MENG DING created YARN-4080:
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Summary: Capacity planning for long running services on YARN
Key: YARN-4080
URL: https://issues.apache.org/jira/browse/YARN-4080
Project: Hadoop YARN
Issue Type: Improvement
Components: api, resourcemanager
Reporter: MENG DING
YARN-1197 addresses the functionality of container resource resize. One major
use case of this feature is for long running services managed by Slider to
dynamically flex up and down resource allocation of individual components
(e.g., HBase region server), based on application metrics/alerts obtained
through third-party monitoring and policy engine.
One key issue with increasing container resource at any point of time is that
the additional resource needed by the application component may not be
available *on the specific node*. In this case, we need to rely on preemption
logic to reclaim the required resource back from other (preemptable)
applications running on the same node. But this may not be possible today
because:
* preemption doesn't consider constraints of pending resource requests, such as
hard locality requirements, user limits, etc (being addressed in YARN-2154 and
possibly in YARN-3769?)
* there may not be any preemptable container available due to the fact that no
application is over its guaranteed capacity.
What we need, ideally, is a way for YARN to support future capacity planning of
long running services. At the minimum, we need to provide a way to let YARN
know about the resource usage prediction/pattern of a long running service. And
given this knowledge, YARN should be able to preempt resources from other
applications to accommodate the resource needs of the long running service.
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