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From "Demai Ni (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-8780) a column Family can have VERSIONS less than zero
Date Fri, 21 Jun 2013 01:59:20 GMT
Demai Ni created HBASE-8780:

             Summary: 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
            Priority: Trivial

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                            
1 row(s) in 0.0410 seconds

above example shows VERSIONS => '-1', and put/scan doesn't keep the data

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