KAI XIE b3c14d4132 HADOOP-16158. DistCp to support checksum validation when copy blocks in parallel (#919)
* DistCp to support checksum validation when copy blocks in parallel

* address review comments

* add checksums comparison test for combine mode

(cherry picked from commit c765584eb231f8482f5b90b7e8f61f9f7a931d09)
2019-08-18 18:48:21 -07:00
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