See my answers inline.
> 1. Mesos Containerizer > - posix isolators > - cgroups isolators > Mesos container also allows you to use custom isolators. > 2. Docker containerizer > - docker isolators > Docker containerizer doesn't have a concept of isolator(s). > 3. Custom containerizer > - my isolators > It is up to the custom containerizer how it wants to do containerization; it could've have a concept of isolator or not. - Executors: > Generally: Each executor has the minimum resources assigned by default > (0.01 CPU & 32MB MEM) > Executor expands its resources when a task is assigned > (executor default resources + task resources) > Only the built-in "default" executor needs to have a minimum amount of resources. Other built-in executors and custom executors can technically have zero resources. > 1. Mesos commandExecutor > - run shell commands or docker > - Each executor is a container that can have only one task to > execute, you can't specify group of tasks > - Isolation between executors/containers so isolation between > tasks because each task runs in one container > Not that the executor that runs shell commands is called the "command" executor (run by mesos containerizer), whereas the one that runs docker images is called "docker" executor (run by docker containerizer). > 2. Mesos defaultExecutor > - can run shell commands or a custom executor file e.g > TestExecutor.java (from tests) > - can execute one task per executor/container or multiple tasks (1 > group). > - No resource isolation between tasks of the same container > "default" executor is another built-in executor. it can run a group of tasks. it does not run any other (custom) executor. > 3. Custom Executor > - ????? > you could write a custom executor that can run a single task or group of tasks. totally up to you. > So, i guess i can use one offer to run some tasks on the same agent with > commandExecutor or with defaultExecutor…. > But how would somebody specify if the offer corresponds to one agent or > multiple agents? > Each offer has an 'AgentId' which corresponds to one agent. HTH, Vinod
