CDH4.1.2 HBase 0.92.1 HDFS 2.0.0
Every 3 hours, our production HBase cluster does something that causes all the data nodes to have a sustained spike in CPU/network/disk. The spike lasts about 30 mins, and during this time the cluster has greatly increased latencies for our typical application usage. I can't find anything in our application that would have such a periodic and significant behavior. Is there anything that HBase/HDFS might be doing on it's own that would cause this? We're on the default schedule for major compactions, but I thought that was daily. Any ideas what could be causing this? Thanks, Patrick
