Why there is a mapreduce.jobtracker.address configuration on YARN?

Question

YARN is the Hadoop second generation that not use the jobtracker daemon anymore, and substitute it with resource manager. But why, on mapred-site.xml hadoop 2 there is an ma

Answer 1

setting yarn.resourcemanager.address is not mandatory:

refer following link which explains migration from MR1 to MR2

https://www.cloudera.com/documentation/enterprise/5-4-x/topics/cdh_ig_mapreduce_to_yarn_migrate.html