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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4224) Need a flush by regionserver rather than by table option
Date Thu, 18 Aug 2011 07:16:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13086846#comment-13086846
] 

stack commented on HBASE-4224:
------------------------------

An important bit I left off the top is that this 'flush by regionserver' needs to also clean
up WAL logs too after the flushing is done.  If everything has been flushed, then should be
able to clean up any outstanding WAL logs.

Scenario is the following. Your hosting service tells you that they are going to do a risky
operation that could cause you to lose network connectivity or power to your racks.  You know
that a disaster may be coming and you want to mitigate the damage.

A facility that flushed and cleaned up all WAL logs by the regionserver (so could throttle
i/o) so if bad crash there is little to replay is what I'm talking about here.

> Need a flush by regionserver rather than by table option
> --------------------------------------------------------
>
>                 Key: HBASE-4224
>                 URL: https://issues.apache.org/jira/browse/HBASE-4224
>             Project: HBase
>          Issue Type: Bug
>          Components: shell
>            Reporter: stack
>
> This evening needed to clean out logs on the cluster.  logs are by regionserver.  to
let go of logs, we need to have all edits emptied from memory.  only flush is by table or
region.  We need to be able to flush the regionserver.  Need to add this.

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