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Posted to issues@tajo.apache.org by "Hyunsik Choi (JIRA)" <ji...@apache.org> on 2016/05/03 22:17:13 UTC

[jira] [Updated] (TAJO-1058) Implement off-heap hash table for hash aggregation

     [ https://issues.apache.org/jira/browse/TAJO-1058?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyunsik Choi updated TAJO-1058:
-------------------------------
    Assignee:     (was: Hyunsik Choi)

> Implement off-heap hash table for hash aggregation
> --------------------------------------------------
>
>                 Key: TAJO-1058
>                 URL: https://issues.apache.org/jira/browse/TAJO-1058
>             Project: Tajo
>          Issue Type: Sub-task
>          Components: Physical Operator
>            Reporter: Hyunsik Choi
>              Labels: block_iteration
>             Fix For: block_iteration
>
>
> See the title.
> Currently, we use HashMap for hash aggregation. It causes GC overheads when the number of distinct hash keys is over tens of millions. We need to implement an alternative to the current implementation. This implementation should consider block iteration addressed in TAJO-1041.



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