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https://issues.apache.org/jira/browse/MAPREDUCE-1486?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aaron Kimball updated MAPREDUCE-1486:
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Status: Patch Available (was: Open)
> 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
> Attachments: MAPREDUCE-1486.patch
>
>
> 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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