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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10571) TTL of zero should be rejected
Date Thu, 20 Feb 2014 01:03:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13906403#comment-13906403

Andrew Purtell commented on HBASE-10571:

bq. Looking at HColumnDescriptor, it's a bit of a mess. We check some of the parameters, but
not all, and on top of that only in a constructor that marked deprecated in favor of using
setters, which in turn do no validation.

This is my point. The scope of the issue is bigger than just TTL. 

> TTL of zero should be rejected
> ------------------------------
>                 Key: HBASE-10571
>                 URL: https://issues.apache.org/jira/browse/HBASE-10571
>             Project: HBase
>          Issue Type: Bug
>          Components: Admin
>    Affects Versions: 0.94.16,
>            Reporter: Jeremy Carroll
> If a table schema has been modified to provide a default TTL, or a TTL on a column of
0, then HBase basically becomes a very costly way to send your data to /dev/null.
> I'm proposing that we reject outright any attempt to set a TTL on a default table schema,
or column of a value of zero. I cannot think of a use case where individuals would want to
delete their keys as soon as they are written to the memstore. In addition, this will protect
against any bugs in code, or documentation errors which would result in irrecoverable data
> Example:
> hbase(main):001:0> create 'test_table', { NAME => 'd', TTL => 0 }
> 0 row(s) in 1.7880 seconds
> hbase(main):003:0> put 'test_table', 'row1', 'd', '1'
> 0 row(s) in 0.1300 seconds
> hbase(main):004:0> scan 'test_table'
> ROW                                            COLUMN+CELL                          
> 0 row(s) in 0.0320 seconds

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