Github user YanTangZhai commented on the pull request:
https://github.com/apache/spark/pull/2059#issuecomment-52884506
Hi @JoshRosen SparkContext1 creates broadcastManager and initializes
HttpBroadcast object. HttpBroadcast creates httpserver and broadcastDir and so
on. However SparkContext2 in the same process won't initialize HttpBroadcast
object when creating broadcastManager. Since HttpBroadcast object is marked
initialized and will not be initialized any more. SparkContext1 and
SparkContext2 will share the same HttpBroadcast object. When SparkContext1
stops HttpBroadcast, HttpBroadcast in SparkContext2 actually is stopped. When
HttpBroadcast1 cleans up files, some files owned by SparkContext2 may be
removed. Since they are the same one.
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