aljoscha commented on a change in pull request #14913:
URL: https://github.com/apache/flink/pull/14913#discussion_r580228596



##########
File path: 
flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBKeyedStateBackend.java
##########
@@ -290,6 +294,16 @@ public RocksDBKeyedStateBackend(
         this.nativeMetricMonitor = nativeMetricMonitor;
         this.sharedRocksKeyBuilder = sharedRocksKeyBuilder;
         this.priorityQueueFactory = priorityQueueFactory;
+        if (priorityQueueFactory instanceof HeapPriorityQueueSetFactory) {

Review comment:
       Not sure I like the `instanceof` here. Could the functionality maybe me 
a method on the queue factory?

##########
File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/state/AbstractKeyedStateBackend.java
##########
@@ -348,7 +349,7 @@ public int numKeyValueStatesByName() {
     }
 
     // TODO remove this once heap-based timers are working with RocksDB 
incremental snapshots!
-    public boolean requiresLegacySynchronousTimerSnapshots() {
+    public boolean requiresLegacySynchronousTimerSnapshots(CheckpointType 
checkpointOptions) {

Review comment:
       The parameter seems to never be used?




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