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https://reviews.apache.org/r/31508/
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Review request for Aurora, Bill Farner and Zameer Manji.


Bugs: AURORA-1156
    https://issues.apache.org/jira/browse/AURORA-1156


Repository: aurora


Description
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This is #1 from the attached ticket. Brings anywhere between 2% and 18% better 
perf in bechmark scenarios.

BEFORE:
```
Benchmark                                                                       
        Mode  Samples         Score         Error  Units
o.a.a.b.SchedulingBenchmarks.InsufficientResourcesSchedulingBenchmark.runBenchmark
      avgt      100    909677.646 ±   10103.466  ns/op
o.a.a.b.SchedulingBenchmarks.LimitConstraintMismatchSchedulingBenchmark.runBenchmark
    avgt      100   1332768.205 ±   16664.386  ns/op
o.a.a.b.SchedulingBenchmarks.PreemptorFallbackForLargeClusterBenchmark.runBenchmark
     avgt      100  69304405.590 ± 1536571.317  ns/op
o.a.a.b.SchedulingBenchmarks.ValueConstraintMismatchSchedulingBenchmark.runBenchmark
    avgt      100    870348.707 ±   16815.495  ns/op
```

AFTER:
```
Benchmark                                                                       
        Mode  Samples         Score         Error  Units
o.a.a.b.SchedulingBenchmarks.InsufficientResourcesSchedulingBenchmark.runBenchmark
      avgt      100    749864.522 ±    6568.372  ns/op
o.a.a.b.SchedulingBenchmarks.LimitConstraintMismatchSchedulingBenchmark.runBenchmark
    avgt      100   1125995.085 ±   19241.796  ns/op
o.a.a.b.SchedulingBenchmarks.PreemptorFallbackForLargeClusterBenchmark.runBenchmark
     avgt      100  68028627.539 ± 1412569.919  ns/op
o.a.a.b.SchedulingBenchmarks.ValueConstraintMismatchSchedulingBenchmark.runBenchmark
    avgt      100    766747.584 ±   13310.142  ns/op
```


Diffs
-----

  src/main/java/org/apache/aurora/scheduler/async/preemptor/PreemptorImpl.java 
a4e8dd3b9b58dac2d8507042500b7a479d46ebc0 
  
src/test/java/org/apache/aurora/scheduler/async/preemptor/PreemptorImplTest.java
 44cd8f79493f0f247cd876ef78b30b4f813314c4 

Diff: https://reviews.apache.org/r/31508/diff/


Testing
-------

./gradlew jmh


Thanks,

Maxim Khutornenko

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