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mesos

how much resource reserved on a mesos-slave

How does mesos-slave calculate its available resources. In web-ui, mesos-master shows 2.9G memory available on a slave, but I run "free -m":

free -m
             total       used       free     shared    buffers     cached
Mem:          3953       2391       1562          0       1158        771
-/+ buffers/cache:        461       3491
Swap:         4095         43       4052

and --resource parameter was not given. I want to know how does mesos scheduler calculate resources available.

Solution

  • The function that calculates available resources that are offered by slaves can be seen here, in particular, the memory part is lines 98 to 114.

    If the machine has more than 2GB of RAM Mesos will offer total - Gigabytes(1). In your case the machine has ~4GB, and that's why you're seeing ~3GB in the Web UI.