[jira] [Created] (KAFKA-14280) quorum election random backoff always return 0 for 1st timeout

["Luke Chen (Jira)" <ji...@apache.org>]

Luke Chen created KAFKA-14280:
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             Summary: quorum election random backoff always return 0 for 1st timeout
                 Key: KAFKA-14280
                 URL: https://issues.apache.org/jira/browse/KAFKA-14280
             Project: Kafka
          Issue Type: Bug
          Components: kraft
    Affects Versions: 3.3.1
            Reporter: Luke Chen
            Assignee: Luke Chen


When doing quorum election, we added a random election backoff if vote got rejected or timeout, and hope next round, there will be no conflict between different voters. But we currently, we calculate the random backoff by:

 
{code:java}
Math.min(RETRY_BACKOFF_BASE_MS * random.nextInt(2 << Math.min(20, retries - 1)),
        raftConfig.electionBackoffMaxMs());{code}
 

That means, when multiple candidates tried to backoff for the 1st retries, they will all get 0ms backoff, and then keep conflicting again.

 



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