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From "Aaron Kimball (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-875) Make DBRecordReader execute queries lazily
Date Fri, 14 Aug 2009 23:11:15 GMT
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.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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