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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/04/09 10:33:00 UTC
[jira] [Work logged] (BEAM-9647) No MQTT connection possible
because clientId is too long
[ https://issues.apache.org/jira/browse/BEAM-9647?focusedWorklogId=419326&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-419326 ]
ASF GitHub Bot logged work on BEAM-9647:
----------------------------------------
Author: ASF GitHub Bot
Created on: 09/Apr/20 10:32
Start Date: 09/Apr/20 10:32
Worklog Time Spent: 10m
Work Description: mjacoby commented on pull request #11361: [BEAM-9647] fixes MQTT clientId to long
URL: https://github.com/apache/beam/pull/11361
Restricts MQTT clientIds to be at most 23 characters which is required by the standard.
R: @iemejia
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 419326)
Remaining Estimate: 0h
Time Spent: 10m
> No MQTT connection possible because clientId is too long
> --------------------------------------------------------
>
> Key: BEAM-9647
> URL: https://issues.apache.org/jira/browse/BEAM-9647
> Project: Beam
> Issue Type: Bug
> Components: io-java-mqtt
> Affects Versions: 2.19.0
> Reporter: Michael Jacoby
> Priority: Critical
> Time Spent: 10m
> Remaining Estimate: 0h
>
> The used FuseSource MQTT library only supports (outdated) MQTT version 3.1. According to MQTT v3.1 protocol ([https://public.dhe.ibm.com/software/dw/webservices/ws-mqtt/mqtt-v3r1.html#connect]) a clientId must be <= 23 characters, otherwise the connection must be rejected by the server. However, in MqttIO ([https://github.com/apache/beam/blob/master/sdks/java/io/mqtt/src/main/java/org/apache/beam/sdk/io/mqtt/MqttIO.java#L223]) the clientId is always appended with a random UUID which itself is longer than 23 characters. This implies that establishing a connection this way should never work.
> FYI: If you don't encounter this error when testing it may be because some servers do not correctly implement the standard and accept connections with a clientId longer than 23 characters (e.g. HiveMQ) or crash and/or don't respond to such connection requests at all.
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