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From "Ashish Singhi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17460) enable_table_replication can not perform cyclic replication of a table
Date Mon, 16 Jan 2017 05:34:26 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15823480#comment-15823480
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Ashish Singhi commented on HBASE-17460:
---------------------------------------

Isn't it sufficient to check only whether the names of CFs for which Replication is set is
same or not across the cluster for replicating the table data ? If yes, then I think  just
adding a method in ReplicationAdmin class which checks this is sufficient.

> enable_table_replication can not perform cyclic replication of a table
> ----------------------------------------------------------------------
>
>                 Key: HBASE-17460
>                 URL: https://issues.apache.org/jira/browse/HBASE-17460
>             Project: HBase
>          Issue Type: Bug
>          Components: Replication
>            Reporter: NITIN VERMA
>            Assignee: NITIN VERMA
>              Labels: replication
>         Attachments: HBASE-17460.patch
>
>   Original Estimate: 96h
>  Remaining Estimate: 96h
>
> The enable_table_replication operation is broken for cyclic replication of HBase table
as we compare all the properties of column families (including REPLICATION_SCOPE). 
> Below is exactly what happens:
> 1.  Running "enable_table_replication 'table1'  " opeartion on first cluster will set
the REPLICATION_SCOPE of all column families to peer id '1'. This will also create a table
on second cluster where REPLICATION_SCOPE is still set to peer id '0'.
> 2. Now when we run "enable_table_replication 'table1'" on second cluster, we compare
all the properties of table (including REPLICATION_SCOPE_, which obviously is different now.

> I am proposing a fix for this issue where we should avoid comparing REPLICATION_SCOPE
inside HColumnDescriotor::compareTo() method, especially when replication is not already enabled
on the desired table.
> I have made that change and it is working. I will submit the patch soon.



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