kgusakov commented on code in PR #4843:
URL: https://github.com/apache/ignite-3/pull/4843#discussion_r1890152393


##########
modules/table/src/main/java/org/apache/ignite/internal/table/distributed/disaster/DisasterRecoveryManager.java:
##########
@@ -569,26 +605,64 @@ private static Collection<CatalogZoneDescriptor> 
filterZones(Set<String> zoneNam
         return zoneDescriptors;
     }
 
+    private CompletableFuture<Void> processNewRequest(DisasterRecoveryRequest 
request) {
+        return processNewRequest(request, -1);
+    }
+
     /**
      * Creates new operation future, associated with the request, and writes 
it into meta-storage.
      *
      * @param request Request.
+     * @param revision Revision of event, which produce this recovery request.
      * @return Operation future.
      */
-    private CompletableFuture<Void> processNewRequest(DisasterRecoveryRequest 
request) {
+    private CompletableFuture<Void> processNewRequest(DisasterRecoveryRequest 
request, long revision) {
         UUID operationId = request.operationId();
 
         CompletableFuture<Void> operationFuture = new CompletableFuture<Void>()
                 .whenComplete((v, throwable) -> 
ongoingOperationsById.remove(operationId))
                 .orTimeout(TIMEOUT_SECONDS, TimeUnit.SECONDS);
 
+        byte[] serializedRequest = VersionedSerialization.toBytes(request, 
DisasterRecoveryRequestSerializer.INSTANCE);
+
         ongoingOperationsById.put(operationId, operationFuture);
 
-        metaStorageManager.put(RECOVERY_TRIGGER_KEY, 
VersionedSerialization.toBytes(request, 
DisasterRecoveryRequestSerializer.INSTANCE));
+        if (revision != -1) {
+            putRecoveryTriggerIfRevisionIsNotProcessed(
+                    request.zoneId(),
+                    longToBytesKeepingOrder(revision),
+                    serializedRequest,
+                    operationId
+            );
+        } else {
+            metaStorageManager.put(RECOVERY_TRIGGER_KEY, serializedRequest);
+        }
 
         return operationFuture;
     }
 
+    private void putRecoveryTriggerIfRevisionIsNotProcessed(

Review Comment:
   As I know we have no rules about javadocs for private methods - the name of 
this method is clear enough I thought. To cut the time of discussion ping-pong 
- added, anyway)



##########
modules/table/src/main/java/org/apache/ignite/internal/table/distributed/disaster/DisasterRecoveryManager.java:
##########
@@ -569,26 +605,64 @@ private static Collection<CatalogZoneDescriptor> 
filterZones(Set<String> zoneNam
         return zoneDescriptors;
     }
 
+    private CompletableFuture<Void> processNewRequest(DisasterRecoveryRequest 
request) {

Review Comment:
   Added



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