How much memory do you have? Recently people have been seeing really great performance using G1GC with heaps > 8GB and offheap memtable objects.
On Thu, Jun 18, 2015 at 1:31 AM Jason Wee <peich...@gmail.com> wrote: > okay, iirc memtable has been removed off heap, google and got this > http://www.datastax.com/dev/blog/off-heap-memtables-in-Cassandra-2-1 > apparently, there are still some reference on heap. > > On Thu, Jun 18, 2015 at 1:11 PM, Marcus Eriksson <krum...@gmail.com> > wrote: > >> It is probably this: https://issues.apache.org/jira/browse/CASSANDRA-9549 >> >> On Wed, Jun 17, 2015 at 7:37 PM, Michał Łowicki <mlowi...@gmail.com> >> wrote: >> >>> Looks that memtable heap size is growing on some nodes rapidly ( >>> https://www.dropbox.com/s/3brloiy3fqang1r/Screenshot%202015-06-17%2019.21.49.png?dl=0). >>> Drops are the places when nodes have been restarted. >>> >>> On Wed, Jun 17, 2015 at 6:53 PM, Michał Łowicki <mlowi...@gmail.com> >>> wrote: >>> >>>> Hi, >>>> >>>> Two datacenters with 6 nodes (2.1.6) each. In each DC garbage >>>> collection is launched at the same time on each node (See [1] for total GC >>>> duration per 5 seconds). RF is set to 3. Any ideas? >>>> >>>> [1] >>>> https://www.dropbox.com/s/bsbyew1jxbe3dgo/Screenshot%202015-06-17%2018.49.48.png?dl=0 >>>> >>>> -- >>>> BR, >>>> Michał Łowicki >>>> >>> >>> >>> >>> -- >>> BR, >>> Michał Łowicki >>> >> >> >
