MapReduce for Hive Replication

A temporary fix is needed in MapReduce for Hive replication. The string /etc/hadoop/conf must be added to the mapreduce.application.classpath property in mapred-site through Ambari, before /etc/hadoop/conf/secure. For example, the end of the parameter will look like: mapreduce.application.classpath=...:/etc/hadoop/conf:/etc/hadoop/conf/secure.

This is a temporary workaround for https://hortonworks.jira.com/browse/BUG-56803 fixed in versions of HDP 2.4.2 and later. This workaround may cause MapReduce jobs to fail during rolling upgrades due to the underlying configuration changing during job execution.