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From "Zhihong Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5509) MR based copier for copying HFiles (trunk version)
Date Sat, 03 Mar 2012 02:37:57 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13221478#comment-13221478
] 

Zhihong Yu commented on HBASE-5509:
-----------------------------------

I think Karthick may tell us something about the failure scenarios they have handled through
this approach :-)

SnapshotMR.FileReporter's run() method only sleeps. What purpose does FileReporter serve ?
{code}
+   * Map method. Copies one file from source file system to destination.
{code}
The above is inaccurate: every file returned from SnapshotUtilities.getStoreFileList() is
copied.
                
> 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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