Hey All, I've noticed that the Cassandra instance I have running on our build machine occasionally crashes with an OOM error during compaction. I'm going to dial down the memtable thresholds etc but I was wondering if anyone could help explain the heap usage at the time of the crash. I just happened to leave a JMX console window open and it's showing that just before the crash roughly 50% of the heap was still available.
Screenshot of heap usage: http://img3.imageshack.us/img3/2822/memoryf.png The above screenshot was taken a few weeks ago on Cassandra 0.7.2 (I think) with nmap disabled on Java 1.6.0_24-b07. I'm now running 0.7.4 with nmap enabled and just got the same crash (based on the error message in the log)... Log snippet from crash that matches screenshot: http://pastebin.com/ACa8fKUu Log snippet from 0.7.4 crash: http://pastebin.com/SwSQawUM Cheers, -- Dan Washusen
