Re: Garbage collector launched on all nodes at once
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
Re: Garbage collector launched on all nodes at once
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
Re: Garbage collector launched on all nodes at once
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
Re: Garbage collector launched on all nodes at once
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
Garbage collector launched on all nodes at once
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
