Github user tellison commented on the pull request:
https://github.com/apache/spark/pull/6282#issuecomment-105597512
So here's the story.
SSLOptions allows for a set of requested cipher suites to be named.
When given a set of cipher suite names, Jetty will filter these requested
cipher suites by the list of Provider supported cipher suite names. However,
Netty passes the suite names straight through to the JDK, and if a cipher suite
is unsupported the JDK will throw an IllegalArgumentException.
Given the IBM JDK and Oracle JDK have different lists of supported cipher
suites, the way to make this test pass on both is to use suites that are common
to both - and that is the patch proposed.
An alternative approach is for Spark to filter the cipher names when
creating the Akka config. It depends if you want Akka to fail when passed an
unsupported cipher suite name (as it does today) or ignore it (as Jetty does
today).
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