All published articles are simple and easy to understand and well tested in our development environment. Source code in Mkyong.com is licensed under the MIT License , read this Code License . Bookmarks Using an environment variable does have certain advantages. For one, it is quite easy for a process to opt-out of a Session by simply unsetting the XDG_SESSION_COOKIE variable. Limitations of using an environment variable implementation include not being able to strictly limit visibility of the secret to a particular process ancestry.
Environment Variables. Certain Spark settings can be configured through environment variables, which are read from the conf/spark-env.sh script in the directory where Spark is installed (or conf/spark-env.cmd on Windows). In Standalone and Mesos modes, this file can give machine specific information such as hostnames.
If the environment variable BLOCKSIZE is set, and the -h or -k options are not specified, the block counts will be displayed in units of that size block. EXIT STATUS The df utility exits 0 on success, and >0 if an error occurs.