After installing things on a few nodes I saw this message when Cloudera Manager was “checking things for correctness”:
Cloudera recommends setting /proc/sys/vm/swappiness to 0. Current setting is 60. Use the sysctl command to change this setting at runtime and edit /etc/sysctl.conf for this setting to be saved after a reboot. You may continue with installation, but you may run into issues with Cloudera Manager reporting that your hosts are unhealthy because they are swapping. The following hosts are affected:
Run this on each node: sudo sysctl -w vm.swappiness=0
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