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by vsto 1852 days ago
It is Hadoop that requires (mostly) Java 8 and Java 11 (runtime only). https://cwiki.apache.org/confluence/display/HADOOP/Hadoop+Ja...
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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+).