In addition to improvements of existing features, this release of HDP 2.1 includes the following improvements:
Support for Debian6
Support for SLES11 SP3
Pre-emption -- In situations where a queue has a guaranteed level of cluster resources, but must wait to run applications because other queues are utilizing all of the available resources, pre-emption enables higher-priority applications to "bump" lower-priority applications in the queue, and take the resources they need first. For a full description of how pre-emption works, see the Capacity Scheduler chapter of the Hortonworks System Administration Guide.
