Make DBRecordReader execute queries lazily
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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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