org.apache.hadoop.hive.ql.exec.tez.tools
Class InputMerger

java.lang.Object
  org.apache.hadoop.hive.ql.exec.tez.tools.InputMerger

All Implemented Interfaces:

org.apache.tez.runtime.api.Reader, org.apache.tez.runtime.library.api.KeyValuesReader

public class InputMerger
extends Object
implements org.apache.tez.runtime.library.api.KeyValuesReader

A KeyValuesReader implementation that returns a sorted stream of key-values by doing a sorted merge of the key-value in LogicalInputs. Tags are in the last byte of the key, so no special handling for tags is required. Uses a priority queue to pick the KeyValuesReader of the input that is next in sort order.

Field Summary

static org.apache.commons.logging.Log

l4j

Constructor Summary

InputMerger(List<? extends org.apache.tez.runtime.api.Input> shuffleInputs)

Method Summary

Object	getCurrentKey()
Iterable<Object>	getCurrentValues()
boolean	next()

Methods inherited from class java.lang.Object

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

Field Detail

l4j

public static final org.apache.commons.logging.Log l4j

Constructor Detail

InputMerger

public InputMerger(List<? extends org.apache.tez.runtime.api.Input> shuffleInputs)
            throws Exception

Throws:

Exception

Method Detail

next

public boolean next()
             throws IOException

Specified by:

next in interface org.apache.tez.runtime.library.api.KeyValuesReader

Returns:

true if there are more key-values and advances to next key-values

Throws:

IOException

getCurrentKey

public Object getCurrentKey()
                     throws IOException

Specified by:

getCurrentKey in interface org.apache.tez.runtime.library.api.KeyValuesReader

Throws:

IOException

getCurrentValues

public Iterable<Object> getCurrentValues()
                                  throws IOException

Specified by:

getCurrentValues in interface org.apache.tez.runtime.library.api.KeyValuesReader

Throws:

IOException