[jira] [Updated] (TEZ-2879) While grouping splits, allow an alternate list of preferred locations to be provided per split

["Siddharth Seth (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TEZ-2879?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Siddharth Seth updated TEZ-2879:
--------------------------------
    Attachment: TEZ-2879.1.wip.txt

WIP patch. I'm going to see if it makes more sense to get TEZ-1692 out of the way before finalizing the patch here, to avoid duplication.

> While grouping splits, allow an alternate list of preferred locations to be provided per split
> ----------------------------------------------------------------------------------------------
>
>                 Key: TEZ-2879
>                 URL: https://issues.apache.org/jira/browse/TEZ-2879
>             Project: Apache Tez
>          Issue Type: Improvement
>            Reporter: Siddharth Seth
>            Assignee: Siddharth Seth
>         Attachments: TEZ-2879.1.wip.txt
>
>
> Split locations - at least for FileInputSplits - are generally tied to the location on HDFS where the split resides.
> There are situations in which this location is not necessarily the best location to process this split.
> e.g.
> Clusters where compute and storage are separate.
> Systems which cache data - cache affinity is more important.
> Providing an alternate list of preferred locations allows grouping to the preferred locations, instead of always grouping based on the locations specified in the split.



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