[jira] [Commented] (CRUNCH-660) FileTargetImpl uses Distcp vs FileUtils.copy

["Andrew Olson (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CRUNCH-660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16740686#comment-16740686 ] 

Andrew Olson commented on CRUNCH-660:
-------------------------------------

I've implemented a basic version of this solution after finding it beneficial for jobs writing to S3. I can attach a patch in the near future.

> FileTargetImpl uses Distcp vs FileUtils.copy
> --------------------------------------------
>
>                 Key: CRUNCH-660
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-660
>             Project: Crunch
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Micah Whitacre
>            Assignee: Josh Wills
>            Priority: Major
>
> So for handling multiple runtimes I'm not sure there is a way to solve this but documenting as a JIRA regardless.
> If you are running in a multi-cluster environment where you might want to read data from one cluster and then write the output on another cluster (e.g. generating HFiles to be loaded into a separate HBase cluster), the performance of moving files is noticeable.  Specifically due to the fact that the moving of the files happens in the launcher/driver process versus as part of the node execution it seems.[1]
> An efficient option would be to kick off a DistCp instead but that would tie the target directly to a runtime which is not a great approach.  
> [1] - https://github.com/apache/crunch/blob/5609b014378d3460a55ce25522f0c00659872807/crunch-core/src/main/java/org/apache/crunch/io/impl/FileTargetImpl.java#L157



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