Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/257#issuecomment-50430334
@tgravescs @NathanHowell is this patch still needed after the latest
security changes? We moved this part out of Executor and into the code that
launches it, so I think it now covers the executor's whole lifetime. This was
done for a good reason in the following patch (3d0a02d):
```
[WIP] SPARK-1676: Cache Hadoop UGIs by default to prevent FileSystem leak
Move the doAs in Executor higher up so that we only have 1 ugi and aren't
leaking filesystems. Fix spark on yarn to work when the cluster is running as
user "yarn" but the clients are launched as the user and want to read/write to
hdfs as the user.
```
So it seems like it would be inefficient to call runAs on each Spark task.
What was the problem here?
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