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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9879) Can't undelete a KeyValue
Date Wed, 06 Nov 2013 23:17:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13815432#comment-13815432
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Enis Soztutar commented on HBASE-9879:
--------------------------------------

bq. There was support in the recent PMC meeting for deprecating client set timestamps. Existing
tables would grandfather a setting that allows user set timestamps but new tables would not
allow them. Allowing clients to (ab)use cell timestamps leads to several problems not just
this known issue.
Opened HBASE-9905 for discussing that. 

> Can't undelete a KeyValue
> -------------------------
>
>                 Key: HBASE-9879
>                 URL: https://issues.apache.org/jira/browse/HBASE-9879
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.96.0
>            Reporter: Benoit Sigoure
>
> Test scenario:
> put(KV, timestamp=100)
> put(KV, timestamp=200)
> delete(KV, timestamp=200, with MutationProto.DeleteType.DELETE_ONE_VERSION)
> get(KV) => returns value at timestamp=100 (OK)
> put(KV, timestamp=200)
> get(KV) => returns value at timestamp=100 (but not the one at timestamp=200 that was
"reborn" by the previous put)
> Is that normal?
> I ran into this bug while running the integration tests at https://github.com/OpenTSDB/asynchbase/pull/60
– the first time you run it, it passes, but after that, it keeps failing.  Sorry I don't
have the corresponding HTable-based code but that should be fairly easy to write.
> I only tested this with 0.96.0, dunno yet how this behaved in prior releases.
> My hunch is that the tombstone added by the DELETE_ONE_VERSION keeps shadowing the value
even after it's reborn.



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