Sahil Takiar created SPARK-23785:
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             Summary: LauncherBackend doesn't check state of connection before 
setting state
                 Key: SPARK-23785
                 URL: https://issues.apache.org/jira/browse/SPARK-23785
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
    Affects Versions: 2.3.0
            Reporter: Sahil Takiar


Found in HIVE-18533 while trying to integration with the {{InProcessLauncher}}. 
{{LauncherBackend}} doesn't check the state of its connection to the 
{{LauncherServer}} before trying to run {{setState}} - which sends a 
{{SetState}} message on the connection.



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