[rabbitmq-discuss] File Description Exhaustion with Transient Messages

[Chris Larsen]

Hello again, We had a 3.1.5 node exhaust the 65K FDs allocated to MQ and I'm
wondering what consumes and holds the FDs. I know from the list that each
connection will eat an FD and each queue will consume one or more
descriptors. However at the time of the alarm we only had 8K connections and
5K queues.  That wouldn't account for 65K FDs though. 

 

Lsof shows that there are of 50K handles consumed with references to the
transient message store, e.g. "msg_store_transient/352.rdq". There are about
30M messages queued up and the devs said that most of them are marked for
persistence now (only about 2K unacked). Are these messages responsible for
holding open so many FDs? There isn't any memory or disk space pressure (7GB
of 32GB memory used).  Would disabling acknowledgements help to reduce the
FD usage?

 

Thank you!

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