aajisaka commented on PR #5002:
URL: https://github.com/apache/hadoop/pull/5002#issuecomment-1290507496
> But I have a little different through. Maybe the Map<String, MetricsSink>
allSinks is only used to store the registered MetricsSink and sinks is used to
store all the MetricsSinkAdapter.
Good point. I suppose we can simplify `allSinks` because it's only used to
avoid duplicate sink names. `Set<String>` maybe sufficient instead of
`Map<String, MetricsSink>`.
```
if (allSinks.containsKey(name)) {
LOG.warn("Sink "+ name +" already exists!");
return sink;
}
```
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