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https://issues.apache.org/jira/browse/HBASE-8780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13694536#comment-13694536
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Demai Ni commented on HBASE-8780:
---------------------------------
Anoop, thanks. for some reason, when I followed the 'test results' links above,
a 404 error popped up. anyway, I am currently traveling around and have very
limited access to my code and testing environment. I will look into this once
back to office, in 2~3 weeks. sorry for the delay
> 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
>
>
> 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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