Is it possible to have executors with different amounts of memory on a Mesos cluster? Or am I bounded by the machine with the least memory? (Assuming I want to use all available cpus).
Spark executors with different amounts of memory on Mesos
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Short anwer: No.
Unfortunately, Spark Mesos and YARN only allow giving as much resources (cores, memory, etc.) per machine as your worst machine has (discussion). Ideally, the cluster should be homogeneous in order to take full advantage of its resources.
However, there might exist a workaround for your problem. According to the linked source above, Spark standalone allows creating multiple workers on some machines. You might modify your worker configuration to be appropriate for the worst machine, and start multiple workers on these.
For example, given two computers with 4G and 20G memory respectively, you could create 5 workers on the latter, each with a configuration to use just 4G of memory, as limited per the first machine.