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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