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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-153) skip records that fail Task
Date Mon, 11 Aug 2008 10:47:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12621407#action_12621407
] 

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

Sharad, sorry for the late comment - one small change I would like to see - the updates to
the counters MAP_PROCESSED_RECORDS and REDUCE_PROCESSED_RECORDS should happen in the test/skip
mode only.

> skip records that fail Task
> ---------------------------
>
>                 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: Sharad Agarwal
>             Fix For: 0.19.0
>
>         Attachments: 153_1.patch, 153_2.patch, 153_3.patch, 153_4.patch, 153_5.patch,
153_6.patch, 153_7.patch, 153_8.patch, skipRecords_wip1.patch
>
>
> 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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