Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/4771#issuecomment-76086952
SparkSQLCLIDriver.scala has this code:
// Clean up after we exit
Runtime.getRuntime.addShutdownHook(
new Thread() {
override def run() {
SparkSQLEnv.stop()
}
}
)
This should probably be changed to use
`ShutdownHookManager.get().addShutdownHook()` with the correct priority, like
in `ApplicationMaster.scala`. Otherwise this code will race with HDFS's own
shutdown hook and may cause the exceptions you're seeing.
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