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https://reviews.apache.org/r/33487/
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Review request for Aurora and Bill Farner.


Repository: aurora


Description
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With the asynchronous preemptor and a series of other perf improvements, our 
scheduling alrorithm perfomance improved 230X - 270X:

Before
```
Benchmark                                                                       
 Mode  Samples    Score   Error  Units
SchedulingBenchmarks.InsufficientResourcesSchedulingBenchmark.runBenchmark     
thrpt      100  214.098 ± 2.407  ops/s
SchedulingBenchmarks.ConstraintMismatchsSchedulingBenchmark.runBenchmark       
thrpt      100  180.754 ± 2.407  ops/s
```
After
```
Benchmark                                                                      
Mode  Cnt      Score      Error  Units
SchedulingBenchmarks.InsufficientResourcesSchedulingBenchmark.runBenchmark    
thrpt   10  50328.609 ± 1356.151  ops/s
SchedulingBenchmarks.ValueConstraintMismatchSchedulingBenchmark.runBenchmark  
thrpt   10  49237.475 ± 1803.555  ops/s
```

We are only limited by the storage perf now (native + H2). Real life scheduling 
round latencies are hovering around 25msec on average (SSD-backed native log 
store), which suggests a new default scheduling rate of 40/sec.


Diffs
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  src/main/java/org/apache/aurora/scheduler/async/AsyncModule.java 
35c7e43746783ec81254b473848fb8579f9d233e 

Diff: https://reviews.apache.org/r/33487/diff/


Testing
-------


Thanks,

Maxim Khutornenko

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