Apache Drill and MongoDB: IllegalStateException

If you are using Apache Drill as frontend for access to a MongoDB instance, you may get this error after more than 24 hours of uptime.

Apparently, this is related to a connection cache that expires at some point and is not reset. In this case, restarting the drillbit solves the problem. Once the patch from 21/07/15 is part of the build, this should not happen any more.

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