boglesby commented on a change in pull request #7416:
URL: https://github.com/apache/geode/pull/7416#discussion_r821946159



##########
File path: 
geode-core/src/main/java/org/apache/geode/internal/cache/tier/sockets/MessageDispatcher.java
##########
@@ -432,34 +443,32 @@ protected void runDispatcher() {
           _messageQueue.remove();
           clientMessage = null;
         } catch (AuthenticationExpiredException expired) {
-          if (waitForReAuthenticationStartTime == -1) {
-            waitForReAuthenticationStartTime = System.currentTimeMillis();
-            // only send the message to clients who can handle the message
-            if 
(getProxy().getVersion().isNewerThanOrEqualTo(RE_AUTHENTICATION_START_VERSION)) 
{
-              EventID eventId = createEventId();
-              sendMessageDirectly(new ClientReAuthenticateMessage(eventId));
-            }
-            // We wait for all versions of clients to re-authenticate. For 
older clients we still
-            // wait, just in case client will perform some operations to
-            // trigger credential refresh on its own.
-            Thread.sleep(200);
-          } else {
+          waitForReAuthenticationStartTime = System.currentTimeMillis();
+          // only send the message to clients who can handle the message
+          if 
(getProxy().getVersion().isNewerThanOrEqualTo(RE_AUTHENTICATION_START_VERSION)) 
{
+            EventID eventId = createEventId();
+            sendMessageDirectly(new ClientReAuthenticateMessage(eventId));
+          }
+          // We wait for all versions of clients to re-authenticate. For older 
clients we still
+          // wait, just in case client will perform some operations to
+          // trigger credential refresh on its own.
+          synchronized (re_auth_lock) {

Review comment:
       I'm not sure. I was just thinking if a GC occurs after the message has 
been sent but before the wait occurs, it might miss it. I guess the GC would 
also cause the PutUserCredentials message from the client to not be processed 
either. So, I guess this is a non-issue.




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