hbase.bucketcache.size increase from 2G to 4G cause RegionServer Out of Memory

[#1]

It is a dedicated HBase cluster, each node has 128GB RAM. It is HDP 2.3 and we follow HBase optimizing IO instruction: http://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.3.2/bk_Sys_Admin_Guides/content/ref-db219cd6-c58...

[#2 · Accepted solution]

Make sure that you have configured -XX:MaxDirectMemorySize correctly.