Hi Alex. It looks like you exceeded the files ulimit. Information on how to fix is here
http://docs.basho.com/riak/latest/ops/tuning/open-files-limit/#Changing-the-limit Jon > On Dec 3, 2014, at 7:15 AM, Alex Millar <a...@gobonfire.com> wrote: > > Good morning Riak-Users > > Last night one of the nodes in my 5 node RiakCS cluster went haywire and shot > up to +90% disk i/o utilization seemingly out of the blue. > > Looking at the riak error.log I saw the following being continuously written. > > 2014-12-02 21:57:13.220 [error] <0.29210.3089> CRASH REPORT Process > <0.29210.3089> with 0 neighbours exited with reason: no match of right hand > value {error,{db_open,"IO error: > /var/lib/riak/anti_entropy/570899077082383952423314387779798054553098649600/CURRENT: > Too many open files"}} in hashtree:new_segment_store/2 line 505 in > gen_server:init_it/6 line 328 > 2014-12-02 21:57:13.226 [error] <0.29211.3089> CRASH REPORT Process > <0.29211.3089> with 0 neighbours exited with reason: no match of right hand > value {error,{db_open,"IO error: > /var/lib/riak/anti_entropy/776422744832042175295707567380525354192214163456/LOCK: > Too many open files"}} in hashtree:new_segment_store/2 line 505 in > gen_server:init_it/6 line 328 > 2014-12-02 21:57:13.226 [error] <0.29212.3089> CRASH REPORT Process > <0.29212.3089> with 0 neighbours exited with reason: no match of right hand > value {error,{db_open,"IO error: > /var/lib/riak/anti_entropy/570899077082383952423314387779798054553098649600/CURRENT: > Too many open files"}} in hashtree:new_segment_store/2 line 505 in > gen_server:init_it/6 line 328 > 2014-12-02 21:57:13.226 [error] <0.29213.3089> CRASH REPORT Process > <0.29213.3089> with 0 neighbours exited with reason: no match of right hand > value {error,{db_open,"IO error: > /var/lib/riak/anti_entropy/776422744832042175295707567380525354192214163456/CURRENT: > Too many open files"}} in hashtree:new_segment_store/2 line 505 in > gen_server:init_it/6 line 328 > 2014-12-02 21:57:13.286 [error] <0.29215.3089> CRASH REPORT Process > <0.29215.3089> with 0 neighbours exited with reason: no match of right hand > value {error,{db_open,"IO error: > /var/lib/riak/anti_entropy/776422744832042175295707567380525354192214163456/LOCK: > Too many open files"}} in hashtree:new_segment_store/2 line 505 in > gen_server:init_it/6 line 328 > 2014-12-02 21:57:13.286 [error] <0.29214.3089> CRASH REPORT Process > <0.29214.3089> with 0 neighbours exited with reason: no match of right hand > value {error,{db_open,"IO error: > /var/lib/riak/anti_entropy/570899077082383952423314387779798054553098649600/LOCK: > Too many open files"}} in hashtree:new_segment_store/2 line 505 in > gen_server:init_it/6 line 328 > 2014-12-02 21:57:13.286 [error] <0.29217.3089> CRASH REPORT Process > <0.29217.3089> with 0 neighbours exited with reason: no match of right hand > value {error,{db_open,"IO error: > /var/lib/riak/anti_entropy/570899077082383952423314387779798054553098649600/LOCK: > Too many open files"}} in hashtree:new_segment_store/2 line 505 in > gen_server:init_it/6 line 328 > 2014-12-02 21:57:13.287 [error] <0.29216.3089> CRASH REPORT Process > <0.29216.3089> with 0 neighbours exited with reason: no match of right hand > value {error,{db_open,"IO error: > /var/lib/riak/anti_entropy/776422744832042175295707567380525354192214163456/LOCK: > Too many open files"}} in hashtree:new_segment_store/2 line 505 in > gen_server:init_it/6 line 328 > 2014-12-02 21:57:13.312 [error] <0.29219.3089> CRASH REPORT Process > <0.29219.3089> with 0 neighbours exited with reason: no match of right hand > value {error,{db_open,"IO error: > /var/lib/riak/anti_entropy/570899077082383952423314387779798054553098649600/LOCK: > Too many open files"}} in hashtree:new_segment_store/2 line 505 in > gen_server:init_it/6 line 328 > 2014-12-02 21:57:15.634 [error] <0.29218.3089> CRASH REPORT Process > <0.29218.3089> with 0 neighbours exited with reason: no match of right hand > value {error,{db_open,"IO error: > /var/lib/riak/anti_entropy/776422744832042175295707567380525354192214163456/CURRENT: > Too many open files"}} in hashtree:new_segment_store/2 line 505 in > gen_server:init_it/6 line 328 > > Leading up to this there didn’t appear to be any significant load on our > cluster. > > I simply restarted the node and the issue went away but I wanted to reach out > to get some help as to why / how this arose in the first place. > > Regards, > > Alex Millar, CTO > Office: 1-800-354-8010 ext. 704 > Mobile: 519-729-2539 > GoBonfire.com > _______________________________________________ > riak-users mailing list > riak-users@lists.basho.com > http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
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