liuxian created SPARK-21283:
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             Summary: FileOutputStream should be created as append mode
                 Key: SPARK-21283
                 URL: https://issues.apache.org/jira/browse/SPARK-21283
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
    Affects Versions: 2.3.0
            Reporter: liuxian
            Priority: Minor


`FileAppender` is used to write `stderr` and `stdout` files  in 
`ExecutorRunner`.
 But before writing `ErrorStream` into the the `stderr` file, the header 
information has been written into ,if  FileOutputStream is  not created as 
append mode, the  header information will be lost



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