wcarlson5 commented on a change in pull request #9984:
URL: https://github.com/apache/kafka/pull/9984#discussion_r565734101



##########
File path: streams/src/main/java/org/apache/kafka/streams/KafkaStreams.java
##########
@@ -1005,11 +1036,28 @@ private StreamThread createAndAddStreamThread(final 
long cacheSizePerThread, fin
                             || threads.size() == 1)) {
                         streamThread.shutdown();
                         if 
(!streamThread.getName().equals(Thread.currentThread().getName())) {
-                            
streamThread.waitOnThreadState(StreamThread.State.DEAD);
+                            if 
(!streamThread.waitOnThreadState(StreamThread.State.DEAD, timeoutMs)) {
+                                log.warn("Thread " + streamThread.getName() + 
" did not stop in the allotted time");
+                                throw new TimeoutException("Thread " + 
streamThread.getName() + " did not stop in the allotted time");
+                            }
                         }
                         threads.remove(streamThread);
                         final long cacheSizePerThread = 
getCacheSizePerThread(threads.size());
                         resizeThreadCache(cacheSizePerThread);
+                        if (streamThread.getGroupInstanceID().isPresent()) {
+                            final MemberToRemove memberToRemove = new 
MemberToRemove(streamThread.getGroupInstanceID().get());
+                            final Collection<MemberToRemove> membersToRemove = 
Collections.singletonList(memberToRemove);
+                            final RemoveMembersFromConsumerGroupResult 
removeMembersFromConsumerGroupResult = 
adminClient.removeMembersFromConsumerGroup(config.getString(StreamsConfig.APPLICATION_ID_CONFIG),
 new RemoveMembersFromConsumerGroupOptions(membersToRemove));
+                            try {
+                                
removeMembersFromConsumerGroupResult.memberResult(memberToRemove).get(timeoutMs 
- begin, TimeUnit.MILLISECONDS);
+                            } catch (final 
java.util.concurrent.TimeoutException e) {

Review comment:
       We should. And I think maybe we should log the original stack trace




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