@innominate Please refer the below doc that will give you some idea.  Cloudera Manager automatically sets nproc configuration in /etc/security/limits.conf, but this configuration can be overridden by individual files in /etc/security/limits.d/. This can cause problems with Apache Impala and other components. Make sure that the nproc limits are set sufficiently high, such as 65536 or 262144. 1. https://docs.cloudera.com/documentation/enterprise/6/release-notes/topics/rg_os_requirements.html 2. https://docs.cloudera.com/runtime/7.2.9/configuring-hbase/topics/hbase-configure-ulimit-pam-cli.html ... View more