rkhachatryan commented on a change in pull request #10542: 
[FLINK-12484][runtime] move checkpoint lock to source task
URL: https://github.com/apache/flink/pull/10542#discussion_r374081260
 
 

 ##########
 File path: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/StreamTask.java
 ##########
 @@ -154,11 +154,9 @@
         * to ensure that we don't have concurrent method calls that void 
consistent checkpoints.
         * <p>CheckpointLock is superseded by {@link MailboxExecutor}, with
         * {@link StreamTaskActionExecutor.SynchronizedStreamTaskActionExecutor 
SynchronizedStreamTaskActionExecutor}
-        * to provide lock to {@link SourceStreamTask} (will be pushed down 
later). </p>
-        * {@link StreamTaskActionExecutor.SynchronizedStreamTaskActionExecutor 
SynchronizedStreamTaskActionExecutor}
-        * will be replaced <b>here</b> with {@link StreamTaskActionExecutor} 
once {@link #getCheckpointLock()} pushed down to {@link SourceStreamTask}.
+        * to provide lock to {@link SourceStreamTask}. </p>
         */
-       private final 
StreamTaskActionExecutor.SynchronizedStreamTaskActionExecutor actionExecutor;
+       protected final StreamTaskActionExecutor actionExecutor;
 
 Review comment:
   changed to `private`

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