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From "Pranav Khaitan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3276) delete followed by a put with the same timestamp
Date Fri, 26 Nov 2010 00:43:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12935917#action_12935917

Pranav Khaitan commented on HBASE-3276:

Kannan, this is easy. I can take care of this.

> delete followed by a put with the same timestamp
> ------------------------------------------------
>                 Key: HBASE-3276
>                 URL: https://issues.apache.org/jira/browse/HBASE-3276
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Kannan Muthukkaruppan
>            Assignee: Kannan Muthukkaruppan
> [Note: This issue is relevant only for cases that don't use the default "time" based
versions, but provide/manage versions explicitly.]
> The fix for HBASE-1485 ensures that if there are multiple puts with the same timestamp
the later one wins.
> However, if there is a delete for a specific timestamp, then the later put doesn't win.

> Say for example the following is the sequence of operations:
> put                         row/col/v1 - value1
> deleteColumn     row/col/v1
> put                         row/col/v1 - value2
> Without the deleteColumn(), HBASE-1485 ensures that "value2" is the winner.
> However, with the deleteColumn() thrown into the mix, the delete wins, and one cannot
insert a new value at that version. [The only, unsatisfactory, workaround at this point seems
to be trigger a major compaction. The major compact would clear the delete marker, and allow
new cells to be created with that version again.] 
> ---
> Seems like it might not be too complicated to extend the fix for HBASE-1485 to also respect
ordering between delete/put operations. I'll look into this further.

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