[jira] [Created] (FLINK-12289) Fix bugs and typos in Memory manager

[Shang Yuanchun (Jira)]

Liya Fan created FLINK-12289:
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             Summary: Fix bugs and typos in Memory manager
                 Key: FLINK-12289
                 URL: https://issues.apache.org/jira/browse/FLINK-12289
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Operators
            Reporter: Liya Fan
            Assignee: Liya Fan


According to the JavaDoc,  MemoryManager.release method should throw an NPE if the input argument is null. 

In addition, there are some typos in class MemoryManager.



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