Testing netsplit in Riak

Alexander Sicular siculars at basho.com
Wed Feb 22 13:12:24 EST 2017

1. Check the erlang vm variable "nettick", I believe.

2. Hinted handoff resource allocation are configurable via config file or
at runtime.

On Wed, Feb 22, 2017 at 12:07 Andrey Ershov <andrershov at gmail.com> wrote:

> Hi, guys!
> I'm testing netsplit in Riak and can not achieve satisfiable behaviour.
> I've just two nodes cluster and bucket with the following settings n=3,
> w=2, r=2. And I have just a couple of entries.
> Basically I have two problems:
> 1) After the split, writes on one side of the partition start lagging
> hard. It takes more than 1 minute for the first write to be become
> successful. I understand that this is related to the process of setting up
> backup vnodes in Riak, but is any way to speed up the process?  Which
> configuration parameters influence that?
> 2) More weird problem is after netsplit. "riak-admin transfers" command
> immediately reports that there should 5 partition transfers from one node
> to another and 5 partition transfers in the opposite direction. But active
> transfers output is empty!
> I've put a watch on this command and active transfers are always empty.
> Finally, it takes several minutes for Riak to finish hinted handoff.
> Several minutes just for several keys!
> What Riak is doing all this time? Anyway to speed up the process?
> 3) The reason why I'm concerned about hinted-handoff speed is because, I
> noticed that until this process finishes, I read stale data on both sides
> of ex-netsplit.
> --
> Thanks,
> Andrey
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> riak-users at lists.basho.com
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Alexander Sicular
Solutions Architect
Basho Technologies
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