Chung-En Lee created HDDS-15931:
-----------------------------------
Summary: Remove usage of internal netty metrics
Key: HDDS-15931
URL: https://issues.apache.org/jira/browse/HDDS-15931
Project: Apache Ozone
Issue Type: Sub-task
Reporter: Chung-En Lee
It would be better to not use netty internal `maxDirectMemory` and
`usedDirectMemory` in NettyMetrics#getMetrics.
`usedDirectMemory` can be replaced by netty public api. For example:
```
public long getUsedDirectMemory() {
ByteBufAllocator allocator = ByteBufAllocator.DEFAULT; // 或使用專案中自訂的 Allocator
if (allocator instanceof ByteBufAllocatorMetricProvider) {
ByteBufAllocatorMetric metric = ((ByteBufAllocatorMetricProvider)
allocator).metric();
return metric.usedDirectMemory(); // 公開 API
}
return -1L;
}
```
`maxDirectMemory` depends on system property and jvm setting.
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