question How should I set InitiatingHeapOccupancyPercent of G1GC for NameNode with high usage of jvm heap in Support Questions

question How should I set InitiatingHeapOccupancyPercent of G1GC for NameNode with high usage of jvm heap in Support Questions https://community.cloudera.com/t5/Support-Questions/How-should-I-set-InitiatingHeapOccupancyPercent-of-G1GC-for/m-p/180782#M143024 Now I are trying to change GC from CMS to G1GC.And let's say, current situation of NameNode with CMS are<PRE>Physical memory size : 140 GB -Xmx100G -Xms100G current actual heap usage : 70 - 80 GB (So, usage is around 80%.) -XX:InitiatingHeapOccupancyPercent : 90 </PRE>The default value of "-XX:InitiatingHeapOccupancyPercent" is 45. If I set 45% for "-XX:InitiatingHeapOccupancyPercent" for this NameNode, I think, current heap usage always hits the threshold...Could you advice how I should tune "-XX:InitiatingHeapOccupancyPercent" for this NameNode? Thu, 07 Sep 2017 19:17:01 GMT tomo_hirano 2017-09-07T19:17:01Z