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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 Tue, 29 Apr 2014 03:38:19 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13983950#comment-13983950

Matteo Bertozzi commented on HBASE-10926:

{quote}We don't need to have the agreement or consistency to flush across region servers anyway.
Any concern?{quote}
ok, I read the description of this jira. and what you really want is just broadcasting a command
to all the regions. not using a two-phase commit like system.

If you look at HBASE-9864, there is some agreement to implement two notification systems.

a two-phase commit one for broadcasting operations like grant/revoke on every region server
(the procedure),
and another one which is just a "state change" notification, which doesn't require strong
guarantees, which will probably be used by quotas as HBASE-11059.

since you have already done the patch, and all the code seems to be isolated in procedure/flush
i guess is fine if you just use acquireBarrier() to do the flush

> 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
> 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
> Let's provide a distributed table flush for general use.

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