tjiuming opened a new pull request #14453:
URL: https://github.com/apache/pulsar/pull/14453
### Motivation
1. Avoid more than once `PrometheusMetricsGenerator#generate` invoke in a
period(1 minute), for the purpose of saving memory and reducing CPU usage.
2. Persist metrics data into file and send to client by jetty's `send_file`.
Avoid huge heap memory allocations, too much `mem_copy` operations, too much
memory resizes, high GC pressure and high CPU usage.
### Modifications
1. Using sliding window in `PrometheusMetricsGenerator#generate`, invoke
`PrometheusMetricsGenerator#generate` once in a period, cache the result and
return to client directly.
2. Persist metrics data into temp file, send it to client by `send_file`.
3. Delete temp files when JVM exits.
### Does this pull request potentially affect one of the following parts:
*If `yes` was chosen, please highlight the changes*
- Dependencies (does it add or upgrade a dependency): (no)
- The public API: (no)
- The schema: (no)
- The default values of configurations: (no)
- The wire protocol: (no)
- The rest endpoints: (no)
- The admin cli options: (no)
- Anything that affects deployment: (no)
### Documentation
Check the box below or label this PR directly (if you have committer
privilege).
Need to update docs?
- [ ] `doc-required`
(If you need help on updating docs, create a doc issue)
- [x] `no-need-doc`
(Please explain why)
- [ ] `doc`
(If this PR contains doc changes)
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