[
https://issues.apache.org/jira/browse/MRUNIT-158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13494410#comment-13494410
]
Bertrand Dechoux commented on MRUNIT-158:
-----------------------------------------
I wouldn't put that as critical. I am not even sure that doing anything for
that subject would be a good thing.
Of course, a user friendly support of map would be nice but the underlying
issue is with Haddop implementation of MapWritable. As of 1.03, there is no
(overriding) implementation of toString(), equals() and hascode() methods. (see
HADOOP-7153)
MRunit could detect the type being a MapWritable and in that case use its own
definition of toString(), equals() and hashcode() but that would be a feature
and not a bug fixe and I would not really be favorable to it.
Maps are indeed nice to transfer 'dynamic data' but it implies that each object
carries its own typeless schema so that's not very efficient. You may want to
look at tuples instead (and at library such as Cascading.)
> withOutput doesn't generate useful information with MapWritable on error
> ------------------------------------------------------------------------
>
> Key: MRUNIT-158
> URL: https://issues.apache.org/jira/browse/MRUNIT-158
> Project: MRUnit
> Issue Type: Bug
> Affects Versions: 0.9.0
> Reporter: Patrick Hunt
> Priority: Critical
>
> Using withOutput generates the following, notice that the hashcode is printed
> rather than some useful detail as to the content of the maps:
> Nov 9, 2012 2:40:01 PM org.apache.hadoop.mrunit.TestDriver logError
> SEVERE: Missing expected output (null-0, org.apache.hadoop.io.MapWritable@e1)
> at position 0.
> Nov 9, 2012 2:40:01 PM org.apache.hadoop.mrunit.TestDriver logError
> SEVERE: Received unexpected output (null-0,
> org.apache.hadoop.io.MapWritable@2059) at position 0.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
