Github user wangyum commented on the issue:
https://github.com/apache/spark/pull/16527
I don't quit understand @srowen mentioned. so I simply changed it to drop
`dataSize - retainedSize + retainedSize / 10` items at a time.
If max is 100 and there are 150 items, it would drop `(150 - 100 + 100 / 10
= 60)`.
If max is 100 and there are 101 items, it would drop `(101 - 100 + 100 / 10
= 11)`.
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