weisong44 opened a new pull request, #7447:
URL: https://github.com/apache/hadoop/pull/7447
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### Description of PR
In our environment, we aren't able to rely on data locality due to various
reasons, overall the current implementation of sorting by network distance
didn't improve overall performance, it also caused unnecessary concentration of
load on specific datanodes. We would like to request for a random policy that
randomly order datanodes, we expect this policy to improve load distribution.
The new policy should be configurable, and it is disabled. When enabled, it
replaces the current network topology based datanode ordering.
### How was this patch tested?
Unit test & mvn clean install
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')? See subject
- [ ] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation? N/A
- [ ] 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)? N/A
- [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files? N/A
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