Github user akohli commented on the pull request: https://github.com/apache/spark/pull/13130#issuecomment-219750370 curious on a couple of things, firstly, you are using CacheBuilder with a cache size of 1000, is that sufficient? Wouldn't it be better to catch an exception or detect an error when a jobconf is added to the original map; alternatively is this masking an issue that proper GC is not happening for unreferenced cached configs?
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