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Posted to issues@hbase.apache.org by "Phabricator (Commented) (JIRA)" <ji...@apache.org> on 2012/02/16 20:27:02 UTC
[jira] [Commented] (HBASE-5414) Assign different memstoreTS to
different KV's in the same WALEdit during replay
[ https://issues.apache.org/jira/browse/HBASE-5414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13209640#comment-13209640 ]
Phabricator commented on HBASE-5414:
------------------------------------
aaiyer has commented on the revision "HBASE-5414 [jira] Assign different memstoreTS to different KV's in the same WALEdit during replay".
INLINE COMMENTS
:2839 TBD: fix comments length.
REVISION DETAIL
https://reviews.facebook.net/D1749
> Assign different memstoreTS to different KV's in the same WALEdit during replay
> -------------------------------------------------------------------------------
>
> Key: HBASE-5414
> URL: https://issues.apache.org/jira/browse/HBASE-5414
> Project: HBase
> Issue Type: Sub-task
> Components: client, coprocessors, regionserver
> Reporter: Amitanand Aiyer
> Fix For: 0.94.0
>
> Attachments: HBASE-5414.D1749.1.patch
>
>
> HBASE-5203 combines all the different Puts/Deletes into one WALEdit. This is
> required to ensure that we persist the atomic mutation in its enterity and not
> in parts.
> When combined into a single WALEdit, we create one big familyMap that is a combination
> of all the family maps in the mutations. The KV's in this familyMap have no information
> about memstoreTS (it is not yet assigned).
> However, when we apply the mutations to the Memstore (if there are no failures) we end up
> incrementing the memstoreTS for each operation.
> This can lead to the client seeing different order of operations -- depending on weather or
> not there was a RS crash/restart.
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