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Cloudera recommends several tuning mechanisms and best practices for improving performance. See the Optimizing Performance in Cloudera Runtime section in the Cloudera Private Cloud Base documentation.
If your cluster hosts are running RHEL/CentOS 7.x or 8.x, disable the "tuned" service.
Minimize anonymous page faults by setting vm.swappiness to a value from 1 through 10. This frees them from the page cache before swapping application pages (this reduces the OOM-killer invocation). Cloudera recommends setting this parameter to 1.
Most Linux platforms supported by Cloudera Runtime include a feature called transparent hugepages (THP) which interacts poorly with Hadoop workloads and can seriously degrade performance. Cloudera recommends disabling THP.