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From "Adam B (JIRA)" <>
Subject [jira] [Updated] (MESOS-2018) Dynamic Reservation
Date Sun, 21 Jun 2015 07:38:00 GMT


Adam B updated MESOS-2018:
    Priority: Critical  (was: Major)

> Dynamic Reservation
> -------------------
>                 Key: MESOS-2018
>                 URL:
>             Project: Mesos
>          Issue Type: Epic
>          Components: allocation, framework, master, slave
>            Reporter: Adam B
>            Assignee: Michael Park
>            Priority: Critical
>              Labels: mesosphere, offer, persistence, reservations, resource, stateful,
> h3. Overview
> This is a feature to provide better support for running stateful services on Mesos such
as HDFS (Distributed Filesystem), Cassandra (Distributed Database), or MySQL (Local Database).
> Current resource reservations (henceforth called "static" reservations) are statically
determined by the slave operator at slave start time, and individual frameworks have no authority
to reserve resources themselves.
> Dynamic reservations allow a framework to dynamically reserve offered resources, such
that those resources will only be re-offered to the same framework (or other frameworks with
the same role).
> This is especially useful if the framework's task stored some state on the slave, and
needs a guaranteed set of resources reserved so that it can re-launch a task on the same slave
to recover that state.
> h3. Planned Stages
> 1. MESOS-2489: Enable a framework to perform reservation operations.
> The goal of this stage is to allow the framework to send back a Reserve/Unreserve operation
which gets validated by the master and updates the allocator resources. The allocator's {{allocate}}
logic is left unchanged and the resources get offered back to the framework's role as desired.
> 2. MESOS-2491: Persist the reservation state on the slave.
> The goal of this stage is to persist the reservation state on the slave. Currently the
master knows to store the persistent volumes in the {{checkpointedResources}} data structure
which gets sent to individual slaves to be checkpointed. We will update the master such that
dynamically reserved resources are stored in the {{checkpointedResources}} as well. This stage
also involves subtasks such as updating the slave re(register) logic to support slave re-starts.
> 3. MESOS-2600: Introduce reservation HTTP endpoints on the master.
> The goal of this stage is to enable operators to perform reservation operations via HTTP
endpoints on the master.

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