[jira] [Created] (FLINK-14945) Simplify some code in runtime

[Shang Yuanchun (Jira)]

clay created FLINK-14945:
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             Summary: Simplify some code in runtime
                 Key: FLINK-14945
                 URL: https://issues.apache.org/jira/browse/FLINK-14945
             Project: Flink
          Issue Type: Task
          Components: Runtime / Checkpointing, Runtime / Metrics, Runtime / Task
            Reporter: clay
             Fix For: 1.10.0


I found some code to simplify when using IDEA to inspect the code,  so I submit a PR here, This change only involves code simplification 



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