[jira] [Created] (SPARK-29292) Fix internal usages of mutable collection for Seq in 2.13

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

Sean R. Owen created SPARK-29292:
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             Summary: Fix internal usages of mutable collection for Seq in 2.13
                 Key: SPARK-29292
                 URL: https://issues.apache.org/jira/browse/SPARK-29292
             Project: Spark
          Issue Type: Sub-task
          Components: Spark Core
    Affects Versions: 3.0.0
            Reporter: Sean R. Owen
            Assignee: Sean R. Owen


Kind of related to https://issues.apache.org/jira/browse/SPARK-27681, but a simpler subset. 

In 2.13, a mutable collection can't be returned as a {{scala.collection.Seq}}. It's easy enough to call .toSeq on these as that still works on 2.12.

{code}
[ERROR] [Error] /Users/seanowen/Documents/spark_2.13/core/src/main/scala/org/apache/spark/ExecutorAllocationManager.scala:467: type mismatch;
 found   : Seq[String] (in scala.collection) 
 required: Seq[String] (in scala.collection.immutable) 
{code}



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