denis-chudov commented on code in PR #4707:
URL: https://github.com/apache/ignite-3/pull/4707#discussion_r1841211991


##########
modules/placement-driver/src/main/java/org/apache/ignite/internal/placementdriver/AssignmentsTracker.java:
##########
@@ -147,48 +141,137 @@ public CompletableFuture<List<TokenizedAssignments>> 
getAssignments(
     }
 
     /**
-     * Gets assignments.
+     * Gets stable assignments.
      *
-     * @return Map replication group id to its assignment.
+     * @return Map replication group id to its stable assignments.
      */
-    public Map<ReplicationGroupId, TokenizedAssignments> assignments() {
-        return groupAssignments;
+    Map<ReplicationGroupId, TokenizedAssignments> stableAssignments() {
+        return groupStableAssignments;
     }
 
     /**
-     * Meta storage assignments watch.
+     * Gets pending assignments.
+     *
+     * @return Map replication group id to its pending assignments.
      */
-    private class AssignmentsListener implements WatchListener {
-        @Override
-        public CompletableFuture<Void> onUpdate(WatchEvent event) {
-            assert !event.entryEvents().stream().anyMatch(e -> 
e.newEntry().empty()) : "New assignments are empty";
-
-            if (LOG.isDebugEnabled()) {
-                LOG.debug("Assignment update [revision={}, keys={}]", 
event.revision(),
-                        event.entryEvents().stream()
-                                .map(e -> new 
ByteArray(e.newEntry().key()).toString())
-                                .collect(Collectors.joining(",")));
+    Map<ReplicationGroupId, TokenizedAssignments> pendingAssignments() {
+        return groupStableAssignments;
+    }
+
+    private WatchListener createStableAssignmentsListener() {
+        return new WatchListener() {
+            @Override
+            public CompletableFuture<Void> onUpdate(WatchEvent event) {
+                assert areAssignmentsPresentedInEvent(event) : "New 
assignments are empty";
+
+                if (LOG.isDebugEnabled()) {
+                    LOG.debug("Stable assignments update [revision={}, 
keys={}]", event.revision(), collectKeysFromEventAsString(event));
+                }
+
+                handleReceivedAssignments(event, STABLE_ASSIGNMENTS_PREFIX, 
groupStableAssignments);
+
+                return nullCompletedFuture();
             }
 
-            for (EntryEvent evt : event.entryEvents()) {
-                Entry entry = evt.newEntry();
+            @Override
+            public void onError(Throwable e) {
+            }
+        };
+    }
 
-                var replicationGrpId = TablePartitionId.fromString(
-                        new String(entry.key(), 
StandardCharsets.UTF_8).replace(STABLE_ASSIGNMENTS_PREFIX, ""));
+    private WatchListener createPendingAssignmentsListener() {
+        return new WatchListener() {
+            @Override
+            public CompletableFuture<Void> onUpdate(WatchEvent event) {
+                assert areAssignmentsPresentedInEvent(event) : "New 
assignments are empty";

Review Comment:
   Ok it's up to you, but I mean, if you remove assertion, please add `return` 
there to be sure that we dont try to process empty assignements



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