network spike every 2 hours

[Jeff Whiting]

We have a hadoop cluster that is only running hbase.  We recently installed ganglia to monitor those 
servers.  Looking over the network graphs about every 2 hours there is a very large spike.  Before 
the spike we are pushing about 5mb but during the spikes it is around 60-100mb.  I'm pretty sure we 
aren't running anything, is hbase doing something that could cause those spikes?

Thanks,
~Jeff
--
Jeff Whiting
Qualtrics Senior Software Engineer
je...@qualtrics.com