[HBASE-17460] enable_table_replication can not perform cyclic replication of a table

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 1.4.0, 2.0.0
• Component/s: Replication
• Labels: replication
• Hadoop Flags: Reviewed
• Assignee: NITIN VERMA
• Reporter: NITIN VERMA
• Created: 13/Jan/17 08:50
• Updated: 14/Apr/17 15:47
• Resolved: 08/Mar/17 15:01

Description

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.

Issue Links

• is duplicated by: HBASE-17635 enable_table_replication script cannot handle replication scope
• is related to: HBASE-17779 disable_table_replication returns misleading message and does not turn off replication