2.0.3: system tables have a 1 hour memtable_flush_period which I have observed to trigger compaction on the 4 hour mark. Going by memory tho... -ml
On Tue, Dec 10, 2013 at 10:31 AM, Andre Sprenger <andre.spren...@getanet.de>wrote: > As far as I know there is nothing hard coded in Cassandra that kicks in > every 4 hours. Turn on GC logging, maybe dump the output of jstats to a > file and correlate this data with the Cassandra logs. Cassandra logs are > pretty good in telling you what is going on. > > > 2013/12/10 Joel Samuelsson <samuelsson.j...@gmail.com> > >> Hello, >> >> We've been having a lot of problems with extremely long GC (and still do) >> which I've asked about several times on this list (I can find links to >> those discussions if anyone is interested). >> We noticed a pattern that the GC pauses may be related to something >> happening every 4 hours. Is there anything specific happening within >> Cassandra with a 4 hour interval? >> >> Any help is much appreciated, >> Joel Samuelsson >> > >
