yaooqinn opened a new pull request #841:
URL: https://github.com/apache/incubator-kyuubi/pull/841
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### _Why are the changes needed?_
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#### Kyuubi Spark External Shuffle Service
This enables the missing feature of Dynamic Resource Allocation(a.k.a, DRA,
DA) for running Spark on Kubernetes, which provides the auto-scaling capability
for Spark application, especially downscaling.
Although there is a feature called shuffle tracking to track the shuffle
data and tell Spark to remove executor while the data exceeds the time to live,
these removals are coarse-grained.
##### Prerequisites
- Everything you need to know about Spark on Kubernetes
- Running Spark on Kubernetes apps with hostNetwork enabled
- Running this module as a DaemonSet with hostNetwork enabled
- Self-managed shuffle data cleaner as the state of apps will not be posted
to this service
- See: tools/spark-block-cleaner/kubernetes/spark-block-cleaner.yml
##### Usage
Check `tools/kyuubi-shuffle-service/kubernetes/example.yaml` for more
information.
### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including
negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [ ] [Run
test](https://kyuubi.readthedocs.io/en/latest/tools/testing.html#running-tests)
locally before make a pull request
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