belugabehr commented on pull request #172:
URL: https://github.com/apache/tez/pull/172#issuecomment-1002853340


   @jteagles  I create a small driver with JMH:
   
   ```
   Benchmark           Mode  Cnt        Score        Error  Units
   TestSplit.master   thrpt   30  5324642.492 ± 228078.761  ops/s
   TestSplit.tez4365  thrpt   30  1809324.533 ±  37792.272  ops/s
   ```
   
   Quite a bit slower, but still an impressive 1,809,324 string per second on 
my dated hardware.  Using regex provides for fewer lines of code and makes it 
more readable.  But your call.  If you're not accepting of it, consider the 
unit tests update.


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