chirag-wadhwa5 opened a new pull request, #20280:
URL: https://github.com/apache/kafka/pull/20280

   In the current implementation, some delayed share fetch operations get 
trapped in the delayed share fetch purgatory when the partition leaderships 
change during share consumption. This is because there is no check in code to 
make sure the current broker is still the partition leader corresponding to the 
share partitions. So, when leadership changes, the share partitions cannot be 
acquired, because they have already been fenced, and tryComplete returns false. 
Although the operatio does get completed when the timer expires for it, but it 
is too late by then, and the operation get stuck in the watchers list waiting 
for it to get purged when estimated operations increase to more than 1000. This 
Pr resolves this by adding the required check so that if partition leadership 
changes, then the delayed share fetches waiting on it gets completed 
instantaneously.


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