Latest working celery/redis cannot inspect: Error: No nodes replied within time constraint.

• I have read the relevant section in the contribution guide on reporting bugs.
• I have checked the issues list for similar or identical bug reports.
• I have checked the pull requests list for existing proposed fixes.
• I have checked the commit log to find out if the bug was already fixed in the master branch.
• I have included all related issues and possible duplicate issues in this issue (If there are none, check this box anyway).

Mandatory Debugging Information

• I have included the output of celery -A proj report in the issue. (if you are not able to do this, then at least specify the Celery version affected).
• I have verified that the issue exists against the master branch of Celery.
• I have included the contents of pip freeze in the issue.
• I have included all the versions of all the external dependencies required to reproduce this bug.

Related Issues

• https://github.com/celery/celery/issues/1456
• https://github.com/celery/celery/issues/4688
• https://github.com/celery/celery/issues/3453

Possible Duplicates

• None

Environment & Settings

Celery version: 4.3.0

celery report Output:

software -> celery:4.3.0 (rhubarb) kombu:4.6.4 py:2.7.16
            billiard:3.6.1.0 redis:3.2.1
platform -> system:Linux arch:64bit
            kernel version:3.10.0-957.27.2.el7.x86_64 imp:CPython
loader   -> celery.loaders.app.AppLoader
settings -> transport:sentinel results:disabled

CELERY_QUEUES:
    (<unbound Queue celery -> <unbound Exchange celery(direct)> -> celery>,
 <unbound Queue fast -> <unbound Exchange fast(direct)> -> fast>,
 <unbound Queue slow -> <unbound Exchange slow(direct)> -> slow>,
 <unbound Queue mp-fast -> <unbound Exchange mp-fast(direct)> -> mp-fast>,
 <unbound Queue mp-slow -> <unbound Exchange mp-slow(direct)> -> mp-slow>)
BROKER_TRANSPORT_OPTIONS: {
    'master_name': 'staging'}
BROKER_URL: u'sentinel://redis-s1.example.domain.com:26379//'
CELERY_ALWAYS_EAGER: False
CELERY_DISABLE_RATE_LIMITS: True
CELERY_ACCEPT_CONTENT: ['json']
CELERYD_MAX_TASKS_PER_CHILD: 2000
CELERY_IMPORTS:
    ('tasks',)
CELERY_EAGER_PROPAGATES_EXCEPTIONS: True
CELERY_STORE_ERRORS_EVEN_IF_IGNORED: True
CELERY_IGNORE_RESULT: True
CELERY_TASK_SERIALIZER: 'json'

Steps to Reproduce

Required Dependencies

• Minimal Python Version: 2.7.16
• Minimal Celery Version: 4.3.0
• Minimal Kombu Version: 4.6.4
• Minimal Broker Version: redis 3.0.6
• Minimal Result Backend Version: N/A or Unknown
• Minimal OS and/or Kernel Version: N/A or Unknown
• Minimal Broker Client Version: N/A or Unknown
• Minimal Result Backend Client Version: N/A or Unknown

Python Packages

pip freeze Output:

ABN==0.4.2
address==0.1.1
akismet==1.0.1
amqp==2.5.1
asn1crypto==0.24.0
attrs==19.1.0
Authlib==0.11
Authomatic==0.0.13
awesome-slugify==1.6.2
Babel==2.6.0
backports.functools-lru-cache==1.5
billiard==3.6.1.0
bleach==1.5.0
boto==2.38.0
cachetools==3.1.1
cas-client==1.0.0
celery==4.3.0
certifi==2017.7.27.1
cffi==1.12.3
chardet==3.0.4
click==6.7
configparser==3.8.1
contextlib2==0.5.5
coverage==4.5.4
cryptography==2.0.3
cssselect==0.9.2
cycler==0.10.0
datadog==0.11.0
ddtrace==0.25.0
decorator==4.4.0
dnspython==1.16.0
docopt==0.4.0
docutils==0.15.2
elasticsearch==6.3.1
enum34==1.1.6
filelock==3.0.12
funcsigs==1.0.2
future==0.17.1
google-auth==1.6.2
hiredis==0.2.0
html5lib==0.9999999
httplib2==0.13.1
idna==2.8
importlib-metadata==0.19
ipaddress==1.0.22
isodate==0.5.4
itsdangerous==0.24
Jinja2==2.7.1
kafka-python==1.4.6
kiwisolver==1.1.0
kombu==4.6.4
lmtpd==6.0.0
lockfile==0.12.2
loginpass==0.2.1
lxml==3.6.1
mandrill==1.0.57
Markdown==2.2.1
MarkupSafe==0.18
matplotlib==2.2.4
mock==1.0.1
more-itertools==5.0.0
mysqlclient==1.3.9
netaddr==0.7.19
numpy==1.16.4
oauth2==1.9.0.post1
packaging==19.1
passlib==1.6.1
pathlib2==2.3.4
paypalrestsdk==0.6.2
Pillow==2.8.1
pluggy==0.6.0
psutil==5.6.3
py==1.8.0
pyasn1==0.4.6
pyasn1-modules==0.2.6
PyBabel-json==0.2.0
pybreaker==0.5.0
pycountry==18.2.23
pycparser==2.19
pycryptodome==3.8.2
PyJWT==0.4.1
pylibmc==1.6.0
pyparsing==2.4.2
pytest==3.5.0
pytest-cov==2.4.0
python-daemon==2.1.2
python-dateutil==2.1
pytz==2014.4
PyYAML==3.12
raven==5.31.0
redis==3.2.1
regex==2018.11.3
requests==2.7.0
rsa==4.0
salmon-mail==3.0.0
scandir==1.10.0
simple-db-migrate==3.0.0
simplejson==3.10.0
six==1.11.0
SQLAlchemy==1.0.6
subprocess32==3.5.4
sudz==1.0.3
termcolor==1.1.0
toml==0.10.0
tox==3.13.2
Unidecode==0.4.21
urllib3==1.25.3
uWSGI==2.0.17.1
vine==1.3.0
virtualenv==16.7.2
Werkzeug==0.11.15
WTForms==1.0.5
zipp==0.5.2

Other Dependencies

N/A

Minimally Reproducible Test Case

Expected Behavior

I expect celery -A app inspect ping (as well as other subcommands of celery inspect) to return output.

Actual Behavior

This configuration and version of celery/redis/sentinel has been working fine until just recently and I’m not sure what might have changed. I’m guessing it might have something to do with conflicting packages (given how many there are in this python env 👀 ) but I’m not sure what else to check. I can verify by looking at the keys in redis and also by using tcpdump that celery is definitely able to reach the redis servers using the sentinel brokers. The deployment of celery is also serving tasks and otherwise seems to be working normally. I can’t though for some reason run any of the inspect like commands without getting Error: No nodes replied within time constraint.

The only thing I see in the debug logs is again proof that the celery workers are getting the message, but still nothing comes back:

[2019-08-20 16:34:23,472: DEBUG/MainProcess] pidbox received method ping() [reply_to:{'routing_key': 'dbc97d66-fe94-3d6d-aa6a-bb965893ae2b', 'exchange': 'reply.celery.pidbox'} ticket:19949cbb-6bf0-4b36-89f7-d5851c0bddd0]

We also captured redis traffic using MONITOR and we can see that pings are being keyed and populated: https://gist.github.com/jslusher/3b24f7676c93f90cc55e1330f6e595d8

[AbrahamLopez10]

Was having this issue as well with kombu 4.6.4, downgraded it to version 4.6.3 and it now works.

[auvipy]

yes 4.6.5 is underway with celery 4.4.0rc4 / final