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https://issues.apache.org/jira/browse/CRUNCH-545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14632859#comment-14632859
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Josh Wills commented on CRUNCH-545:
-----------------------------------
+1
> 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
> 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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