The expression is everything after start-opentsdb.sh.
Specify the ZooKeeper quorum of the external HBase cluster.
To specify a ZooKeeper quorum, create a comma-separated list of all quorum
members. Specify each member of the quorum with a hostname or IP address, the colon
character (:), and then the port number on which the ZooKeeper
service is listening. Between start-opentsdb.sh and the ZooKeeper
quorum list, include at least one empty space.
The following example shows the correct syntax for a 3-member ZooKeeper quorum: