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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5414) Assign different memstoreTS to different KV's in the same WALEdit during replay
Date Wed, 21 Mar 2012 17:49:42 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13234587#comment-13234587
] 

Lars Hofhansl commented on HBASE-5414:
--------------------------------------

@Amit: You want this in 0.94? Is it ready?
                
> 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
>            Assignee: 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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