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From "Karthik Ranganathan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5509) MR based copier for copying HFiles (trunk version)
Date Tue, 19 Jun 2012 04:53:43 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13396510#comment-13396510
] 

Karthik Ranganathan commented on HBASE-5509:
--------------------------------------------

@Lars - I ripped out some code which used the hardlinking - we have implemented it internally.
I believe we are planning on opensourcing this, otherwise you'd have to wait for native hardlinks.
The current copy approach still works though for a few tens of TB's.
                
> 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
>         Attachments: 5509-v2.txt, 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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