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Posted to issues@hbase.apache.org by "Amitanand Aiyer (JIRA)" <ji...@apache.org> on 2011/09/07 20:45:17 UTC

[jira] [Updated] (HBASE-4345) Ensure that Scanners that read from the storefiles respect MVCC

     [ https://issues.apache.org/jira/browse/HBASE-4345?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Amitanand Aiyer updated HBASE-4345:
-----------------------------------

    Attachment: patch-3

To enforce the read-write consistency mechanism, we need to ignore all key-values that have a memstoreTS greater than the read point for the get/scan operation.

Filters provide an excellent mechanism to ignore values based on any desired condition. We implement the RWCC mechanism for the key-values read from the disk by including a filter for the scan object that ignores "newer" reads.

> Ensure that Scanners that read from the storefiles respect MVCC
> ---------------------------------------------------------------
>
>                 Key: HBASE-4345
>                 URL: https://issues.apache.org/jira/browse/HBASE-4345
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Amitanand Aiyer
>             Fix For: 0.89.20100924
>
>         Attachments: patch-3
>
>
> Currently, the key-values written to the disk do not include the MVCC (RWCC) version information. Once we add that
> information, and make it persistent to disk; let us make the scanners respect the MVCC mechanism by ignoring 
> "newer" writes.

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