Where does Cloudera Manager get the --hostname value for Impala commands?

Question

I am working through the process for activating Kerberos on the Cloudera quick-start VM. The vm begins life with hostname = "quickstart.cloudera" but I had to change it to get it into our local DNS consistently. After changing the name I was able to get everything except impala to come up. The manager is passing it --hostname=quickstart.cloudera even though everything else in the whole system knows the new name. I don't strictly have to have impala running for the tests I need to run but it's driving me nuts. Any clues?

Answer 1

I'm looking at a relatively fresh install of CM 5.3 with Impala 2.1 and I don't see the hostname being passed to the catalog server via cmdline flags.

Unless you're explicitly setting the hostname parameter in CM via a safety-valve configuration (I assume you're not doing this), then Impala gets the hostname to use by calling the gethostname() stdlib function (see the gethostname() man page ). The log output snipped you showed is somewhat deceiving because when the flag isn't set, Impala actually sets that value manually and it shows up as if it were passed by the user.

Anyway, you should check that the hostname is properly changed on the box, which may depend on your OS. A few things to try: check the hostname command returns the name you expect and that you've restarted the OS.