FrankinRUC opened a new pull request #3414:
URL: https://github.com/apache/hadoop/pull/3414
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### Description of PR
Currently the CapacityScheduler uses reservations in order to handle
requests for large containers and the fact there might not currently be enough
space available on a single host. But this algorithm is not suitable for small
cluster which only have very limited resources. So we can add a switch property
in capacity scheduler's configuration to avoid reservation scheduling in these
use cases.
CHANGES:
Add "yarn.scheduler.capacity.reservation.enabled" in capacity scheduler's
configuration.
### How was this patch tested?
Add a unit test for switch in
resourcemanager.scheduler.capacity.TestReservations
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [ ] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [ ] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
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