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From "Jonathan Hsieh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7848) Use ZK-based read/write lock to make flush-type snapshot robust against table enable/disable/alter
Date Thu, 04 Apr 2013 17:53:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13622574#comment-13622574
] 

Jonathan Hsieh commented on HBASE-7848:
---------------------------------------

We currently do not block writes/puts while snapshots are going on (and we don't really want
to from the client point of view).   The table locks are blocking changes to the table schema
and region splits and region merges.  

Future fancier snapshots may try to shrink the window of time where we do not honor snapshot/point
in time/causal consistency.
                
> Use ZK-based read/write lock to make flush-type snapshot robust against table enable/disable/alter
> --------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-7848
>                 URL: https://issues.apache.org/jira/browse/HBASE-7848
>             Project: HBase
>          Issue Type: Improvement
>          Components: snapshots
>    Affects Versions: 0.96.0
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>             Fix For: 0.95.0, 0.98.0
>
>         Attachments: 7848-v1.txt, 7848-v2.txt, hbase-7848_v2.patch, hbase-7848_v3.patch
>
>
> Current region split following flush would fail snapshot.
> We can utilize ZK-based read/write lock to make flush-type snapshot robust

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