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https://issues.apache.org/jira/browse/HIVE-224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12841692#action_12841692
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James Warren commented on HIVE-224:
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think i bumped up against this or a related issue today - is there any plans on
incorporating this into a future release?
thanks,
-James
> implement lfu based flushing policy for map side aggregates
> -----------------------------------------------------------
>
> Key: HIVE-224
> URL: https://issues.apache.org/jira/browse/HIVE-224
> Project: Hadoop Hive
> Issue Type: Improvement
> Reporter: Joydeep Sen Sarma
>
> currently we flush some random set of rows when the map side hash table
> approaches memory limits.
> we have discussed a strategy of flushing hash table entries that have the
> been seen the least number of times (effectively LFU flushing strategy). This
> will be very effective at reducing the amount of data sent from map to reduce
> step - as well as reduce the chances for any skews.
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