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Re:Uber Engineering Tricks of the Trade: Tuning JVM Memory f... by tomnipotent on Wednesday May 19, 2021 @04:37AM (#27206003)
That's for Hadoop 3 - Uber is on CDH 5 last I read, which has min support for Java 7 and it sounds like that's what they're using if the CMS GC was being used (unless it just happened to work better for them in Java 8+).

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