Description
AvroMode uses the same configuration property for both shuffle and bundle configuration. If the bundle's AvroMode for a map/reduce round doesn't match the shuffle's AvroMode, then the bundle wins. In some cases, this prevents the shuffle from being able to write data, e.g., because GENERIC is used instead of REFLECT.
A work-around if to set the strict mode to delegate reader and writer construction to the more permissive one:
AvroMode.GENERIC.override(AvroMode.REFLECT);