wilfred-s commented on a change in pull request #175:
URL:
https://github.com/apache/incubator-yunikorn-core/pull/175#discussion_r444294598
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File path: docs/sorting_policy.md
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@@ -143,8 +143,45 @@ This results in a node with the highest utilisation to be
considered first for a
Resulting in a high(er) utilisation of a small(er) number of nodes, better
suited for cloud deployments.
## Request sorting
-There is currently one policy for sorting requests within an application.
-This policy is not configurable.
-Sorting requests is only possible based on the priority of the request.
-If there are multiple requests within an application that have the same
priority the order of the requests is undetermined.
-This means that the order of requests with the same priority can, and most
likely will, change between runs.
\ No newline at end of file
+There are currently two policies for sorting requests within an application.
+A request is an ask from an application which maps to one or more pods or
containers.
+The policy is not set directly on the application but inherited from the
queue.
+A sorting policy setting is only effective on a `leaf` queue.
+Each `leaf` queue can use a different policy.
+
+Requests are sorted but this is not a guarantee that a newer request will not
be allocated before an older request.
+There might be cases that a request cannot be allocated immediately.
+In that case is a newer request might be allocated before an older request
(i.e. a reservation for an old request).
+
+The following configuration entry sets the request sorting policy to
`priority` for the queue `root.sandbox`:
+```yaml
+partitions:
+ - name: default
+ queues:
+ - name: root
+ queues:
+ - name: sandbox
+ properties:
+ request.sort.policy: priority
+```
+
+### FifoSortPolicy
+Short description: first in first out, based on application create time
+Config value: fifo (default)
+Behaviour:
+Before sorting the requests are filtered and must have pending asks.
Review comment:
fixed, added extra explanation around requests and repeats (removed ask
ref)
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