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From "Gomathivinayagam Muthuvinayagam (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11715) HBase should provide a tool to compare 2 remote tables.
Date Fri, 15 Aug 2014 02:36:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14098079#comment-14098079
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Gomathivinayagam Muthuvinayagam commented on HBASE-11715:
---------------------------------------------------------

I am interested in working on this task. Merkle tree, we need to constantly to run some background
service, and it will require additional amount of data. Can you provide more details, I can
assign it to myself and work on this? 

Thank you.

> HBase should provide a tool to compare 2 remote tables.
> -------------------------------------------------------
>
>                 Key: HBASE-11715
>                 URL: https://issues.apache.org/jira/browse/HBASE-11715
>             Project: HBase
>          Issue Type: New Feature
>          Components: util
>            Reporter: Jean-Marc Spaggiari
>
> As discussed in the mailing list, when a table is copied to another cluster and need
to be validated against the first one, only VerifyReplication can be used. However, this can
be very long since data need to be copied again.
> We should provide an easier and faster way to compare the tables. 
> One option is to calculate hashs per ranges. User can define number of buckets, then
we split the table into this number of buckets and calculate an hash for each (Like partitioner
is already doing). We can also optionally calculate an overall CRC to reduce even more hash
collision. 



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