Alexander, thanks for your reply! 1) I've set erlang.distribution.nettick_time to 1 second and writes after netsplit are very fast now. So this point is resolved. Do you know how this parameter affects false positive ratio? Riak docs stay that every nettick_time seconds netkernal will initiate remote processes life-checking. However, it does not say anything about the mechanism. Do you know how this failure detector works? 2) As for hinted handoff, I still can not find any solution. Variables that I've tried to change: - vnode_management_timer from 10s to 1s - transfer_limit from 2 to 100 But still transfer take about a minute. Any other variables that I should take a look at?
2017-02-22 21:12 GMT+03:00 Alexander Sicular <sicul...@basho.com>: > 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 <andrers...@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 >> _______________________________________________ >> riak-users mailing list >> riak-users@lists.basho.com >> http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com >> > -- > > > Alexander Sicular > Solutions Architect > Basho Technologies > 9175130679 > @siculars > -- С уважением, Ершов Андрей
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