
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