Unexpected Riak 1.3 crash

Matthew Von-Maszewski matthewv at basho.com
Fri Apr 12 11:17:52 EDT 2013

The fastest fix is to lower the cache_size in app.config to 8,388,608 and see what happens.

Next is to lower the max_open_files to 30 in app.config.  

7G Ram is tight.


On Apr 11, 2013, at 10:24 PM, thefosk <marco at mashape.com> wrote:

> OS process not running. I think that the whole cluster crashes because the
> other nodes suddenly experience an increased traffic, which makes them crash
> as well.
> This happened on 1.3.1 also, but for some days now everything seems to be
> stable. I guess the main reason why this was happening and may happen again,
> is because Riak is taking too much memory from the system. This is the usage
> that I experience on a random machine in my cluster, when no M/R jobs are
> running:
> Cpu(s):  0.2%us,  0.1%sy,  0.0%ni, 99.7%id,  0.0%wa,  0.0%hi,  0.0%si, 
> 0.0%st
> Mem:   7118944k total,  6619652k used,   499292k free,    11304k buffers
> Swap:        0k total,        0k used,        0k free,  3173148k cached
>  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                                                   
> 11392 riak      20   0 8917m 3.2g  40m S  2.7 46.5   2080:41 beam.smp 
> When M/R jobs are running, almost the whole memory is full. I wonder if
> there is a way to tell Riak to use less memory, at the cost of having slower
> queries. By the way I also think my cluster is over provisioned. As stated
> in the GitHub issue:
> The cluster is made of 4 machines, 64 partitions, and n_val=2. Each server
> has an average of 60GB of data stored. The machines are EC2 High CPU extra
> large instances (c1.xlarge), as such they have:
> 7 GiB of memory
> 20 EC2 Compute Units (8 virtual cores with 2.5 EC2 Compute Units each)
> --
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> Sent from the Riak Users mailing list archive at Nabble.com.
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