[jira] [Commented] (HBASE-3999) book.xml - Compression Upgrade Concerns

["Doug Meil (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-3999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13444237#comment-13444237 ] 

Doug Meil commented on HBASE-3999:
----------------------------------

Agree with closing.
                
> book.xml - Compression Upgrade Concerns 
> ----------------------------------------
>
>                 Key: HBASE-3999
>                 URL: https://issues.apache.org/jira/browse/HBASE-3999
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Doug Meil
>            Assignee: Jean-Daniel Cryans
>            Priority: Minor
>
> Spawned from comment on HBASE-3998
> (snip)
> Jean-Daniel Cryans added a comment - 16/Jun/11 18:00
> We should also add something about what happens when altering a family that was uncompressed to LZO or GZ, and vice versa. This just came up in the IRC channel: if I enable compression on a column family that was not previously compressed, what is needed to get the existing data in that column family compressed ?
> (snip)
> I'd suggest putting a new section under Appendix/Compression called something like "Upgrade Considerations" because this could either be compression algorithm upgrades (LZO->new version of LZO), or schema changes (as JD pointed out) where you are changing compression algorithms.

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