It won't be necessary with futur versions (4.5+) as it's now configurable with a variable. see https://github.com/cloudera/hadoop-common/commit/ce45ef009f75ef3a95a3717e28e4d570633be645
and FYI it's set to 2.5.0 since commit https://github.com/cloudera/hadoop-common/commit/d37dc3335698cec03437919e7dab4076b1d784c7 (still in beta)