Steve Loughran 9188fa8cce
HADOOP-17126. implement non-guava Precondition checkNotNull
This adds a new class org.apache.hadoop.util.Preconditions which is

* @Private/@Unstable
* Intended to allow us to move off Google Guava
* Is designed to be trivially backportable
  (i.e contains no references to guava classes internally)

Please use this instead of the guava equivalents, where possible.

Contributed by: Ahmed Hussein

Change-Id: Ic392451bcfe7d446184b7c995734bcca8c07286e
2021-09-17 11:06:59 +01:00

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