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From Todd Lipcon <t...@cloudera.com>
Subject Re: requests count per HRegion and rebalance
Date Mon, 07 Feb 2011 18:59:20 GMT
some of the info

Unfortunately you can't get at any of the really juicy details like CMS FLS
statistics :(


On Mon, Feb 7, 2011 at 10:49 AM, tsuna <tsunanet@gmail.com> wrote:

> On Mon, Feb 7, 2011 at 10:26 AM, Ted Yu <yuzhihong@gmail.com> wrote:
> > About 'number of GC cycles per GC type', is there API to get this
> > information ?
> As far as I know this is only exposed through JMX.  I'm sure there is
> a way to use some horrible APIs in the JDK to "efficiently" access JMX
> stuff from the local JVM.  If there's another way than JMX, I'd love
> to know.
> The way I collect HBase metrics for OpenTSDB is to use the Sun private
> API to attach to the JVM and get a JXM URL, even if the VM wasn't
> configured to expose any JMX thing on a port.  I think under the hood
> it starts a thread in the remote JVM to handle RMI calls that probably
> go over the loopback interface.  This is pretty much how jconsole and
> friends work, BTW.  Pretty horrible stuff.  :(
> --
> Benoit "tsuna" Sigoure
> Software Engineer @ www.StumbleUpon.com

Todd Lipcon
Software Engineer, Cloudera

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