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Date: Sat, 3 Mar 2012 01:07:58 +0000 (UTC)
From: "Lars Hofhansl (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-5509) MR based copier for copying HFiles
 (trunk version)
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    [ https://issues.apache.org/jira/browse/HBASE-5509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13221404#comment-13221404 ] 

Lars Hofhansl commented on HBASE-5509:
--------------------------------------

It's not ready for RB. Note that this *is* the Facebook patch ported to trunk with the changes I mentioned. All points Ted mentioned are from the FB patch.

The types of comment I am looking for are: 1. do we want to this route at all  2. general comments on failure scenarios.
Then I can go and clean up the finer points.

                
> MR based copier for copying HFiles (trunk version)
> --------------------------------------------------
>
>                 Key: HBASE-5509
>                 URL: https://issues.apache.org/jira/browse/HBASE-5509
>             Project: HBase
>          Issue Type: Sub-task
>          Components: documentation, regionserver
>            Reporter: Karthik Ranganathan
>            Assignee: Lars Hofhansl
>             Fix For: 0.94.0, 0.96.0
>
>         Attachments: 5509.txt
>
>
> This copier is a modification of the distcp tool in HDFS. It does the following:
> 1. List out all the regions in the HBase cluster for the required table
> 2. Write the above out to a file
> 3. Each mapper 
>    3.1 lists all the HFiles for a given region by querying the regionserver
>    3.2 copies all the HFiles
>    3.3 outputs success if the copy succeeded, failure otherwise. Failed regions are retried in another loop
> 4. Mappers are placed on nodes which have maximum locality for a given region to speed up copying

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