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https://issues.apache.org/jira/browse/MRUNIT-129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13674113#comment-13674113
]
Hudson commented on MRUNIT-129:
-------------------------------
Integrated in mrunit-trunk #881 (See
[https://builds.apache.org/job/mrunit-trunk/881/])
MRUNIT-129: Key object re-use in Reducer is inconsistent with MapReduce
behaviour (new API) (Revision 08bbdfd5295e617f956f31937976f7b75ed60378)
Result = SUCCESS
brock :
https://git-wip-us.apache.org/repos/asf?p=mrunit.git&a=commit&h=08bbdfd5295e617f956f31937976f7b75ed60378
Files :
* src/main/java/org/apache/hadoop/mrunit/mapreduce/ReduceDriver.java
*
src/test/java/org/apache/hadoop/mrunit/mapreduce/TestReducerInputValueReuse.java
* src/test/java/org/apache/hadoop/mrunit/mapreduce/TestReduceDriver.java
* src/test/java/org/apache/hadoop/mrunit/mapreduce/TestReduceFeeder.java
* src/test/java/org/apache/hadoop/mrunit/mapreduce/TestMapReduceDriver.java
* src/main/java/org/apache/hadoop/mrunit/types/KeyValueReuseList.java
* src/main/java/org/apache/hadoop/mrunit/mapreduce/ReduceFeeder.java
* src/main/java/org/apache/hadoop/mrunit/mapreduce/MapReduceDriver.java
* src/main/java/org/apache/hadoop/mrunit/TestDriver.java
* src/test/java/org/apache/hadoop/mrunit/internal/util/TestStringUtils.java
*
src/main/java/org/apache/hadoop/mrunit/internal/mapreduce/MockReduceContextWrapper.java
* src/test/java/org/apache/hadoop/mrunit/types/TestKeyValueReuseList.java
* src/main/java/org/apache/hadoop/mrunit/internal/util/StringUtils.java
> Key object re-use in Reducer is inconsistent with MapReduce behaviour (new
> API)
> -------------------------------------------------------------------------------
>
> Key: MRUNIT-129
> URL: https://issues.apache.org/jira/browse/MRUNIT-129
> Project: MRUnit
> Issue Type: Bug
> Affects Versions: 0.9.0
> Reporter: Dave Beech
> Assignee: Paulin Sanselme
> Fix For: 1.1.0
>
> Attachments: JIRA_129.patch, MRUNIT-129.unittest.patch
>
>
> Follow on issue from MRUNIT-127, also relating to grouping comparators.
> In the new MapReduce API Reducer's reduce method, you are passed a reference
> to a key and an Iterable for the values. What's not particularly clear is
> that as you iterate through the values, the value of the key is also changing
> silently. This is not usually noticeable, since the keys that were grouped
> often have the same value anyway, but with a custom grouping comparator this
> isn't necessarily the case.
> This is different to the old API, where you would get the first key in the
> group and this wouldn't change as you iterate over the values.
> MRUnit uses the "old API" style behaviour for both old and new APIs, so some
> unit tests may not give a consistent result to an actual mapreduce job.
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