Attributes

Attributes are used to describe certain additional information regarding the slave node, such as its OS version, whether it has a particular type of hardware, and so on. They are expressed as key-value pairs with support for three different value types—scalar, range, and text—that are sent along with the offers to frameworks. Take a look at the following code:

attributes : attribute ( ";" attribute )*

attribute : text ":" ( scalar | range | text )

Resources

Mesos can manage three different types of resources: scalars, ranges, and sets. These are used to represent the different resources that a Mesos slave has to offer. For example, a scalar resource type could be used to represent the amount of CPU on a slave. Each resource is identified by a key string, as follows:

resources : resource ( ";" resource )*

resource : key ":" ( scalar | range | set )

key : text ( "(" resourceRole ")" )?

resourceRole : text | "*"

Predefined uses and conventions

The Mesos master predefines how it handles the following list of resources:

In particular, a slave without the cpu and mem resources will never have its resources advertised to any frameworks. Also, the master's user interface interprets the scalars in mem and disk in terms of MB. For example, the value 15000 is displayed as 14.65GB.