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• Code will be added at the end of the current stop gateway sender gfsh command which will set mustQueueDroppedEvents to false (after the gateway senders have been stopped).
• Code will be added at the beginning of the current start gateway sender gfsh command which will set mustQueueDroppedEvents to true (before the gateway senders are started).

In case the GatewaySender Java API is used to start/stop gateway senders, in order to get the new behavior, given that the scope of the start/ methods is the VM on which it is invoked, it will be necessary to set the mustQueueDroppedEvents accordingly (to true before starting all sender instances and to false after stopping all sender instances) on every VM. To set the value of the variable, the GatewaySender interface will offer the following new method: setMustQueueDroppedEvents(boolean mustQueue). If the new method is not used, the legacy behavior will prevail.

A draft PR of the solution can be found here: https://github.com/apache/geode/pull/5348

Changes and Additions to Public Interfaces

No changes to public interfaces are proposedTwo new methods: setMustQueueDroppedEvents(boolean) and mustQueueDroppedEvents() will be added to the GatewaySender public interface.

Performance Impact

As the proposal implies changing the implementation of the gfsh start gateway sender and  the stop gateway sender commands to be done in two steps, these commands may be slightly slower but not significantly.

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