Amir Youssefi updated PIG-460:

    Assignee: Amir Youssefi  (was: Benjamin Reed)
      Status: Open  (was: Patch Available)

> 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: Amir Youssefi
>             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.

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