[
https://issues.apache.org/jira/browse/MAPREDUCE-3683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13188957#comment-13188957
]
Arun C Murthy commented on MAPREDUCE-3683:
------------------------------------------
bq. leaf queue doesn't take into account its parents maximum capacity when
calculate its own maximum capacity, instead it seems to use the parents
capacity - I think it should be using the parents absoluteMaximumCapacity.
Good catch. I'll fix this.
However, if the parent's max-capacity is undefined i.e. UNLIMITED (-1), we have
two choices:
# Use the parent's 'current' capacity to compute the max-capacity of the child
at runtime
# Set the child's max-capacity to be UNLIMITED too.
I'm leaning towards (2) since it's simpler and easier to explain to users i.e.
it's more consistent. Otherwise, we run the risk of differing max-capacity (due
to parent's capacity changing) which seems unpredictable and hard to explain to
users/admins.
Thoughts?
----
bq. If the leaf queues maximum-capacity is not configured, then it can use 100%
of the cluster.
That isn't true. It just means there is no max-cap for the child and it can use
as much capacity as the parent queue gets, which might be capped by the
parent/grandparent capacity/max-capacity and so on. This seems like the correct
behaviour. Right?
> Capacity scheduler LeafQueues maximum capacity calculation issues
> -----------------------------------------------------------------
>
> Key: MAPREDUCE-3683
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3683
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.0
> Reporter: Thomas Graves
> Assignee: Arun C Murthy
> Priority: Blocker
>
> In the Capacity scheduler if you configure the queues to be hierarchical
> where you have root -> parent queue -> leaf queue, the leaf queue doesn't
> take into account its parents maximum capacity when calculate its own maximum
> capacity, instead it seems to use the parents capacity. Looking at the code
> its using the parents absoluteCapacity and I think it should be using the
> parents absoluteMaximumCapacity.
> It also seems to only use the parents capacity in the leaf queues max
> capacity calculation when the leaf queue has a max capacity configured. If
> the leaf queues maximum-capacity is not configured, then it can use 100% of
> the cluster.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
