[jira] [Commented] (MAPREDUCE-6194) Bubble up final exception in failures during creation of output collectors

["Harsh J (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14245807#comment-14245807 ] 

Harsh J commented on MAPREDUCE-6194:
------------------------------------

If someone would like to try working on this, the file to edit is {{hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/MapTask.java}}, and essentially we'd want some variable storing the last WARNed exception and rethrowing that at the end with a wrapped message such as "Final error in constructing the collector was:".

A more clever impl. could include messages from each of the attempt exceptions, collecting them all, but the above would usually do for most of users only using the standard single/pair of collectors.

> Bubble up final exception in failures during creation of output collectors
> --------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-6194
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6194
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: task
>    Affects Versions: 2.6.0
>            Reporter: Harsh J
>            Priority: Minor
>              Labels: newbie
>
> MAPREDUCE-5974 added in ability to instantiate multiple OCs, but if none of them are able to load it "throws" only a final a generic message: {{"Unable to initialize any output collector"}}
> The older behaviour was to throw the actual instantiation exception back, so it makes it to client logs with an actual meaningful error.
> Now the clients need to go take a look at the task's logs to find the WARNs that represent the failure in instantiation.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)