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Posted to issues@hbase.apache.org by "binlijin (JIRA)" <ji...@apache.org> on 2016/06/20 15:25:05 UTC

[jira] [Commented] (HBASE-16067) Add READ_COMMITTED IsolationLevel for scan and the current is SNAPSHOT.

    [ https://issues.apache.org/jira/browse/HBASE-16067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15339706#comment-15339706 ] 

binlijin commented on HBASE-16067:
----------------------------------

Update scan's MVCC before every row it will impact the performance, so trigger the update before every scan.next.

> Add READ_COMMITTED IsolationLevel for scan and the current is SNAPSHOT.
> -----------------------------------------------------------------------
>
>                 Key: HBASE-16067
>                 URL: https://issues.apache.org/jira/browse/HBASE-16067
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: binlijin
>         Attachments: HBASE-16067.patch
>
>
> When scan a region, openScan get a mvcc readpoint and do not advance the readpoint within it lifetime, so all committed write after the readpoint do not visible for the scan.



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