[jira] [Created] (SPARK-4629) Spark SQL uses Hadoop Configuration in a thread-unsafe manner when writing Parquet files

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

Michael Allman created SPARK-4629:
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             Summary: Spark SQL uses Hadoop Configuration in a thread-unsafe manner when writing Parquet files
                 Key: SPARK-4629
                 URL: https://issues.apache.org/jira/browse/SPARK-4629
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 1.1.0
            Reporter: Michael Allman


The method {{ParquetRelation.createEmpty}} mutates its given Hadoop {{Configuration}} instance to set the Parquet writer compression level (cf. https://github.com/apache/spark/blob/v1.1.0/sql/core/src/main/scala/org/apache/spark/sql/parquet/ParquetRelation.scala#L149). This can lead to a {{ConcurrentModificationException}} when running concurrent jobs sharing a single {{SparkContext}} which involve saving Parquet files.

Our "fix" was to simply remove the line in question and set the compression level in the hadoop configuration before starting our jobs.



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