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https://issues.apache.org/jira/browse/YARN-6599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16319662#comment-16319662
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Wangda Tan commented on YARN-6599:
----------------------------------
Discussed with [~asuresh] and [~kkaranasos] today, a summary of what we
discussed.
1) To support check cardinality for intra-app/inter-app. We will reuse the
TargetExpression.targetKey to specify application label. Application label is a
new concept which could be:
- {{APPLICATION_LABEL/SELF}}: to check cardinality within the app.
- {{APPLICATION_LABEL/<APPLICATION_ID>}}: to check cardinality under app with
given app id.
- {{APPLICATION_LABEL/<LABEL>}}: to check cardinality under app with given
label.
What we will immediately add is {{APPLICATION_LABEL/SELF}}, and move all other
staffs to future when we want to do cross-application affinity/anti-affinity.
2) SELF target-type will be removed in YARN-7709. Application needs to copy
source tags to target tags when wants to affinity/anti-affinity to itself.
3) Will keep node partition related logic in the patch for reviews. In the
future after YARN-3409, we need to add all node-related properties to node
attributes, such as {{yarn.io/host.name/<host-name>}},
{{yarn.io.failure.domain/<domain-name>}},
{{yarn.io.node.partition/<partition-name>}}. Reason of doing this is, we can
support all node related attribute in the same logic, no need to do if checks
like:
{code}
if (targetKey == node_partition) {
// check node.getPartition
}
{code}
4) Since we have two approaches:
- Placement processor. (Added by YARN-7612)
- AppPlacementAllocator for SchedulingRequest (added by this patch).
Both approaches have merits, the first one can consider
multiple-apps/multiple-scheduling-requests at the same time. And the latter one
keeps same scheduler behavior and support features like node partition,
allocation order under different
priority/allocation-id/app-priority/queue-order etc.
Since the whole scheduling request is a new feature, we will include two
configs:
a. Enable placement processor (YARN-7612 already includes configs)
b. Enable scheduling request handled by app placement allocator.
Both a/b are disabled by default and cannot be enabled at the same time.
An alternative solution is to have one config which supports enum values like
processor/scheduler. (we need a better name for this). Thoughts here?
5) For Scheduler allocate interface, we will stick to approach introduced by
this patch. Extracting a common class for SchedulerRequest/ResourceRequest
cannot simplify the problem and might introduce compatibility issues.
[~asuresh]/[~kkaranasos], please add if any missed/inaccurate.
> Support rich placement constraints in scheduler
> -----------------------------------------------
>
> Key: YARN-6599
> URL: https://issues.apache.org/jira/browse/YARN-6599
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Wangda Tan
> Assignee: Wangda Tan
> Attachments: YARN-6599-YARN-6592.003.patch,
> YARN-6599-YARN-6592.004.patch, YARN-6599-YARN-6592.005.patch,
> YARN-6599-YARN-6592.006.patch, YARN-6599-YARN-6592.007.patch,
> YARN-6599-YARN-6592.008.patch, YARN-6599-YARN-6592.wip.002.patch,
> YARN-6599.poc.001.patch
>
>
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