Hi,
We have a simple 3 node test cluster, and we are seeing this cluster fall-over
under quite modest loads, 2-3 times a day with the node reporting out of memory
problems.
Our basic details are:
* Riak 1.4.9
* 3 nodes, each being:
o A virtual RedHat EL
o 2 x 2.2GHz CPU
o 4GB RAM
* In-memory back end
* 128 segment ring
We have tried to limit the in-memory max memory by the following setting in
app.config:
%% Memory Config
{memory_backend, [
{max_memory, 32}, %% 32 megabytes
{ttl, 86400} %% 1 Day in seconds
]},
The behaviour we are seeing is a sudden and rapid increase in memory allocated
to riak, up to 100% available RAM, and then a crash.
This is happening on all 3 nodes (at different times).
When looking through the console.log just prior to the out of memory / crash we
see log entries similar to the following appearing:
2015-02-11 16:50:27.356 [info]
<0.98.0>@riak_core_sysmon_handler:handle_event:92 monitor large_heap <0.238.0>
[{name,riak_core_gossip},{initial_call,{riak_core_gossip,init,1}},{almost_current_function,{riak_core_gossip,update_gossip_vers
ion,1}},{message_queue_len,78}]
[{old_heap_block_size,0},{heap_block_size,47828850},{mbuf_size,0},{stack_size,15},{old_heap_size,0},{heap_size,13944475}]
We can't see any errors at the appropriate times in the error.log
We see the following in erlang.log.1:
===== ALIVE Wed Feb 11 17:00:24 GMT 2015
/usr/lib64/riak/lib/os_mon-2.2.9/priv/bin/memsup: Erlang has closed.
Erlang has closed
Crash dump was written to: /var/log/riak/erl_crash.dump
eheap_alloc: Cannot allocate 4454408120 bytes of memory
=====
Anyone any ideas?
Simon Hartley
Solutions Architect
Email: [email protected]<mailto:[email protected]>
Skype: +44 (0)113 397 6747
Skype: sijomons
William Hill Online, St. Johns, Merrion St. Leeds, LS2 8LQ
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