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From "stack (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5414) Assign different memstoreTS to different KV's in the same WALEdit during replay
Date Thu, 16 Feb 2012 20:08:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13209684#comment-13209684
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stack commented on HBASE-5414:
------------------------------

bq. ....can guarantee that the Put wins over the Delete even though both happened at the same
NOW timestamp

Trying to understand... I don't get it Kannan.  If they both went in together at same TS,
doesn't the Delete sort before the Put so we'd see it first... so it would overshadow the
contemporaneous Put?
                
> 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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