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https://issues.apache.org/jira/browse/TAJO-1271?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jinho Kim resolved TAJO-1271.
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Resolution: Fixed
Fix Version/s: 0.11.1
0.12.0
committed it
Thank you for your review!
> Improve memory usage of Hash-shuffle
> ------------------------------------
>
> Key: TAJO-1271
> URL: https://issues.apache.org/jira/browse/TAJO-1271
> Project: Tajo
> Issue Type: Improvement
> Components: Data Shuffle
> Affects Versions: 0.9.0
> Reporter: Jinho Kim
> Assignee: Jinho Kim
> Fix For: 0.12.0, 0.11.1
>
>
> Currently, Hash-shuffle keeps intermediate file appender and tuple list in
> memory and the required memory will be in proportion to the input size
> If input size is 10GB, the hash-join key partition count will be 78125 (10TB
> / 128MB) and the required memory is 10GB (78125 * 128KB).
> We should improve the hash-shuffle file writer as following :
> * Separate the buffer from the file writer
> * Keep the tuples in off-heap buffer and reuse the buffer
> * Flush the buffers, if total buffer capacity is required more than
> maxBufferSize
> * Write the partition files asynchronously
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