Apache Mesos Essentials by Kakadia Dharmesh

Author:Kakadia, Dharmesh
Language: eng
Format: epub, azw3
Publisher: Packt Publishing
Published: 2015-06-29T04:00:00+00:00

Because of this design, Mesos is also known as a two-level scheduler. Mesos' two-level scheduler design makes it simpler and more scalable, as the resource allocation process does not need to know how scheduling happens. This makes the Mesos core more stable and scalable. Frameworks and Mesos are not tied to each other and each can iterate independently. Also, this makes porting frameworks easier, as we will see in the next chapter.

The choice of a two-level scheduler means that the scheduler does not have a global knowledge about resource utilization and the resource allocation decisions can be nonoptimal. One potential concern could be about the preferences that the frameworks have about the kind of resources needed for execution. Data locality, special hardware, and security constraints can be a few of the constraints on which tasks can run. In the Mesos realm, these preferences are not explicitly specified by a framework to the Mesos master, instead the framework rejects all the offers that do not meet its constraints.

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