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From "Jerry He (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 17:27:30 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7848?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13622550#comment-13622550
] 

Jerry He commented on HBASE-7848:
---------------------------------

Hi, Ted, Jonathan
bq. My initial thought was that we take the write lock when we essentially want to exclusively
modify meta (split, move, create, enable/disable), 

This is probably a general question on snapshot and specific to this TableLock. During snapshot,
with this TableLock, do we block writes/puts going into the table/memstore?
or it is done thru other mechanism?
                
> 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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