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https://issues.apache.org/jira/browse/HBASE-5241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13212214#comment-13212214
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Todd Lipcon commented on HBASE-5241:
------------------------------------
{quote}
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.
{quote}
What are the "better semantics" that we would offer? ie, if I do:
- put value "a" at ts=1
- delete at ts=3
- put value "b" at ts=2
and I do a read with "current time" semantics, do you expect to see "b" or
nothing? I'm not convinced that "b" is a "better semantic" here, except for the
point that it makes major compaction more transparent. The transparency of
compaction is sort of nice, but compaction is already not transparent because
of time travel reads (except for the "always keep versions" stuff that we did
recently)
> 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
> Assignee: Amitanand Aiyer
> Attachments: HBASE-5241.D1731.1.patch, HBASE-5241.D1731.2.patch,
> HBASE-5241.D1731.3.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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