There is now! 🙂 http://blog.cloudera.com/blog/2015/12/docker-is-the-new-quickstart-option-for-apache-hadoop-and-cloudera/ The image is not yet available for a direct download, so Docker Hub is the place to get it right away: https://hub.docker.com/r/cloudera/quickstart/
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VMware Workstation / Player or VMware Fusion (versions that are believed to work well are documented here: http://www.cloudera.com/content/www/en-us/documentation/enterprise/latest/topics/cloudera_quickstart_vm.html). If you don't have one of these product, you won't be able to run the QuickStart VM for VMware. You can try them out here: http://www.vmware.com/products/. Another option is the VirtualBox version which just requires VirtualBox: https://www.virtualbox.org/.
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The data format will ensure records are intact before being sent to the mapper function. I believe this is done by sending partial records to the machine they will be mapped on (so the overwhelming majority of the data is processed in place, but half a line per block or so may still be exchanged). Tom White's book The Definitive Guide To Hadoop does a good job of covering details like this.
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The bookmark needs to be removed, I'm afraid: as of CDH 5.5, only Spark-on-YARN is supported, so there is no Spark Master to run. When running the spark shell, for instance, one specify 'yarn-client' as the master.
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The command used to set the background is as follows: gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory --type string --set /desktop/gnome/background/picture_filename '/usr/share/backgrounds/cloudera/wall_HD_logo.jpg' I would imagine that should work if you change the filename to the desired image, even if setting it via GNOME's menus does not work (did you try that, by the way?)
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