[
https://issues.apache.org/jira/browse/HBASE-9879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13812126#comment-13812126
]
Jean-Marc Spaggiari commented on HBASE-9879:
--------------------------------------------
The same way idempotency is broken when someone send puts or increments to a
table from into a mapreduce task. People need to know what they are using. So
if they set this parameter to a table, then they know how it's going to work.
Very useful with the timestamp is set by the client applicatoin and not HBase.
That will also allow to update a specific version of a specific cell. Today
it's not possible to do that. You have to do a delete, flush, compaction and
put. With this option, you will only have to do a put and that will
automatically overwrite the previous one. Usefull when you keep a state as the
last version of a cell, but you want to look at the history of the
modifications, and want to update one of them...
> 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.
--
This message was sent by Atlassian JIRA
(v6.1#6144)
