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From Ron Isaacson <isaacson....@gmail.com>
Subject Swappiness recommendation
Date Wed, 25 Jul 2018 22:29:54 GMT
Hello,

Looking at the System Administrator’s Guide
<https://nifi.apache.org/docs/nifi-docs/html/administration-guide.html>, I
see that you recommend setting vm.swappiness = 0 in /etc/sysctl.conf. This
is fine in most cases, but must be avoided on RHEL 6.4 through 6.7.

On RedHat kernels pre-2.6.32-642, there's a bug which can cause the OOM
killer to aggressively kill processes even when RAM is still available and
swap is unused. See this RedHat article
<https://access.redhat.com/solutions/1149413> for more information. (A
RedHat support login is required; if you don't have one, please contact me
off-list.)

I kindly recommend you add a note to your docs advising users not to apply
this setting on affected kernels. Thank you!

  - Ron

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