dlg99 opened a new pull request, #4152:
URL: https://github.com/apache/bookkeeper/pull/4152
### Motivation
FastTimer returns zero rate if reate call happens immediately after the
first timer update. E.g. this test would fail:
```java
FastTimer t = new FastTimer();
t.update(10, TimeUnit.NANOSECONDS);
assertTrue("should calculate mean before advancing time",
t.getMeanRate() > 0);
```
### Changes
Fixed + added a test
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