Github user jacek-lewandowski commented on the pull request: https://github.com/apache/spark/pull/1980#issuecomment-60174311 Btw. I was trying to do SSL for UI as well. One thing I'm afraid of is that this solution would break any recovery information for Spark Master (different signature of WorkerInfo). Also, it doesn't allow to run the cluster in mixed mode during upgrade - some nodes running older Spark and some nodes running newer Spark, because it changes the signature of messages. Anyway, this is very minor I think.
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