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

Constructor Summary

AvroMultipleInputsKeyInputFormat()

Method Summary

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, addInputPaths, computeSplitSize, getBlockIndex, getFormatMinSplitSize, getInputPathFilter, getInputPaths, getMaxSplitSize, getMinSplitSize, getSplits, isSplitable, listStatus, 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