Unfortunately, Riak 2.9.0 was released with an issue whereby a race condition in heavy-PUT scenarios (e.g. handoffs), could cause a leak of file descriptors.
The issue is described here - https://github.com/basho/riak_kv/issues/1699, and the underlying issue here - https://github.com/martinsumner/leveled/issues/278. There is a new patched version of the release available (2.9.0p1) at https://github.com/basho/riak/tree/riak-2.9.0p1. This should be used in preference to the original release of 2.9.0. Updated packages are available (thanks to Nick Adams at TI Tokyo) - https://files.tiot.jp/riak/kv/2.9/2.9.0p1/ Thanks also to the testing team at the NHS Spine project, Aaron Gibbon (BJSS) and Ramen Sen, who discovered the problem. Regards Martin
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