Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/1956#issuecomment-52262225
This occurs when an executor process shuts down while tasks are executing
(e.g. because the driver disassociated or an OOME).
Hadoop FileSystems register a shutdown hook to close themselves.
RecordReaders get closed in a finally block after the tasks that they're used
in.
So there's a race between these two and I can't think of a good way to make
one execute after the other. I'm a little confused as to why the HadoopRDD
finally block is running at all. Some googling seems to indicate that finally
blocks don't run during a System.exit(). And I would think a ShutdownHook
would run after that happens anyway. So I can't claim to have 100%
understanding of what's going on here. Spark isn't closing the FileSystem on
its own.
More generally, think logging a warning is overkill on a reader close error.
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