Which two are features of Hadoop’s rack topology?
A.
Even for small clusters on a single rack, configuring rack awareness will improve
performance
B.
Configuration of rack awareness is accomplished using a configuration file. You cannot
use a rack topology script.
C.
Hadoop gives preference to intra-rack data transfer in order to conserve bandwidth
D.
Rack location is considered in the HDFS block placement policy
E.
HDFS is rack aware but MapReduce daemon are not