[jira] Commented: (HADOOP-153) skip records that throw exceptions

["Devaraj Das (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12571528#action_12571528 ] 

Devaraj Das commented on HADOOP-153:
------------------------------------

Am starting to look at this issue. I am tending to handle this by only keeping track of how RecordReader.next behaves. This will take care of all cases - Java, Streaming, and Pipes in a generic manner. I am not very much in favor of providing hooks in the applications. Is that a requirement? Any other requirement? Thoughts welcome.

> skip records that throw exceptions
> ----------------------------------
>
>                 Key: HADOOP-153
>                 URL: https://issues.apache.org/jira/browse/HADOOP-153
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: mapred
>    Affects Versions: 0.2.0
>            Reporter: Doug Cutting
>            Assignee: Owen O'Malley
>
> MapReduce should skip records that throw exceptions.
> If the exception is thrown under RecordReader.next() then RecordReader implementations should automatically skip to the start of a subsequent record.
> Exceptions in map and reduce implementations can simply be logged, unless they happen under RecordWriter.write().  Cancelling partial output could be hard.  So such output errors will still result in task failure.
> This behaviour should be optional, but enabled by default.  A count of errors per task and job should be maintained and displayed in the web ui.  Perhaps if some percentage of records (>50%?) result in exceptions then the task should fail.  This would stop jobs early that are misconfigured or have buggy code.
> Thoughts?

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