[
https://issues.apache.org/jira/browse/PIG-2771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13402439#comment-13402439
]
Mathias Herberts commented on PIG-2771:
---------------------------------------
Sorry, I had missed it, I'm not using 0.10 yet due to PIG-2760.
> Extend LoadPushDown to push limit info to the LoadFunc
> ------------------------------------------------------
>
> Key: PIG-2771
> URL: https://issues.apache.org/jira/browse/PIG-2771
> Project: Pig
> Issue Type: Improvement
> Reporter: Mathias Herberts
> Priority: Minor
>
> It is not uncommon to use LIMIT clauses just after a LOAD, especially during
> the development phase of new scripts.
> The current behaviour is to do the LIMIT in the map phase just after the
> LOAD, this means that the output of each Mapper has indeed N records if a
> 'LIMIT x N' was used, but the LoadFunc has read all the records in its splits.
> A nice optimization would be to push to the LoadFunc the fact that only the
> first N records are needed, this way the LOAD would terminate as soon as each
> Mapper have produced N records, which can speed up things quite a bit when
> input is large.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
