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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-153) skip records that throw exceptions
Date Thu, 20 Apr 2006 17:41:05 GMT
skip records that throw exceptions

         Key: HADOOP-153
         URL: http://issues.apache.org/jira/browse/HADOOP-153
     Project: Hadoop
        Type: New Feature

  Components: mapred  
    Reporter: Doug Cutting

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.


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