[jira] [Created] (SPARK-16781) java launched by PySpark as gateway may not be the same java used in the spark environment

["Michael Berman (JIRA)" <ji...@apache.org>]

Michael Berman created SPARK-16781:
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             Summary: java launched by PySpark as gateway may not be the same java used in the spark environment
                 Key: SPARK-16781
                 URL: https://issues.apache.org/jira/browse/SPARK-16781
             Project: Spark
          Issue Type: Bug
          Components: PySpark
    Affects Versions: 1.6.2
            Reporter: Michael Berman


When launching spark on a system with multiple javas installed, there are a few options for choosing which JRE to use, setting `JAVA_HOME` being the most straightforward.

However, when pyspark's internal py4j launches its JavaGateway, it always invokes `java` directly, without qualification. This means you get whatever java's first on your path, which is not necessarily the same one in spark's JAVA_HOME.

This could be seen as a py4j issue, but from their point of view, the fix is easy: make sure the java you want is first on your path. I can't figure out a way to make that reliably happen through the pyspark executor launch path, and it seems like something that would ideally happen automatically. If I set JAVA_HOME when launching spark, I would expect that to be the only java used throughout the stack.



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