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https://issues.apache.org/jira/browse/HBASE-5509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13221787#comment-13221787
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Lars Hofhansl commented on HBASE-5509:
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bq. For sameFile(), I think false should be returned for dest file in the
following case:{code}
+ //return true if checksum is not supported
+ //(i.e. some of the checksums is null)
{code}
Not sure I agree with that. The method comment says that if either FS does not
support checksums and that check is ignored. I.e. if any of the earlier tests
(like size comparison) did not flag the files as different they are considered
equal).
> 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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