bschuchardt commented on a change in pull request #6037:
URL: https://github.com/apache/geode/pull/6037#discussion_r582349975



##########
File path: 
geode-membership/src/main/java/org/apache/geode/distributed/internal/membership/gms/GMSMembership.java
##########
@@ -1231,23 +1197,16 @@ public void shutdownMessageReceived(ID id, String 
reason) {
     if (logger.isDebugEnabled()) {
       logger.debug("Membership: recording shutdown status of {}", id);
     }
-    synchronized (this.shutdownMembers) {
-      this.shutdownMembers.put(id, id);
-      services.getHealthMonitor()
-          .memberShutdown(id, reason);
-      services.getJoinLeave().memberShutdown(id, reason);
-    }
+    this.shutdownMembers.add(id);
+    services.getJoinLeave().memberShutdown(id, reason);
   }
 
   @Override
   public Set<ID> getMembersNotShuttingDown() {
-    latestViewReadLock.lock();
-    try {
-      return latestView.getMembers().stream().filter(id -> 
!shutdownMembers.containsKey(id))
+    synchronized (shutdownMembers) {

Review comment:
       @pivotal-jbarrett yes, we've always created a new collection like this 
for the reply processors.  This code now seems to create two (if you look at 
its primary use in ClusterDistributionManager) so that could be made more 
efficient.




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