[jira] [Updated] (CAMEL-19285) Kafka consumer can flood brokers if TLS handshake fails and pollOnError is set to RECONNECT

["Claus Ibsen (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CAMEL-19285?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Claus Ibsen updated CAMEL-19285:
--------------------------------
    Fix Version/s: 3.20.7
                       (was: 3.20.6)

> Kafka consumer can flood brokers if TLS handshake fails and pollOnError is set to RECONNECT
> -------------------------------------------------------------------------------------------
>
>                 Key: CAMEL-19285
>                 URL: https://issues.apache.org/jira/browse/CAMEL-19285
>             Project: Camel
>          Issue Type: Bug
>          Components: camel-kafka
>    Affects Versions: 3.20.2, 3.20.3
>            Reporter: Dylan Piergies
>            Priority: Major
>             Fix For: 3.20.7, 3.21.0, 4.0
>
>
> The Kafka consumer does not respect reconnect backoff options when a TLS handshake fails if the consumer's {{pollOnError}} option is set to {{{}RECONNECT{}}}, resulting in reconnection attempts being made in a tight loop without delays, meaning that Camel applications consuming from Kafka topics can effectively mount a DDoS attack on the Kafka broker. This effect is amplified if concurrent consumers are in use, since each consumer thread is making its own connection attempts.
> Naturally, we found this out the hard way, in production, when another team put in place a firewall rule to allow connections from our consumers. The amount of TLS handshake traffic generated was sufficient to overwhelm the broker, resulting in an outage.
> I have created a small project to demonstrate the issue against a containerised Kafka broker here: [https://github.com/dylanpiergies/kafka-camel-flood-issue]
> This issue does not occur when a connection fails for other reasons (e.g. connection refused, connection timeout); in these cases the reconnect backoff behaves as expected.



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