Github user sarutak commented on the pull request:
https://github.com/apache/spark/pull/3956#issuecomment-70746674
Actually I've never seen issues with this for Spark because I've never set
`SPARK_USE_CONC_INCR_GC` but I have issues caused by not setting
`MaxTenuringThreshold` and `SurvivorRatio` for other software like Hadoop or
etc. I had extra major GC.
So, this change is just a rule of thumb.
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