pivotal-eshu commented on a change in pull request #6659:
URL: https://github.com/apache/geode/pull/6659#discussion_r664771209



##########
File path: 
geode-core/src/main/java/org/apache/geode/internal/cache/TXLastEventInTransactionUtils.java
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@@ -77,11 +78,7 @@ private static boolean 
checkNoSendersGroupTransactionEvents(List<EntryEventImpl>
       Cache cache) throws ServiceConfigurationError {
     for (String senderId : getSenderIdsForEvents(callbacks)) {
       GatewaySender sender = cache.getGatewaySender(senderId);
-      if (sender == null) {
-        logger.error("No sender found for {}", senderId);
-        throw new ServiceConfigurationError("No information for senderId: " + 
senderId);
-      }
-      if (sender.mustGroupTransactionEvents()) {
+      if (sender != null && sender.mustGroupTransactionEvents()) {

Review comment:
       In the flow of the code to getLastTransactionEvent, 
checkNoSendersGroupTransactionEvents was executed before 
doesSenderGroupTransactionEvents.
   
   Method checkNoSendersGroupTransactionEvents returns false if there is one op 
needs to send to a GatewaySender which has mustGroupTransactionEvents set to 
true. Otherwise doesSenderGroupTransactionEvents method won't be executed 
(getLastTransactionEvent returns null in that case).
   
   If in a tx, there is one op needs to send to gateway with 
mustGroupTransactionEvents setting, all ops in the transaction should as well. 
If not, it means user did not configure the senders correctly (for the 
transaction executed). 




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