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https://issues.apache.org/jira/browse/MAPREDUCE-4522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15170675#comment-15170675
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Shyam Gavulla commented on MAPREDUCE-4522:
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Re-posting to all users
I am a newbie and this is my first post here. I looked at the issue and code
and I want to propose another solution.
We could accumulate the keys in DBRecordWriter#write() into a collection and in
DBRecordWriter#close() we could do a batch insert of 500 or 1000 keys in single
batch. This is not ideal, but might help with large inserts and update the
progress.
I would like to provide a patch if this solution is acceptable.
> DBOutputFormat Times out on large batch inserts
> -----------------------------------------------
>
> Key: MAPREDUCE-4522
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4522
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: task-controller
> Affects Versions: 0.20.205.0
> Reporter: Nathan Jarus
> Labels: newbie
>
> In DBRecordWriter#close(), progress is never updated. In large batch inserts,
> this can cause the reduce task to time out due to the amount of time it takes
> the SQL engine to process that insert.
> Potential solutions I can see:
> Don't batch inserts; do the insert when DBRecordWriter#write() is called
> (awful)
> Spin up a thread in DBRecordWriter#close() and update progress in that.
> (gross)
> I can provide code for either if you're interested.
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