Are you seeing any sort of log messages from Cassandra at all?
On Wed, Jun 23, 2010 at 2:26 PM, Sean Bridges <sean.brid...@gmail.com> wrote: > We were running a load test against a single 0.6.2 cassandra node. 24 > hours into the test, Cassandra appeared to be nearly frozen for 10 > minutes. Our write rate went to almost 0, and we had a large number > of write timeouts. We weren't swapping or gc'ing at the time. > > It looks like the problems were caused by our memtables flushing after > 24 hours (we have MemtableFlushAfterMinutes=1440). Some of our column > families are written to infrequently so that they don't hit the flush > thresholds in MemtableOperationsInMillions and MemtableThroughputInMB. > After 24 hours we had ~3000 commit log files. > > Is this flushing causing Cassandra to become unresponsive? I would > have thought Cassandra could flush in the background without blocking > new writes. > > Thanks, > > Sean >
