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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5241) Deletes should not mask Puts that come after it.
Date Wed, 15 Feb 2012 20:27:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13208765#comment-13208765
] 

Lars Hofhansl commented on HBASE-5241:
--------------------------------------

I fear we'd have two chronological dimensions now. One as indicated by the timestamps and
another indicated by the order in which the changes are physically applied (memstoreTS).

This "problem" is really only a problem when Deletes are dated into the future or Puts are
dated in the past. Any app doing this must be aware of the implications.
It just seems like a non-issue to me :)

Replication is just happens to be a place where I can see problems. I'm sure there're more
(multi actions, etc).
Is the memstoreTS written to the WAL? (Replication uses WAL shipping).

                
> Deletes should not mask Puts that come after it.
> ------------------------------------------------
>
>                 Key: HBASE-5241
>                 URL: https://issues.apache.org/jira/browse/HBASE-5241
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Amitanand Aiyer
>         Attachments: HBASE-5241.D1731.1.patch
>
>
> Suppose that we have a delete row, and then followed by the put. The delete row
> can mask the put, unless there was a major compaction in between.
> Now that we are flushing the memstoreTS to disk, along with the KVs, we should be able
> to differentiate whether or not the Put happened after the Delete and offer better 
> delete semantics.
> Couldn't find a pre-existing JIRA that already discusses this, so creating one.
> Seems related to https://issues.apache.org/jira/browse/HBASE-2406, but is not quite the
same.

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