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Date: Wed, 31 Jul 2013 02:41:51 +0000 (UTC)
From: "Demai Ni (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12653780.1371667263934.141630.1375238511002@arcas>
In-Reply-To: <JIRA.12653780.1371667263934@arcas>
References: <JIRA.12653780.1371667263934@arcas>
Subject: [jira] [Commented] (HBASE-8771) ensure replication_scope's value is
 either local(0) or global(1)
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    [ https://issues.apache.org/jira/browse/HBASE-8771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13724787#comment-13724787 ] 

Demai Ni commented on HBASE-8771:
---------------------------------

[~ctrezzo], probably I don't fully understand the usage of replication_scope. Can someone help me to understand the routing information when the scope is some value other than 1 or 0? in what scenario, users will use value such as 2, or -1? many thanks 
                
> 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
>            Assignee: Demai Ni
>            Priority: Minor
>             Fix For: 0.94.11
>
>         Attachments: HBASE-8771-0.94.8-v0.patch
>
>
> 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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