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  1. Hadoop YARN
  2. YARN-894

NodeHealthScriptRunner timeout checking is inaccurate on Windows



    • Bug
    • Status: Closed
    • Minor
    • Resolution: Fixed
    • 2.1.0-beta, 3.0.0-alpha1
    • 2.1.0-beta
    • nodemanager
    • None
    • Reviewed


      In NodeHealthScriptRunner method, we will set HealthChecker status based on the Shell execution results. Some status are based on the exception thrown during the Shell script execution.

      Currently, we will catch a non-ExitCodeException from ShellCommandExecutor, and if Shell has the timeout status set at the same time, we will also set HealthChecker status to timeout.

      We have following execution sequence in Shell:
      1) In main thread, schedule a delayed timer task that will kill the original process upon timeout.
      2) In main thread, open a buffered reader and feed in the process's standard input stream.
      3) When timeout happens, the timer task will call Process#destroy()
      to kill the main process.

      On Linux, when timeout happened and process killed, the buffered reader will thrown an IOException with message: "Stream closed" in main thread.

      On Windows, we don't have the IOException. Only "-1" was returned from the reader that indicates the buffer is finished. As a result, the timeout status is not set on Windows, and TestNodeHealthService fails on Windows because of this.


        1. ReadProcessStdout.java
          1 kB
          Chuan Liu
        2. wait.cmd
          0.0 kB
          Chuan Liu
        3. wait.sh
          0.0 kB
          Chuan Liu
        4. YARN-894-trunk.patch
          3 kB
          Chuan Liu

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              chuanliu Chuan Liu
              chuanliu Chuan Liu
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