Github user SaintBacchus commented on the pull request:
https://github.com/apache/spark/pull/9026#issuecomment-147614244
@srowen In this issue there is only one `HiveContext`, but there will have
two `metastoe.Hive` instance in two different class loaderes. And in the
implement of `metastoe.Hive` it will create the each database instance in
loading this class.
So we have to set the configuration `javax.jdo.option.ConnectionURL` to a
temp dir to avoid the problem I mentioned.
And actually this logic was refer to the implement of
[SparkSQLCLIDriver](https://github.com/apache/spark/blob/master/sql/hive-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkSQLCLIDriver.scala#L84)ã
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