[
https://issues.apache.org/jira/browse/HIVE-12492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sergey Shelukhin updated HIVE-12492:
------------------------------------
Fix Version/s: (was: 2.0.0)
Removing the fixed version from an uncommitted JIRA while unassigning the JIRAs
from 2.0 release. Please set Target Version, if needed.
> MapJoin: 4 million unique integers seems to be a probe plateau
> --------------------------------------------------------------
>
> Key: HIVE-12492
> URL: https://issues.apache.org/jira/browse/HIVE-12492
> Project: Hive
> Issue Type: Improvement
> Components: Query Planning
> Affects Versions: 1.3.0, 1.2.1, 2.0.0
> Reporter: Gopal V
> Assignee: Gopal V
>
> After 4 million keys, the map-join implementation seems to suffer from a
> performance degradation.
> The hashtable build & probe time makes this very inefficient, even if the
> data is very compact (i.e 2 ints).
> Falling back onto the shuffle join or bucket map-join is useful after 2^22
> items.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
