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From "Aaron Kimball (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-875) Make DBRecordReader execute queries lazily
Date Tue, 25 Aug 2009 17:43:59 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12747511#action_12747511
] 

Aaron Kimball commented on MAPREDUCE-875:
-----------------------------------------

No new tests because it's a very small code change; existing Sqoop unit tests cover this and
pass.

Core test failure is unrelated.


> 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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