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From "NITIN VERMA (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-17460) enable_table_replication can not perform cyclic replication of a table
Date Fri, 13 Jan 2017 08:51:26 GMT
NITIN VERMA created HBASE-17460:
-----------------------------------

             Summary: 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


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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