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https://issues.apache.org/jira/browse/SPARK-4629?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Cheng Lian reassigned SPARK-4629:
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Assignee: Cheng Lian
> 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
> Assignee: Cheng Lian
>
> 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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