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From "Aaron Kimball (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1486) Configuration data should be preserved within the same MapTask
Date Fri, 12 Feb 2010 02:12:27 GMT
Configuration data should be preserved within the same MapTask

                 Key: MAPREDUCE-1486
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1486
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: task
            Reporter: Aaron Kimball
            Assignee: Aaron Kimball

Map tasks involve a number of Contexts -- at least a TaskAttemptContext and a MapContext.
These context objects contain a Configuration each; when one context is initialized, it initializes
its own Configuration by deep-copying a previous Configuration.

If one Context instance is used entirely prior to a second, more specific Context then the
second Context should contain the configuration data initialized in the previous Context.
This specifically affects the interaction between an InputFormat and its RecordReader instance(s).

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