heesung-sn opened a new pull request, #15692:
URL: https://github.com/apache/pulsar/pull/15692
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### Motivation
We have the following error from websocket service when running different
GCs other than G1GC. This is because websocket uses its own
`org.apache.pulsar.websocket.stats.JvmMetrics` class, which always looks up
G1GC stats, regardless of the runtime GC. I think we can replace this
duplicated `org.apache.pulsar.websocket.stats.JvmMetrics` with the common one
`org.apache.pulsar.common.stats.JvmMetrics`, which supports different GC
metrics.
```
2022-05-20T10:54:29,322-0700 [pulsar-websocket-57-2] ERROR
org.apache.pulsar.websocket.stats.JvmMetrics - Failed to collect GC stats:
java.lang:type=GarbageCollector,name=G1 Young Generation
```
### Modifications
- Removed `org.apache.pulsar.websocket.stats.JvmMetrics`
- Replaced `org.apache.pulsar.websocket.stats.JvmMetrics` dependency with
`org.apache.pulsar.common.stats.JvmMetrics` in `ProxyStats`.
#### Behavior changes
Before
```
### when running websocket on G1GC
curl http://localhost:8080/admin/v2/proxy-stats/metrics/
[{"metrics":{
"jvm_gc_old_count":0,
"jvm_gc_old_pause":0,
"jvm_gc_young_count":0,
"jvm_gc_young_pause":0,
"jvm_heap_used":52622168,
"jvm_max_direct_memory":4294967296,
"jvm_max_memory":2147483648,
"jvm_thread_cnt":24,
"jvm_total_memory":2147483648},
"dimensions":{"system":"jvm"}}]
### when running websocket on ZGC
websocket.stats.JvmMetrics constantly fails to collect G1GC metrics and
throws the error.
2022-05-20T15:26:00,499-0700 [pulsar-websocket-2-1] ERROR
org.apache.pulsar.websocket.stats.JvmMetrics - Failed to collect GC stats:
java.lang:type=GarbageCollector,name=G1 Young Generation
...
curl http://localhost:8080/admin/v2/proxy-stats/metrics/
[{"metrics":{
"jvm_gc_old_count":0,
"jvm_gc_old_pause":0,
"jvm_gc_young_count":0,
"jvm_gc_young_pause":0,
"jvm_heap_used":117440512,
"jvm_max_direct_memory":4294967296,
"jvm_max_memory":2147483648,
"jvm_thread_cnt":24,
"jvm_total_memory":2147483648},
"dimensions":{"system":"jvm"}}]
```
After
```
### when running websocket on G1GC
curl http://localhost:8080/admin/v2/proxy-stats/metrics/
[{"metrics":{
"jvm_direct_memory_used":0,
"jvm_gc_old_count":0,
"jvm_gc_old_pause":0,
"jvm_gc_young_count":0,
"jvm_gc_young_pause":0,
"jvm_heap_used":58425032,
"jvm_max_direct_memory":4294967296,
"jvm_max_memory":2147483648,
"jvm_thread_cnt":28,
"jvm_total_memory":2147483648,
"prx_default_pool_allocated":0,
"prx_default_pool_used":0},
"dimensions":{"metric":"jvm_metrics"}}]
### when running websocket on ZGC
curl http://localhost:8080/admin/v2/proxy-stats/metrics/
[{"metrics":{
"jvm_ZGC Cycles_gc_count":0,
"jvm_ZGC Cycles_gc_pause":0,
"jvm_ZGC Pauses_gc_count":0,
"jvm_ZGC Pauses_gc_pause":0,
"jvm_direct_memory_used":0,
"jvm_full_gc_count":1,
"jvm_full_gc_pause":0,
"jvm_heap_used":117440512,
"jvm_max_direct_memory":4294967296,
"jvm_max_memory":2147483648,
"jvm_thread_cnt":24,
"jvm_total_memory":2147483648,
"prx_default_pool_allocated":0,
"prx_default_pool_used":0},
"dimensions":{"metric":"jvm_metrics"}}]
```
### Verifying this change
- [x] Make sure that the change passes the CI checks.
This change is a trivial rework / code cleanup without any test coverage.
### 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): (yes / **no**)
- The public API: (yes / **no**)
- The schema: (yes / **no** / don't know)
- The default values of configurations: (yes / **no**)
- The wire protocol: (yes / **no**)
- The rest endpoints: (yes / **no**)
- The admin cli options: (yes / **no**)
- Anything that affects deployment: (yes / **no** / don't know)
### Documentation
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