[jira] [Resolved] (CRUNCH-545) Writing to HFiles starts a job per column family

["Gabriel Reid (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CRUNCH-545?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gabriel Reid resolved CRUNCH-545.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 0.13.0

Pushed to master

> Writing to HFiles starts a job per column family
> ------------------------------------------------
>
>                 Key: CRUNCH-545
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-545
>             Project: Crunch
>          Issue Type: Improvement
>            Reporter: Gabriel Reid
>            Assignee: Gabriel Reid
>             Fix For: 0.13.0
>
>         Attachments: CRUNCH-545.patch, post.dot.png, pre.dot.png
>
>
> When writing to HFiles via {{HFileUtils.writeToHFilesForIncrementalLoad}}, a separate MR job is started up per column family defined for the table, regardless of whether or not there is any data for each of these column families.
> Each of the column family jobs runs over the full set of Cells, filters for the desired column family, and then partitions the data.
> For tables with multiple column families, it would be a lot more efficient to sort/partition all of the data together, and then split it out per column family afterwards.



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