Github user StephanEwen commented on the pull request: https://github.com/apache/flink/commit/2477161352e12e75e2f0f85b5833ad04dc6d31f2#commitcomment-18252297 In flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/StreamTaskState.java: In flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/StreamTaskState.java on line 103: The pattern is - cache the reference on stack (immutable against concurrent modifications) - set the heap reference to null - proceed based on the stack reference I think that should work. If the heap reference was non null initially before, the stack reference is non null, and the condition is true.
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