Public bug reported:
My juju cluster had some connection issues to zookeeper. While I was
reading the charm.log of my jenkins-slave unit I noticed that juju had
logged many thousands of exceptions such as this one:
2012-11-09 06:51:07,514: twisted@ERROR: Traceback (most recent call last):
2012-11-09 06:51:07,514: twisted@ERROR: File
"/usr/lib/python2.7/dist-packages/txzookeeper/managed.py", line 319, in
_cb_created
2012-11-09 06:51:07,514: twisted@ERROR: if self._check_result(result_code,
d):
2012-11-09 06:51:07,514: twisted@ERROR: File
"/usr/lib/python2.7/dist-packages/txzookeeper/client.py", line 219, in
_check_result
2012-11-09 06:51:07,514: twisted@ERROR: self, error)
2012-11-09 06:51:07,515: twisted@ERROR: File
"/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 134, in
maybeDeferred
2012-11-09 06:51:07,515: twisted@ERROR: result = f(*args, **kw)
2012-11-09 06:51:07,515: twisted@ERROR: File
"/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1181, in
unwindGenerator
2012-11-09 06:51:07,515: twisted@ERROR: return _inlineCallbacks(None, gen,
Deferred())
2012-11-09 06:51:07,516: twisted@ERROR: --- <exception caught here> ---
2012-11-09 06:51:07,516: twisted@ERROR: File
"/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1039, in
_inlineCallbacks
2012-11-09 06:51:07,516: twisted@ERROR: result = g.send(result)
2012-11-09 06:51:07,516: twisted@ERROR: File
"/usr/lib/python2.7/dist-packages/txzookeeper/managed.py", line 257, in
_cb_connection_error
2012-11-09 06:51:07,517: twisted@ERROR: raise error
2012-11-09 06:51:07,517: twisted@ERROR: zookeeper.ConnectionLossException:
connection loss
I can see about 300 such exceptions _every second_. This is very bad on two
levels:
1) It quickly fills the log with pointless exceptions, using disk space,
saturating slow virtual IO
2) It is against proven network practice of using exponential backoff when
retrying failed communication
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: juju 0.5+bzr531-0ubuntu1.3
ProcVersionSignature: User Name 3.2.0-32.51-virtual 3.2.30
Uname: Linux 3.2.0-32-virtual x86_64
ApportVersion: 2.0.1-0ubuntu14
Architecture: amd64
Date: Tue Nov 13 09:26:31 2012
Ec2AMI: ami-000000bf
Ec2AMIManifest: FIXME
Ec2AvailabilityZone: nova
Ec2InstanceType: m1.small
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
PackageArchitecture: all
ProcEnviron:
TERM=xterm-256color
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: juju
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: juju (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug ec2-images precise
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https://bugs.launchpad.net/bugs/1078217
Title:
zookeeper connection is not using exponential backoff
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