Memory Errors when using RiakCS

Ben Rudolph brudolph at dimagi.com
Mon Nov 23 13:30:13 EST 2015


Hi,

We've been trying to setup RiakCS for storing files on our website,
http://commcarehq.org/. It's been difficult for us to deploy because we've
been having issues with our servers not being able to start Riak due to
memory errors. Here's what a traceback looks like when I try and start Riak
with `riak-console`:

config is OK
> -config /var/lib/riak-cs/generated.configs/app.2015.11.23.18.11.17.config
> -args_file /var/lib/riak-cs/generated.configs/vm.2015.11.23.18.11.17.args
> -vm_args /var/lib/riak-cs/generated.configs/vm.2015.11.23.18.11.17.args
> Exec:  /usr/lib/riak-cs/erts-5.10.3/bin/erlexec -boot
> /usr/lib/riak-cs/releases/2.0.1/riak-cs               -config
> /var/lib/riak-cs/generated.configs/app.2015.11.23.18.11.17.config
> -args_file /var/lib/riak-cs/generated.configs/vm.2015.11.23.18.11.17.args
> -vm_args /var/lib/riak-cs/generated.configs/vm.2015.11.23.18.11.17.args
>          -pa /usr/lib/riak-cs/lib/basho-patches -- console
> Root: /usr/lib/riak-cs
> Erlang R16B02_basho8 (erts-5.10.3) [source] [64-bit] [smp:8:8]
> [async-threads:64] [kernel-poll:true] [frame-pointer]
>
> =INFO REPORT==== 23-Nov-2015::18:11:18 ===
>     alarm_handler: {set,{system_memory_high_watermark,[]}}
> =INFO REPORT==== 23-Nov-2015::18:11:18 ===
> opening log file: "/var/log/riak-cs/access.log.2015_11_23_18"
> Eshell V5.10.3  (abort with ^G)
> (**)1> [os_mon] memory supervisor port (memsup): Erlang has closed



The machines we are trying to deploy to have 8GB of RAM and also running a
few other services, but have 3-4GB of RAM available. Are there any
configuration params we can use so it consumes less memory? I've taken a
look at the `system_memory_high_watermark` which is the error we see (
http://docs.basho.com/riak/latest/ops/running/recovery/errors/). Our
configs can be found here in case that's useful:

https://github.com/dimagi/commcarehq-ansible/tree/riak/ansible/roles/riakcs/templates

Any insight would be useful! Thank you!

Ben
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