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From "Lars George (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-17635) enable_table_replication script cannot handle replication scope
Date Sat, 11 Feb 2017 14:00:44 GMT
Lars George created HBASE-17635:
-----------------------------------

             Summary: enable_table_replication script cannot handle replication scope
                 Key: HBASE-17635
                 URL: https://issues.apache.org/jira/browse/HBASE-17635
             Project: HBase
          Issue Type: Bug
          Components: Replication
    Affects Versions: 1.3.1
            Reporter: Lars George


When you add a peer, then enable a table for replication using {{enable_table_replication}},
the script will create the table on the peer cluster, but with one difference:

_Master Cluster_:

{noformat}
hbase(main):027:0> describe 'testtable'
Table testtable is ENABLED                                                               
                                                                                         
                        
testtable                                                                                
                                                                                         
                        
COLUMN FAMILIES DESCRIPTION                                                              
                                                                                         
                        
{NAME => 'cf1', DATA_BLOCK_ENCODING => 'NONE', BLOOMFILTER => 'ROW', REPLICATION_SCOPE
=> '1', VERSIONS => '1', COMPRESSION => 'NONE', MIN_VERSIONS => '0', TTL =>
'FOREVER', KEEP_DELETED_CELLS => 'FALSE',
 BLOCKSIZE => '65536', IN_MEMORY => 'false', BLOCKCACHE => 'true'}              
                                                                                         
                                 
1 row(s) in 0.0700 seconds
{noformat}

_Peer Cluster_:
{noformat}
hbase(main):003:0> describe 'testtable'
Table testtable is ENABLED                                                               
                                                                                         
                        
testtable                                                                                
                                                                                         
                        
COLUMN FAMILIES DESCRIPTION                                                              
                                                                                         
                        
{NAME => 'cf1', DATA_BLOCK_ENCODING => 'NONE', BLOOMFILTER => 'ROW', REPLICATION_SCOPE
=> '0', COMPRESSION => 'NONE', VERSIONS => '1', TTL => 'FOREVER', MIN_VERSIONS
=> '0', KEEP_DELETED_CELLS => 'FALSE',
 BLOCKSIZE => '65536', IN_MEMORY => 'false', BLOCKCACHE => 'true'}              
                                                                                         
                                 
1 row(s) in 0.1260 seconds
{noformat}

Note that the replication scope is different. Removing the peer, adding it again and enabling
the table gives this now:

{noformat}
hbase(main):026:0> enable_table_replication 'testtable'

ERROR: Table testtable exists in peer cluster 1, but the table descriptors are not same when
compared with source cluster. Thus can not enable the table's replication switch.
{noformat}

That is dumb, as it was the same script that enabled the replication scope in the first place.
It should skip that particular attribute when comparing the cluster schemas.




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