Sandy Ryza created YARN-782:
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Summary: vcores-pcores ratio functions differently from vmem-pmem
ratio in misleading way
Key: YARN-782
URL: https://issues.apache.org/jira/browse/YARN-782
Project: Hadoop YARN
Issue Type: Improvement
Components: nodemanager
Affects Versions: 2.0.4-alpha
Reporter: Sandy Ryza
Assignee: Sandy Ryza
Priority: Critical
The vcores-pcores ratio functions differently from the vmem-pmem ratio in the
sense that the vcores-pcores ratio has an impact on allocations and the
vmem-pmem ratio does not.
If I double my vmem-pmem ratio, the only change that occurs is that my
already-scheduled containers are less likely to be killed for using too much
virtual memory. But if I double my vcore-pcore ratio, my nodes will appear to
the ResourceManager to contain double the amount of CPU space, which will
affect scheduling decisions.
The lack of consistency will exacerbate the fundamentally difficult problem of
resource configuration.
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