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From "Matteo Bertozzi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10926) Use global procedure to flush table memstore cache
Date Thu, 12 Jun 2014 21:47:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14029882#comment-14029882
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Matteo Bertozzi commented on HBASE-10926:
-----------------------------------------

The warn means that someone joined the procedure "later", which in this case is not really
a problem.
but more in general it is part of the problem described in HBASE-11221. once the procedure
start it is not aware of the new server joining or regions moving. I'm working on a patch,
but I'm stuck in finding a way to make it compatible for a rolling restart.

> Use global procedure to flush table memstore cache
> --------------------------------------------------
>
>                 Key: HBASE-10926
>                 URL: https://issues.apache.org/jira/browse/HBASE-10926
>             Project: HBase
>          Issue Type: Improvement
>          Components: Admin
>    Affects Versions: 0.96.2, 0.98.1
>            Reporter: Jerry He
>            Assignee: Jerry He
>             Fix For: 0.99.0
>
>         Attachments: HBASE-10926-trunk-v1.patch, HBASE-10926-trunk-v2.patch, HBASE-10926-trunk-v3.patch,
HBASE-10926-trunk-v4.patch
>
>
> Currently, user can trigger table flush through hbase shell or HBaseAdmin API.  To flush
the table cache, each region server hosting the regions is contacted and flushed sequentially,
which is less efficient.
> In HBase snapshot global procedure is used to coordinate and flush the regions in a distributed
way.
> Let's provide a distributed table flush for general use.



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