AndrewJSchofield commented on code in PR #17739:
URL: https://github.com/apache/kafka/pull/17739#discussion_r1835733808


##########
core/src/main/java/kafka/server/share/DelayedShareFetch.java:
##########
@@ -90,14 +90,17 @@ public void onExpiration() {
      */
     @Override
     public void onComplete() {
+        // We are utilizing lock so that onComplete doesn't do a dirty read 
for global variables -
+        // partitionsAcquired and partitionsAlreadyFetched, since these 
variables can get updated in a different tryComplete thread.
+        lock.lock();
         log.trace("Completing the delayed share fetch request for group {}, 
member {}, "
             + "topic partitions {}", shareFetchData.groupId(), 
shareFetchData.memberId(),
             partitionsAcquired.keySet());
 
         if (shareFetchData.future().isDone())
             return;

Review Comment:
   Hmm. Isn't this a return without unlocking? Seems wrong. I wonder if you 
should rearrange the code here so there's a try-finally and it's not possible 
to exit the method without unlocking.



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