adixitconfluent commented on code in PR #17739:
URL: https://github.com/apache/kafka/pull/17739#discussion_r1845190860


##########
core/src/main/java/kafka/server/share/DelayedShareFetch.java:
##########
@@ -90,39 +90,50 @@ 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;
+        try {
+            if (shareFetchData.future().isDone())
+                return;

Review Comment:
   sure, I'll cover it as part of JIRA 
https://issues.apache.org/jira/browse/KAFKA-18027 in the near future..



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