Bill commented on a change in pull request #6037:
URL: https://github.com/apache/geode/pull/6037#discussion_r580637810



##########
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);

Review comment:
       My bigger concern in this version of this method is the lack of 
synchronization around `shutdownMembers.add(id)` since that collection is not 
thread-safe.
   
   @pivotal-jbarrett I believe @kamilla1201 has a new commit coming to fix CI…




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