Re: Garbage collector launched on all nodes at once

2015-06-17 Thread Jonathan Haddad
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 wrote: > okay, iirc memtable has been removed off heap, google and got this > http://www.datastax.com/dev/bl

Re: Garbage collector launched on all nodes at once

2015-06-17 Thread Jason Wee
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 wrote: > It is probably this: https://issues.apache.org/ji

Re: Garbage collector launched on all nodes at once

2015-06-17 Thread Marcus Eriksson
It is probably this: https://issues.apache.org/jira/browse/CASSANDRA-9549 On Wed, Jun 17, 2015 at 7:37 PM, Michał Łowicki 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 ar

Re: Garbage collector launched on all nodes at once

2015-06-17 Thread Michał Łowicki
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 wrote: > Hi, > > Two datacenters with 6 no

Garbage collector launched on all nodes at once

2015-06-17 Thread Michał Łowicki
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, Micha