[jira] [Created] (AMBARI-5973) Usability: Add checks for THP to the Ambari pre-req check for Linux

[Andrew Onischuk (JIRA)]

Andrew Onischuk created AMBARI-5973:
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             Summary: Usability: Add checks for THP to the Ambari pre-req check 
for Linux
                 Key: AMBARI-5973
                 URL: https://issues.apache.org/jira/browse/AMBARI-5973
             Project: Ambari
          Issue Type: Bug
            Reporter: Andrew Onischuk
            Assignee: Andrew Onischuk
             Fix For: 1.7.0


We need to add checks for Transparent Huge Page. With it enabled, we have
pretty horrible performance, and it's enabled by default on RHEL.

Reference: <https://access.redhat.com/site/documentation/en-
US/Red_Hat_Enterprise_Linux/6/html/Performance_Tuning_Guide/s-memory-
transhuge.html>

What we need to do pseudo code:

if (`cat /sys/kernel/mm/redhat_transparent_hugepage/enabled` != 'never'); then  
echo never > /sys/kernel/mm/redhat_transparent_hugepage/enabled  
end

We need to add a check, and then add the 'echo never' to the python script.





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