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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 Sun, 04 Sep 2011 03:23:09 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13096799#comment-13096799

stack commented on HBASE-4224:

@Akash Thanks for volunteering.  I don't think this one too hard to do.  You'll be able to
figure it.  Study what happens when you flush in the shell.  See how it passes a command to
the master.  In master, see how it fans it out by region or by table.  I think whats needed
is a flush command that takes a machine name.  The shell code would figure distingush the
flush of a region or table from a flush of a regionserver (a bit of regexing should be able
to distingush whats wanted -- I'd imagine the flush a machine would take a ServerName; i.e.
<hostname> ',' <port> ',' <startcode>).  The flush of a regionserver would
require adding a new API to HRegionInterface I'd imagine.  It'd flush all regions on the regionserver.
 Then on the end, after all flushed, it'd run the check if we can let go of WAL logs.  This
method currently is checked on WAL log roll.  See in the HLog under the wal package.  Ask
questions if you help figuring stuff.  Thanks Akash.

> 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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