I have a long-running racket server that’s connecting to a MySQL back end. It
has a connection pool wrapped in a virtual connection, created like this:
;; create a connection to the database
(define conn
(virtual-connection
(connection-pool
(lambda ()
(mysql-connect #:database "sodec2"
#:user "clements"
#:password “redacted"
#:socket mysql-socket)))))
When this server is running, it periodically produces errors of this form:
connection-pool-lease: connection-pool-limit reached
My reading of the documentation is that the “default” connection pool limit is
+inf.0, which suggests that I shouldn’t be getting this error.
Is this a bug?
Ah, what the heck, lemme ask about my other problem. I’m running this process
with everything at or above ‘warning’ level redirected to syslog, and I’m a
whole lot of these:
System Events
=-=-=-=-=-=-=
Apr 25 09:02:45 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:02:45 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:02:45 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:02:45 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:02:46 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:02:46 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:03:45 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:03:45 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:03:50 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:03:50 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:03:50 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:03:50 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:03:50 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:04:49 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:04:50 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:04:50 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:04:50 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:04:50 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:04:50 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:05:50 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:05:50 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:05:50 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:05:50 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:05:50 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:05:50 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:06:50 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:06:54 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:06:54 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:06:54 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:06:54 linode racket: epoll error at remove: Bad file descriptor;
errno=9
Apr 25 09:06:54 linode racket: epoll error at remove: Bad file descriptor;
errno=9
….
This continues for sometimes hours at a time. I just spent five minutes reading
the epoll documentation, and it sounds like … maybe a select() on a fd that’s
already closed?
John
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