[jira] [Created] (SPARK-16349) IsolatedClientLoader ignores needed Hadoop classes not present in Spark's loader

["Marcelo Vanzin (JIRA)" <ji...@apache.org>]

Marcelo Vanzin created SPARK-16349:
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             Summary: IsolatedClientLoader ignores needed Hadoop classes not present in Spark's loader
                 Key: SPARK-16349
                 URL: https://issues.apache.org/jira/browse/SPARK-16349
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.0.0
            Reporter: Marcelo Vanzin


While trying to use a custom classpath for metastore jars (spark.sql.hive.metastore.jars pointing at some filesystem path), I ran into the following issue:

{noformat}
java.lang.ClassNotFoundException: java.lang.NoClassDefFoundError: org/apache/hadoop/mapred/MRVersion when creating Hive client using classpath
{noformat}

The issue here is that {{MRVersion}} is not packaged anywhere with Spark, and the code in {{IsolatedClientLoader}} only ever tries the parent class loader when loading hadoop classes in this configuration. So even though I had the class in the list of files in {{spark.sql.hive.metastore.jars}}, Spark never tries to load it.



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