Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2911#issuecomment-60430329
The "IOException: unexpected exception type" error here is actually masking
the real error; this is due to us throwing something other than IOException
from read/writeExternal; I've opened
https://issues.apache.org/jira/browse/SPARK-4080 to fix this (working on a
patch now).
I'm pretty sure that this isn't caused by Snappy, but instead is an
instance of some longer-standing non-deterministic serialization issue in our
code.
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