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Posted to issues@hbase.apache.org by "ryan rawson (Commented) (JIRA)" <ji...@apache.org> on 2011/10/02 00:08:34 UTC

[jira] [Commented] (HBASE-4344) Persist memstoreTS to disk

    [ https://issues.apache.org/jira/browse/HBASE-4344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13118919#comment-13118919 ] 

ryan rawson commented on HBASE-4344:
------------------------------------

what happened to the solution to TestAcidGuarantee w/o adding extra stuff to the disk format?
                
> Persist memstoreTS to disk
> --------------------------
>
>                 Key: HBASE-4344
>                 URL: https://issues.apache.org/jira/browse/HBASE-4344
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Amitanand Aiyer
>            Assignee: Amitanand Aiyer
>             Fix For: 0.89.20100924
>
>         Attachments: 4344-v10.txt, 4344-v11.txt, 4344-v12.txt, 4344-v2.txt, 4344-v4.txt, 4344-v5.txt, 4344-v6.txt, 4344-v7.txt, 4344-v8.txt, 4344-v9.txt, patch-2
>
>
> Atomicity can be achieved in two ways -- (i) by using  a multiversion concurrency system (MVCC), or (ii) by ensuring that "new" writes do not complete, until the "old" reads complete.
> Currently, Memstore uses something along the lines of MVCC (called RWCC for read-write-consistency-control). But, this mechanism is not incorporated for the key-values written to the disk, as they do not include the memstore TS.
> Let us make the two approaches be similar, by persisting the memstoreTS along with the key-value when it is written to the disk.

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