messages are no longer retained with 2.0.16+ (with a lot of reained topics?)

Since upgrading to mosquitto 2.0.16 (and later 2.0.17) (via docker image) retained messages received by the broker are no longer handled as retained and not delivered to new subscribers.

Downgrading to 2.0.15 makes this work as expected again.

(Happy to add more details about our setup if required)

I tried to repliciate the problem in a test setup including another mosquitto as an mqtt brigde but so far was unable to replicate the problem. Will keep you updated.

[stigvi]

Downgrading to 2.0.15 makes this work as expected again.

Yes, I did the same after a lot of troubles with no retained messages with 2.0.17

@stigvi Good to know we are at least not alone with this problem. Did you find a way to reproduce this problem somehow?

[pat1]

duplicated of #2806 and #2618

[pat1]

related to #2785

@pat1

duplicated of #2806 and #2618

I'm not sure it is? We do not experience this problem here with 2.0.15, which is explicitly mentioned in the other issue(s) as affected.

[ralight]

@BubuOT I've been unable to reproduce this so far. Are you able to share any more details about the setup and what sorts of topics you are using?

[clintkev251]

I've also seen this. Specifically I'm using mosquitto with Home Assistant and Zigbee2MQTT in this case. Previously, when Home Assistant was restarted, it would read device configurations set as retained messages from Zigbee2MQTT automatically. However on 2.0.17, it would seemingly never be able to receive these retained messages and as a result devices remained unavailable until a restart of Zigbee2MQTT to force it to republish all of the discovery topics at which point they would be successfully received by Home Assistant

I confirmed that rolling back to 2.0.15, this began working as expected again. Let me know if there's any other information that would be helpful in reproducing

@ralight I have so far also been unable to reproduce this outside our production environment :-/

Here's our mosquitto config though:

# A full description of the configuration file is at
# /usr/share/doc/mosquitto/examples/mosquitto.conf.example

# >> AUTHENTICATION

# clients must authenticate
#allow_anonymous false
#password_file /mosquitto/config/passwd

# access control list
acl_file /mosquitto/config/acl

# >> PERSISTANCE

# save in-memory database for persistance to disk
autosave_interval 60

# write persistance data to the disk instead of storing only in memory
persistence true
persistence_location /mosquitto/data/

# >> LOGGING

# include timestamp
log_timestamp true

# Possible types are: debug, error, warning, notice, information, subscribe, unsubscribe, websockets, none, all.
#log_type all
#log_type debug
log_type error
log_type warning
#log_type notice
#log_type information
#log_type subscribe
#log_type unsubscribe

# If set to true, the log will include entries when clients connect and disconnect.
connection_messages true

# >> LISTENER

# plain mqtt protocol
# bind to 1883 public since security access is handled
# through docker container isolation
listener 1883
require_certificate true
use_identity_as_username true
use_username_as_clientid true
certfile /mosquitto/config/mqtt.othermo.de.crt
cafile /mosquitto/config/ca.crt
keyfile /mosquitto/config/mqtt.othermo.de.key
# use CRL to prevent revoked clients to access
crlfile /mosquitto/config/crl.pem

# encrypted listener on 8883
listener 8883
require_certificate true
use_identity_as_username true
use_username_as_clientid true
certfile /mosquitto/config/mqtt.othermo.de.crt
cafile /mosquitto/config/ca.crt
keyfile /mosquitto/config/mqtt.othermo.de.key
# use CRL to prevent revoked clients to access
crlfile /mosquitto/config/crl.pem

The bridge config (not sure if relevant.) looks like this:

connection_messages false
connection upstream
address <DOMAIN>

bridge_protocol_version mqttv311
bridge_insecure false
bridge_cafile <filename>
bridge_certfile <filename>
bridge_keyfile<filename>

notifications true

notification_topic {DEVICEID}/status
<list of bridged topics; mix between in an out and qos 0 and 1>
remote_clientid {DEVICEID}

[ralight]

Ok, thank you. I will keep looking, and if you find a way to reproduce it please let me know.

[simonclayton]

We have this exact issue when upgrading mosquitto 2.0.15 to 2.0.18 on docker. I can replicate the issue with data "missing" on 2.0.16, 2.0.17 and 2.0.18 but switching back to the 2.0.15 docker image just by editing the docker-compose.yml file and restarting immediately "fixes" everything without needing to republish any data.

In case it helps, we only start to see the issue with increasing volumes of data. We have 2 top level topics with a number of nested topics and at ~30k topics published on 2.0.15 or 2.0.18, connecting with MQTT Explorer shows ~1400 topics as the complete data set.

Testing with only one top level topic with ~1100 subtopics, we get all of the data sent to the client correctly. It is only when we add a 2nd top level topic with ~28k subtopics that we start to see issues.

For reference - our topic structure looks like this

--- topic1 (~1100 subtopics in total)
 |       |- sub1
 |       |     |- sub-subtopics1..10
 |       |     |                |- data topics
 |       | 
 |       |- sub2
 |       |     |- sub-subtopics1..2
 |       |     |                |- data topics
 |       | 
 |- topic2 (~28k subtopics in total)
 |       |- sub1
 |       |     |- sub-subtopics1..10
 |       |     |                |- data topics
 |       | 
 |       |- sub2
 |       |     |- sub-subtopics1..2
 |       |     |                |- data topics

I have a test server that only has dockerized mosquitto on and no personal data that I can let a project dev have root access to if you want to see this happening.

FWIW, we also have a lot of retained topics (~10k) in production where we saw this issue. This might explain why I've never been able to reproduce this in any test setup 🤔.

[ZetaWaves]

I am having the same issue. All devices come up as "Unavailable" on Home Assistant after an HA reboot.
Is this being worked on? This is a critical bug as my entire network is down with no fix.

[clintkev251]

Well you can temporarily fix it very easily by reverting to 2.0.15 where retained topics are working as expected

[ZetaWaves]

Well you can temporarily fix it very easily by reverting to 2.0.15 where retained topics are working as expected

Not possible. I’m using MQTT HA Addon. No way to go back in version unfortunately.