Why does Ambari treat YARN and MR2 as separate services on console? Should MR2 just be a client like Pig . I know this is not an operations issue but does make you wonder

[#1 · Accepted solution]

It's likely because there are different configuration files (yarn-site.xml and mapred-site.xml), which need to be configured separately. Just like Tez is listed as its own service so you can configure tez-site.xml, but it's really just a client.

[#2]

I figured this out. MR2 is listed as a service because MR history server is associated under that. Ambari could have simply named MR2 as MR2 history server which would probably avoided confusion.

I know it is a silly distraction..