[jira] [Created] (KAFKA-12901) Metadata not updated after broker restart.

["Suriya Vijayaraghavan (Jira)" <ji...@apache.org>]

Suriya Vijayaraghavan created KAFKA-12901:
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             Summary: Metadata not updated after broker restart.
                 Key: KAFKA-12901
                 URL: https://issues.apache.org/jira/browse/KAFKA-12901
             Project: Kafka
          Issue Type: Bug
          Components: core
    Affects Versions: 2.8.0
            Reporter: Suriya Vijayaraghavan



We upgraded to version 2.8 from 2.7. After monitoring for few weeks we upgraded in our production setup (as we didn't enable Kraft we went ahead), we faced TimeoutException in our clients after few weeks in our production setup. We tried to list all active brokers using admin client API, all brokers were listed properly. So we logged into that broker and tried to do a describe topic with localhost as bootstrap-server, but we got timeout as there.

When checking the logs, we noticed a Shutdown print from kafka-shutdown-hook
thread (zookeeper session timed out and we had three retry failures). But the controlled shutdown got failed (got unknown server error response from the controller), and proceeded to unclean shutdown. Still the process didn't get quit but the process didnt process any other operation as well.  And this did not remove the broker from alive status for hours (able to see this broker in list of brokers) and our clients were still trying to contact this broker and failing with timeout exception. So we tried restarting the problematic broker, but we faced unknown topic or partition issue in our client after the restart. We noticed that metadata was not loaded. So we had to restart our controller. And after restarting the controller everthing got back to normal.

So how metadata loading is handled? Is there any alternative ways for us to automate monitoring for metadata update? 




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