smjn opened a new pull request, #19603:
URL: https://github.com/apache/kafka/pull/19603

   * Currently in the share group heartbeat flow, if we see a TP subscribed for 
the first time, we move that TP to initializing state in GC and let the GC send 
a persister request to share group initialize the aforementioned TP.
   * However, if the coordinator runtime request for share group heartbeat 
times out (maybe due to restarting/bad broker), the future completes 
exceptionally resulting in persiter request to not be sent.
   * Now, we are in a bad state since the TP is in initializing state in GC but 
not persister initialized. Future heartbeats for the same share partitions will 
also not help since we do not allow retrying persister request for initializing 
TPs.
   * This PR remedies the situation by allowing the same.
   * A temporary fix to increase offset commit timeouts in system tests was 
added to fix the issue. In this PR, we revert that change as well.


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