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https://issues.apache.org/jira/browse/MAPREDUCE-875?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aaron Kimball updated MAPREDUCE-875:
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Status: Patch Available (was: Open)
Recycling patch again.. seems to have been dropped from the queue.
> Make DBRecordReader execute queries lazily
> ------------------------------------------
>
> Key: MAPREDUCE-875
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-875
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: Aaron Kimball
> Assignee: Aaron Kimball
> Attachments: MAPREDUCE-875.2.patch, MAPREDUCE-875.patch
>
>
> DBInputFormat's DBRecordReader executes the user's SQL query in the
> constructor. If the query is long-running, this can cause task timeout. The
> user is unable to spawn a background thread (e.g., in a MapRunnable) to
> inform Hadoop of on-going progress.
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