riak exiting when number partitions > 128

David Lowell dave at go2ctv.com
Mon Oct 8 21:00:38 EDT 2012


I'm starting to want to move past the default Riak configs, for example, by running with a larger number of partitions than the default 64. However, today when bumping up the "ring_creation_size" config param to 256 or higher Riak started failing soon after startup with messages about "Too many open files". For the record, I'm using the ELevelDB back-end.

I've seen the documentation about the need for ring_creation_size * max_open_files file descriptors with levelDB. I've upped the system open files limit for the riak user to 100k, so I don't think I'm hitting that system limit. So it feels like I'm hitting a limit configured within the application somewhere.

It doesn't feel like changing levelDB's 'max_open_files' configuration is the issue here, as I'm using the default/minimum value of 20 for that parameter. Any other setting would increase open files.

So I could use a pointer here from folks who have been here. I suspect there is something very simple required here. 

Thanks folks!

Dave

ps. For the record, my data set is empty on this host, and for completeness I'm blowing away the ring state when I fiddle with the ring_creation_size parameter.

--
Dave Lowell
dave at connectv.com


2012-10-09 00:50:17.430 [info] <0.7.0> Application riak_kv started on node 'riak at 10.0.3.81'
2012-10-09 00:50:17.456 [info] <0.7.0> Application merge_index started on node 'riak at 10.0.3.81'
2012-10-09 00:50:17.459 [info] <0.1316.0>@riak_core:wait_for_service:445 Waiting for service riak_kv to start (0 seconds)
2012-10-09 00:50:17.525 [info] <0.1303.0>@riak_core:wait_for_application:419 Wait complete for application riak_kv (0 seconds)
2012-10-09 00:50:37.366 [error] <0.5081.0>@riak_kv_vnode:init:265 Failed to start riak_kv_eleveldb_backend Reason: {db_open,"IO error: /var/data/ctv/riak/leveldb/1427247692705959881058285969449495136382746624000/LOCK: Too many open files"}
2012-10-09 00:50:37.423 [notice] <0.5081.0>@riak:stop:46 "backend module failed to start."
2012-10-09 00:50:37.424 [error] <0.5081.0> CRASH REPORT Process <0.5081.0> with 0 neighbours exited with reason: {db_open,"IO error: /var/data/ctv/riak/leveldb/1427247692705959881058285969449495136382746624000/LOCK: Too many open files"} in gen_fsm:init_it/6 line 371
2012-10-09 00:50:37.429 [info] <0.494.0>@riak_kv_js_vm:terminate:240 Spidermonkey VM (pool: riak_kv_js_hook) host stopping (<0.494.0>)
2012-10-09 00:50:37.673 [error] <0.138.0> Supervisor riak_core_vnode_sup had child undefined started with {riak_core_vnode,start_link,undefined} at <0.5081.0> exit with reason {db_open,"IO error: /var/data/ctv/riak/leveldb/1427247692705959881058285969449495136382746624000/LOCK: Too many open files"} in context child_terminated
2012-10-09 00:50:37.736 [error] <0.153.0> gen_server riak_core_vnode_manager terminated with reason: no match of right hand value {error,{db_open,"IO error: /var/data/ctv/riak/leveldb/1427247692705959881058285969449495136382746624000/LOCK: Too many open files"}} in riak_core_vnode_manager:get_vnode/3 line 489
2012-10-09 00:50:37.799 [error] <0.153.0> CRASH REPORT Process riak_core_vnode_manager with 0 neighbours exited with reason: no match of right hand value {error,{db_open,"IO error: /var/data/ctv/riak/leveldb/1427247692705959881058285969449495136382746624000/LOCK: Too many open files"}} in riak_core_vnode_manager:get_vnode/3 line 489 in gen_server:terminate/6 line 747
2012-10-09 00:50:37.844 [error] <0.136.0> Supervisor riak_core_sup had child riak_core_vnode_manager started with riak_core_vnode_manager:start_link() at <0.153.0> exit with reason no match of right hand value {error,{db_open,"IO error: /var/data/ctv/riak/leveldb/1427247692705959881058285969449495136382746624000/LOCK: Too many open files"}} in riak_core_vnode_manager:get_vnode/3 line 489 in context child_terminated

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