Github user harishreedharan commented on the pull request:
https://github.com/apache/spark/pull/6644#issuecomment-127767982
I think this makes sense. As @andrewor14 mentioned above, for long running
apps where many executors have been added and removed, this could cause lot of
state to accumulate on the driver. We should perhaps restrict the time limit
for which old executor state is maintained and remove it when the time limit
expires.
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