Cluster Reserves

Summary: Build on the resource container work to allocate resources
across a cluster of nodes.

Main points:

* Static resource partitioning--either at the node granularity or
  using resource containers--can only guarantee isolation in the face
  of a static (constant-rate) request load.

* This condition can be violated when clusters are geographically
  distributed; request loads are bursty; or when requests are routed
  based on content.

* The authors describe a scheme for dynamically adjusting resource
  allotments based on current load.

Comments:

* Only CPU time is considered.  Is this appropriate?  Cluster reserves
  are limited by the extent of resource containers (no control over
  disk or network bandwidth, for example).