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From "Buckley,Ron" <buckl...@oclc.org>
Subject RE: HBase Region Server Spinning on JMX requests
Date Wed, 24 Apr 2013 11:37:59 GMT
I created https://issues.apache.org/jira/browse/HBASE-8416

We're not using OpenTSDB, but we do have something similar grabbing the
jmx data on a regular basis.

Eventually, we moved all the regions off of that region server.  We left
it spinning overnight, going to try to look at it this morning.

-----Original Message-----
From: Kevin O'dell [mailto:kevin.odell@cloudera.com] 
Sent: Tuesday, April 23, 2013 11:04 PM
To: user@hbase.apache.org; lars hofhansl
Subject: Re: HBase Region Server Spinning on JMX requests

Hi Ron,

  Are you using OpenTSDB?  I have seen:

https://issues.apache.org/jira/browse/HBASE-6602 (which should be
addressed in your build).  One possibility is that the Tcollector is
leaving lots of connections open and causing the spin.  Unfortunately,
we have not been able to nail it down further.  We are thinking
Metrics2 in trunk might inadvertently take care of this issue.

On Tue, Apr 23, 2013 at 6:57 PM, lars hofhansl <larsh@apache.org> wrote:
> Hmm... That's not good. Would you mind filing a ticket here:
https://issues.apache.org/jira/browse/HBASE ?
> -- Lars
> ________________________________
>  From: "Buckley,Ron" <buckleyr@oclc.org>
> To: user@hbase.apache.org
> Sent: Tuesday, April 23, 2013 6:57 AM
> Subject: HBase Region Server Spinning on JMX requests
> This is with HBase 0.94.4 & CDH 4.1.1
> This morning one our region servers (we have 44) stopped responding to
> the '/jmx' request. (It's working for regular activity.)
> the region server is now using all the CPU on the host, running all 8
> cores at 100%.
> I've got several jstacks, they all look like this:
> http://pastebin.com/dGTmTEN7
> If I do a wget of the /jmx url, it starts responding, but never
> completes, always stopping at the same point:
> http://pastebin.com/qhNvxrQK
> Has anyone ever seen this before? If so, Is there a way out of it?
> (other than bouncing the region server).
> BTW: There's nothing relevant in the region server log and the garbage
> collector log is normal.
> ----------------------------------------------------------------------
> Ron Buckley

Kevin O'Dell
Systems Engineer, Cloudera

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