symious opened a new pull request #3704:
URL: https://github.com/apache/hadoop/pull/3704
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### Description of PR
In HDFS-16320, the DataNode can retrieve the SLOW status from each NameNode.
This ticket is to send this information back to Clients who are writing
blocks. If a Clients noticed the pipeline is build on a slownode, he/she can
choose to mark the slownode as a badnode to exclude the node or rebuild a
pipeline.
In order to avoid the false positives, we added a config of "threshold",
only clients continuously receives slownode reply from the same node will the
node be marked as SLOW.
Jira ticket: https://issues.apache.org/jira/browse/HDFS-16348
### How was this patch tested?
unit test
### 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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