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Unhandled Exception in Connection Loop: RuntimeError: ('xids do not match, expected %r received %r', 28, 27)

See original GitHub issue

Two days ago we upgraded our servers from Kazoo 1.3.1 -> Kazoo 2.0. We started seeing a 10x increase in the number of connection failures … and the recovery of those connections is far worse too. It looks like we’re seeing a new exception being raised that we did not see before.

        "stack_trace": [
            "Traceback (most recent call last):", 
            "  File '/mnt/.venv/lib/python2.7/site-packages/kazoo/protocol/connection.py', line 531, in _connect_attempt", 
            "    response = self._read_socket(read_timeout)", 
            "  File '/mnt/.venv/lib/python2.7/site-packages/kazoo/protocol/connection.py', line 407, in _read_socket", 
            "    return self._read_response(header, buffer, offset)", 
            "  File '/mnt/.venv/lib/python2.7/site-packages/kazoo/protocol/connection.py', line 338, in _read_response", 
            "    'received %r', xid, header.xid)", 
            "RuntimeError: ('xids do not match, expected %r received %r', 28, 27)"

This is being caught by kazoo.client and throwing the Unhandled exception in connection loop error. I’m completely stumped, I can’t seem to replicate this in my own dev environment… and it only happens sporadically in production.

Issue Analytics

State:
Created 9 years ago
Comments:6 (6 by maintainers)

Top GitHub Comments

1reaction

rgs1commented, Nov 24, 2014

@diranged curious, are you using authentication? (i.e.: add_auth calls). The reason I ask is because of https://github.com/python-zk/kazoo/commit/15b7632fba6cbb2f31bda95eb4ca4ad327c04919. Not sure if related.

Also, what’s running on your servers? I do see this is from time to time on 3.5 (i.e.: ZK out of trunk from a couple of months ago + patches).

0reactions

jeffwidmancommented, Jul 24, 2017

bump @diranged any updates per above?

Is it still reproducible?

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