[
https://issues.apache.org/jira/browse/PIG-460?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Amir Youssefi updated PIG-460:
------------------------------
Assignee: Benjamin Reed (was: Amir Youssefi)
Status: Patch Available (was: Open)
> PERFORMANCE: Order by done in 3 MR jobs, could be done in 2
> ------------------------------------------------------------
>
> Key: PIG-460
> URL: https://issues.apache.org/jira/browse/PIG-460
> Project: Pig
> Issue Type: Bug
> Affects Versions: types_branch
> Reporter: Alan Gates
> Assignee: Benjamin Reed
> Fix For: types_branch
>
> Attachments: sampler.patch
>
>
> Currently order by is done in three MR jobs:
> job 1: read data in whatever loader the user requests, store using BinStorage
> job 2: load using RandomSampleLoader, find quantiles
> job 3: load data again and sort
> It is done this way because RandomSampleLoader extends BinStorage, and so
> needs the data in that format to read it.
> If the logic in RandomSampleLoader was made into an operator instead of being
> in a loader then jobs 1 and 2 could be merged. On average job 1 takes about
> 15% of the time of an order by script.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
