"Operation now in progress" error on delete

[ablis...@fusionbox.com]

Hi,

We are frequently getting the error "operation now in progress" when attempting to delete keys from memcached, but I can find little documentation about how to resolve them. Can anyone provide any suggestions as to what to investigate to attempt to solve this issue?

Thanks,

Alex

[dormando]

That's not a protocol error. What client/language/etc are you using?

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[Alex Bliskovsky]

I'm using Python 3.4, Django 1.11 and Django's version of PyLibMC.

Alexander Bliskovsky, Software Engineer
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[dormando]

Well I don't know what that is offhand. Not much of a python user myself

Some quick googling shows it's likely a timeout:
https://github.com/lericson/pylibmc/issues/89 - there's nothing about
deletes that would cause that specifically, so it might be happening all
the time. Or you're calling deletes on the wrong object, batching them too
much, causing protocol desync with bad keys (spaces/newlines)

hopefully someone else has something more insightful to say.