMinSplitSize, getInputDirRecursive, getInputPathFilter, getInputPaths, getMaxSplitSize, getMinSplitSize, getSplits, listStatus, makeSplit, makeSplit, setInputDirRecursive, setInputPathFilter, setInputPaths, setInputPaths, setMaxInputSplitSize, setMinInputSplitSize

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

WARCInputFormat

public WARCInputFormat()

Method Detail

createRecordReader

public org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.LongWritable,WARCWritable> createRecordReader(org.apache.hadoop.mapreduce.InputSplit split,
                                                                                                                   org.apache.hadoop.mapreduce.TaskAttemptContext context)
                                                                                                            throws IOException,
                                                                                                                   InterruptedException

Opens a WARC file (possibly compressed) for reading, and returns a RecordReader for accessing it.

Specified by:

createRecordReader in class org.apache.hadoop.mapreduce.InputFormat<org.apache.hadoop.io.LongWritable,WARCWritable>

Throws:

IOException

InterruptedException

isSplitable

protected boolean isSplitable(org.apache.hadoop.mapreduce.JobContext context,
                              org.apache.hadoop.fs.Path filename)

Always returns false, as WARC files cannot be split.

Overrides:

isSplitable in class org.apache.hadoop.mapreduce.lib.input.FileInputFormat<org.apache.hadoop.io.LongWritable,WARCWritable>