cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Rob Coli <>
Subject Re: one node with very high loads
Date Mon, 27 Aug 2012 21:12:13 GMT
On Mon, Aug 27, 2012 at 9:25 AM, Senthilvel Rangaswamy
<> wrote:
> We are running 1.1.2 on m1.xlarge with ephemeral store for data. We are
> seeing very high loads on one of the nodes in the ring, 30+.

My first hunch would be that you are sending all client requests to
this one node, so it is coordinating 30x as many requests as it

If that's not the case, if I were you I would attempt to determine if
the high i/o is high read or write on the node, via a tool like iotop.
You can also compare the tpstats of two nodes with similar uptimes to
see if your node is performing more of any stage than other members of
its cohort.

Once you determine whether it's read or write, determine which files
are being read or written.. :)


=Robert Coli
YAHOO - rcoli.palominob
SKYPE - rcoli_palominodb

View raw message