Set fair scheduler pool name only if the pool is defined.
Set fair scheduler pool name only if the pool is defined.

alabid/blinkdb,sjyk/sampleclean,sjyk/sampleclean,lzshlzsh/shark,sameeragarwal/blinkdb,lzshlzsh/shark,alabid/blinkdb,mapr/shark,amplab/shark,mapr/shark,sameeragarwal/blinkdb,mapr/shark,mattyb149/blinkdb,mattyb149/blinkdb,amplab/shark,mattyb149/blinkdb,lzshlzsh/shark,sjyk/sampleclean,amplab/shark,sameeragarwal/blinkdb,alabid/blinkdb