We use CDH version 5.7.1 and Cloudera Manager 5.8. In Yarn tuning Excel, I see a field called "Physical Cores to Vcores Multiplier" which has the following description: "Set this ratio based on the expected number of concurrent threads per core. Use 1 for CPU intensive tasks up to 4 for standard I/O bound tasks." I could not find a Cloudera Manager setting corresponding to it. How do we tell Yarn that it can use a multiplier of 4 ? Is there a default value to it ? Or is this multiplier indicated to Yarn by setting "yarn.nodemanager.resource.cpu-vcores" parameter to a desired value instead of just the count of physical core ? Say, if I have 24 physical cores, and I intend to use 50% of it for Yarn, then should I put 12 for this parameter to indicate that I want a ratio of 1:1 and put 48 to indicate a ratio of 1:4 ? We use static pool resource allocation for various Hadoop components (Hbase, Solr, Hadoop, Yarn) and we set ~50% of resources to Yarn. But I could not find the multiplier anywhere. Thanks, Vivek
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