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From "chunhui shen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8780) a column Family can have VERSIONS less than zero
Date Mon, 22 Jul 2013 01:56:49 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13714857#comment-13714857
] 

chunhui shen commented on HBASE-8780:
-------------------------------------

Patch v2 looks good to me.

+1 
                
> a column Family can have VERSIONS less than zero 
> -------------------------------------------------
>
>                 Key: HBASE-8780
>                 URL: https://issues.apache.org/jira/browse/HBASE-8780
>             Project: HBase
>          Issue Type: Bug
>          Components: Client
>    Affects Versions: 0.94.8
>            Reporter: Demai Ni
>            Assignee: Demai Ni
>            Priority: Trivial
>         Attachments: HBASE-8780-0.94.8-v0.patch, HBASE-8780-test.txt, HBASE-8780-trunk.patch,
HBASE-8780-trunk.patch, HBASE-8780-trunk-v1.patch, HBASE-8780-trunk-v2.patch
>
>
> User can create/alter a columnfam and set its VERSION(aka maxVERSIONS) to a negative
or zero value. Although there is a checking in HColumnDesciptor#construtor, hbase shell command
will invoke the setter(setMaxVersions and setMinVersions) directly, hence by pass the checking.
 For example:
> {code:title=set VERSIONS = -1}
> hbase(main):016:0> create 't5_dn',{NAME=>'cf1',VERSIONS=>-1}
> 0 row(s) in 1.0420 seconds
> hbase(main):017:0> put 't5_dn','row1','cf1:q1','row1cf1_v1'
> 0 row(s) in 0.0700 seconds
> hbase(main):018:0> scan 't5_dn'
> ROW                   COLUMN+CELL                                              
> 0 row(s) in 0.0090 seconds
> hbase(main):019:0> describe 't5_dn'
> DESCRIPTION                                          ENABLED                    
> 't5_dn', {NAME => 'cf1', REPLICATION_SCOPE => '0',  true                      
> KEEP_DELETED_CELLS => 'false', COMPRESSION => 'NONE                           

> ', ENCODE_ON_DISK => 'true', BLOCKCACHE => 'true',                            
> MIN_VERSIONS => '0', DATA_BLOCK_ENCODING => 'NONE',                           

>  IN_MEMORY => 'false', BLOOMFILTER => 'NONE', TTL =                           

> > '2147483647', VERSIONS => '-1', BLOCKSIZE => '655                        
   
> 36'}                                                                          
> 1 row(s) in 0.0410 seconds
> {code}
> above example shows VERSIONS => '-1', and put/scan doesn't keep the data

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