Attempting to call unbound fn: #'hugsql.expr-run/expr--51710943

[dealy663-zz]

Hi

I've been struggling with trying to prevent this type of exception for several days now. There must be some aspect of the binding of sql functions that I'm misunderstanding.

Early on in the startup of my application (on the main thread) my sql files are read by hugsql. Later I startup several threads which need to interact with the DB. There are always several hugsql functions that are successfully called on these threads. But then a little while later (milliseconds) I will get an unbound fn error. Its not always the same function and sometimes my app starts with no problem and no unbound function errors.

When the unbound fn error happens it is only within the first second or two of operation, afterwards it never happens again. The worker threads don't start until after the function which calls the map-of-db-fns on all of my sql files has returned.

I assume it is hugsql that is outputting this error.

Any ideas what might be going wrong here?

[csummers]

@dealy663 This is strange. Do you have any code that is wiping out namespaces in order to reload them?

Also, this may be tangentially related to issue #46 and the un-threadsafe nature of Clojure's require.

[amoe]

FWIW I also see this problem occasionally. I use the Rook routing library, which does some magic regarding namespaces, so I've presumed so far that it's some interaction between the two of those. My problem also only happens once, shortly after start up of the JVM, and disappears thereafter.

[tdavis]

I see this as well when running a function that uses HugSQL functions via pmap.

[csummers]

2c61459 should fix this. It at least passes the test from pull request #80.

My solution is to define expressions in an atom, and then Thread/sleep (oof!) until the definition is there. There should be no sleeping for the common case of a single thread loading up a namespace.

[csummers]

Released in version 0.4.9