[jira] [Created] (HBASE-8771) ensure replication_scope's value is either local(0) or global(1)

["Demai Ni (JIRA)" <ji...@apache.org>]

Demai Ni created HBASE-8771:
-------------------------------

             Summary: ensure replication_scope's value is either local(0) or global(1)
                 Key: HBASE-8771
                 URL: https://issues.apache.org/jira/browse/HBASE-8771
             Project: HBase
          Issue Type: Bug
          Components: Replication
    Affects Versions: 0.94.8
            Reporter: Demai Ni
            Priority: Minor
             Fix For: 0.94.9


For replication_scope, only two values are meaningful:
{code} 
  public static final int REPLICATION_SCOPE_LOCAL = 0;
  public static final int REPLICATION_SCOPE_GLOBAL = 1;
{code} 
However, there is no checking for that, so currently user can set it to any integer value. And all non-zero value will be treated as 1(GLOBAL). 

This jira is to add a checking in HColumnDescriptor#setScope() so that only 0 and 1 will be accept during create_table or alter_table. 

In the future, we can leverage replication_scope to store for info. For example: 
-1: A columnfam is replicated from another cluster in MASTER_SLAVE setup (i.e readonly)
2 : A columnfam is set MASTER_MASTER
Probably a major improve JIRA is needed for the future usage. It will be good to ensure the scope value at this moment. 
{code:title=Testing|borderStyle=solid}
hbase(main):002:0> create 't1_dn',{NAME=>'cf1',REPLICATION_SCOPE=>2}

ERROR: java.lang.IllegalArgumentException: Replication Scope must be either 0(local) or 1(global)
...

hbase(main):004:0> alter 't1_dn',{NAME=>'cf1',REPLICATION_SCOPE=>-1}

ERROR: java.lang.IllegalArgumentException: Replication Scope must be either 0(local) or 1(global)
...
{code} 





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