Hi, guys My master's /usr/bin was deleted, and i have copy other slave's /usr/bin to the master. but when i type spark-shell, it occur this error: spark-shell error but when i type /opt/cloudera/parcels/CDH/bin/spark-shell, it works fine. Seems the commands in /user/bin directory should be soft link to/ opt/cloudera/parcels/CDH , is there any way to recover it?   thanks a lot. ... View more