Hi @SwasBigData
HDP was the fully open source distribution of the Apache Hadoop data analysis platform offered commercially by Hortonworks prior to its merger with Cloudera in January 2019. The "Sandbox" is just a version of the HDP binaries configured for VMware or VirtualBox machines (and Docker containers, as well).
Why is it called the sandbox? From Learning the Ropes of the HDP Sandbox:
The Sandbox is a straightforward, pre-configured learning environment that contains the latest developments from Apache Hadoop, specifically the Hortonworks Data Platform (HDP). The Sandbox comes packaged in a virtual environment that can run in the cloud or on your personal machine.
The intent of the HDP Sandbox is to facilitate learning by developers and operators new to Hadoop by drastically reducing the effort involved in getting a Hadoop cluster up and running.
The current product is CDP, Cloudera Data Platform, the last letter is P, not H (previously Cloudera marketed a distribution of Hadoop called CDH; as a completely open-source software distribution, CDH happens to still be available). The free trial you mentioned is probably for CDP, not CDH. I am not aware of a CDH free trial.
There are currently two "form factors" of CDP, one for Public Cloud Services using AWS or Azure, and another for Data Center deployment. The version of CDP Public Cloud for GCP has not yet been released.
If you have a lot of understanding of build and deployment tools, you can, with some effort, install and configure CDP Data Center (or HDP or CDH, for that matter) on GCE VMs. Once the 60 day trial was over, you'd need to acquire a subscription to continue using CDP Data Center. The way to get details for how much this would cost is to reach out to a Cloudera Sales Representative.
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