Allow pool and user default settings to be set through poolDefaults and
userDefaults elements
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Key: MAPREDUCE-715
URL: https://issues.apache.org/jira/browse/MAPREDUCE-715
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: contrib/fair-share
Reporter: Matei Zaharia
Over time a number of elements have been added to the fair scheduler config
file for setting default running job limits, preemption timeouts, etc for pools
and for users. Right now these are all set in top-level elements in the
allocations file, such as <userMaxJobsDefault>. It would be easier to
understand if there was a <userDefaults> element that contained defaults for
all pools (using the same element names as <user> elements, e.g.
<maxRunningJobs> in this case), and similarly, a <poolDefaults> element for
pool defaults.
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