Github user ScrapCodes commented on the pull request:
https://github.com/apache/spark/pull/4043#issuecomment-70220772
LinkedHashMap was introduced to maintain the insertion order of
stagesIds(Hasmap will lead to arbitrary order), all map(s) in scala has return
an `Option` on `remove` behavior. Even in java calling remove on inexistent key
returns null. Do you still want me to change it? Also may be changing the name
pendingStages to pendingStagesMap will avoid that confusion ? and should the
same apply to - already existing field activeStages ?
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