The above figure shows the main components of Mesos. Mesos consists of a master daemon that manages slave daemons running on each cluster node, and mesos applications (also called frameworks) that run tasks on these slaves.
The master enables fine-grained sharing of resources (cpu, ram, ...) across applications by making them resource offers. Each resource offer contains a list of
A framework running on top of Mesos consists of two components: a scheduler that registers with the master to be offered resources, and an executor process that is launched on slave nodes to run the framework's tasks (see the App/Framework development guide for more details about application schedulers and executors). While the master determines how many resources are offered to each framework, the frameworks' schedulers select which of the offered resources to use. When a frameworks accepts offered resources, it passes to Mesos a description of the tasks it wants to run on them. In turn, Mesos launches the tasks on the corresponding slaves.
Example of resource offer
The figure below shows an example of how a framework gets scheduled to run a task.
Let's walk through the events in the figure.
- Slave 1 reports to the master that it has 4 CPUs and 4 GB of memory free. The master then invokes the allocation policy module, which tells it that framework 1 should be offered all available resources.
- The master sends a resource offer describing what is available on slave 1 to framework 1.
- The framework's scheduler replies to the master with information about two tasks to run on the slave, using <2 CPUs, 1 GB RAM> for the first task, and <1 CPUs, 2 GB RAM> for the second task.
- Finally, the master sends the tasks to the slave, which allocates appropriate resources to the framework's executor, which in turn launches the two tasks (depicted with dotted-line borders in the figure). Because 1 CPU and 1 GB of RAM are still unallocated, the allocation module may now offer them to framework 2.
In addition, this resource offer process repeats when tasks finish and new resources become free.
While the thin interface provided by Mesos allows it to scale and allows the frameworks to evolve independently, one question remains: how can the constraints of a framework be satisfied without Mesos knowing about these constraints? For example, how can a framework achieve data locality without Mesos knowing which nodes store the data required by the framework? Mesos answers these questions by simply giving frameworks the ability to reject offers. A framework will reject the offers that do not satisfy its constraints and accept the ones that do. In particular, we have found that a simple policy called delay scheduling, in which frameworks wait for a limited time to acquire nodes storing the input data, yields nearly optimal data locality.
You can also read much more about the Mesos architecture in this technical paper.