[jira] [Created] (SPARK-29291) Remove use of procedure-like method definition for 2.13

["Sean R. Owen (Jira)" <ji...@apache.org>]

Sean R. Owen created SPARK-29291:
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             Summary: Remove use of procedure-like method definition for 2.13
                 Key: SPARK-29291
                 URL: https://issues.apache.org/jira/browse/SPARK-29291
             Project: Spark
          Issue Type: Sub-task
          Components: Build, Spark Core
    Affects Versions: 3.0.0
            Reporter: Sean R. Owen
            Assignee: Sean R. Owen


Scala 2.13 warns where procedure-like syntax is used to define methods:

{code}
[WARNING] [Warn] /Users/seanowen/Documents/spark_2.13/core/src/main/scala/org/apache/spark/ContextCleaner.scala:74: procedure syntax is deprecated: instead, add `: Unit =` to explicitly declare `run`'s return type
...
{code}

There are a lot of them, but it's easy to fix.

{code}
def foo(): Unit = { }
{code}

not 

{code}
def foo() { }
{code}



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