Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/6651#issuecomment-109034226
By the way, here's how I found that this was a bottleneck: I created a new
test suite which takes a short-running Hive test and runs it 100 times
back-to-back, then profiled the suite using YourKit; RandomAccessFile writes
dominated the hot spots chart.
```scala
package org.apache.spark.sql.hive.execution
import org.scalatest.Outcome
class ResetProfilingSuite extends HiveCompatibilitySuite {
override def withFixture(test: NoArgTest): Outcome = {
(1 to 100).map { _ =>
super.withFixture(test)
}.last
}
override def whiteList = Seq("compute_stats_empty_table")
}
```
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