public static AssignRegionRequest buildAssignRegionRequest(final byte[] regionName) {
    AssignRegionRequest.Builder builder = AssignRegionRequest.newBuilder();
    builder.setRegion(buildRegionSpecifier(RegionSpecifierType.REGION_NAME, regionName));
    return builder.build();
  }
Create a protocol buffer AssignRegionRequest
@return an AssignRegionRequest
hbase-client/src/main/java/org/apache/hadoop/hbase/shaded/protobuf/RequestConverter.java