schema-reader: Shutdown service if corrupt entries in _schemas topic
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Previously, when we encounter errors within the `_schemas` topic, we would continue the message loading and skip the problematic schema. This is not ideal as it might leave the application with corrupt schema data and the side-effects could be grave. What we do now is to kill the service, log the errors and allow a graceful shutdown. We will follow this work by adding metrics for such cases.
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This was referenced Aug 29, 2024
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We'd like to allow the shutdown logic on corrutp schema be guarded by a feature flag so we do not surprise customers, this is disabled by default.
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About this change - What it does
These breaking changes are guarded by environmental variables
These can be toggled by the various users, the default values are shown below:
The logic below only applies when
KARAPACE_KAFKA_SCHEMA_READER_STRICT_MODEis set totrue, everything else remains the same, thus no test changes.Previously, when we encounter errors within the
_schemastopic, we would continue the message loading and skip the problematic schema. This is not ideal as it might leave the application with corrupt schema data and the side-effects could be grave.What we do now is to kill the service, log the errors and allow a graceful shutdown. We will follow this work by adding metrics for such cases.
This will also stop the service post backup-v1 restore if there are any corrupt schemas present in the backup log file
We can see below that the shutdown is graceful:
Adding
restart: alwaysto docker compose shows the behaviour, the service never proceeds past that stage, i think based on the restart behaviour forsystemd, we might need to rely on the alerts and then intervene otherwise it'd leave the service in a crash loop, we need to verify if there are SLOs or metrics setup somewhere to track at least service uptime, which will be affected by this.