Details
Major Description
To illustrate the issue, run with the following order of the webserver_certificate_file,webserver_private_key_file grouped flags:
./bin/kudu-tserver --webserver_certificate_file=/tmp/x.pem --webserver_private_key_file=/tmp/y.pem WARNING: Logging before InitGoogleLogging() is written to STDERR E0503 18:43:23.122520 21873 webserver_options.cc:93] --webserver_certificate_file and --webserver_private_key_file must be set as a group E0503 18:43:23.122825 21873 webserver_options.cc:93] --webserver_certificate_file and --webserver_private_key_file must be set as a group ERROR: failed validation of new value '/tmp/y.pem' for flag 'webserver_private_key_file'
Specifying the flags in different order passes the validation with no issues.
The problem happens because a gflag validator is fired upon parsing particular flag, but since current 'group' flags validators assume the counterpart flags have already been parsed and set, it depends on the order of the flags in the command line.