datafu.hourglass.avro

Class AvroMultipleInputsKeyInputFormat<T>

java.lang.Object

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

org.apache.hadoop.mapreduce.lib.input.FileInputFormat<org.apache.avro.mapred.AvroKey<T>,org.apache.hadoop.io.NullWritable>

datafu.hourglass.avro.AvroMultipleInputsKeyInputFormat<T>

public class AvroMultipleInputsKeyInputFormat<T>
extends org.apache.hadoop.mapreduce.lib.input.FileInputFormat<org.apache.avro.mapred.AvroKey<T>,org.apache.hadoop.io.NullWritable>

A MapReduce InputFormat that can handle Avro container files and multiple inputs. The input schema is determine based on the split. The mapping from input path to schema is stored in the job configuration.

Keys are AvroKey wrapper objects that contain the Avro data. Since Avro container files store only records (not key/value pairs), the value from this InputFormat is a NullWritable.

Nested Class Summary

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
AvroMultipleInputsKeyInputFormat()

Method Summary

Methods

Modifier and Type	Method and Description
org.apache.hadoop.mapreduce.RecordReader<org.apache.avro.mapred.AvroKey<T>,org.apache.hadoop.io.NullWritable>	createRecordReader(org.apache.hadoop.mapreduce.InputSplit split, org.apache.hadoop.mapreduce.TaskAttemptContext context)

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

addInputPath, addInputPathRecursively, addInputPaths, computeSplitSize, getBlockIndex, getFormatMinSplitSize, getInputDirRecursive, getInputPathFilter, getInputPaths, getMaxSplitSize, getMinSplitSize, getSplits, isSplitable, 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

AvroMultipleInputsKeyInputFormat

public AvroMultipleInputsKeyInputFormat()

Method Detail

createRecordReader

public org.apache.hadoop.mapreduce.RecordReader<org.apache.avro.mapred.AvroKey<T>,org.apache.hadoop.io.NullWritable> createRecordReader(org.apache.hadoop.mapreduce.InputSplit split,
                                                                                                                               org.apache.hadoop.mapreduce.TaskAttemptContext context)
                                                                                                                                 throws java.io.IOException,
                                                                                                                                        java.lang.InterruptedException

Specified by:

createRecordReader in class org.apache.hadoop.mapreduce.InputFormat<org.apache.avro.mapred.AvroKey<T>,org.apache.hadoop.io.NullWritable>

Throws:

java.io.IOException

java.lang.InterruptedException