eubnara opened a new pull request, #8106:
URL: https://github.com/apache/hadoop/pull/8106
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### Description of PR
There are some points to improve the performance of YARN Registry DNS Server.
- Do not print unnecessary logs (It just needs change log4j.properties)
- log4j.logger.org.apache.hadoop.registry.server.dns=WARN
- Change some loglevels at points which can affect performance degradation.
- Use "newFixedThreadPool" instead of "newCachedThreadPool" to prevent OOM
- Use Blocking on TCP handler. Using non-blocking and sleeping some
time("Thread.sleep(500)") is meaningless.
In our environment, QPS of original yarn dns server is about 5000 (UDP), 100
(TCP).
Now, QPS of our improved yarn dns server is about 47000 (UDP), 500 (TCP).
I will make a pull request at https://github.com/apache/hadoop soon.
### How was this patch tested?
Our team members have tested this manually in our cluster.
### 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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