52dcd3b5df
### What changes were proposed in this pull request?
In `TimeSlidingHub.add()` `_deque` will clear then add the pair.
```
if (nodesToAdd >= maxQueueSize) {
// The new node exceed existing sliding list, need to clear all old nodes
// and create a new sliding list
_deque.clear();
_deque.add(Pair.of(currentTimestamp, (N) newNode.clone()));
sumNode = (N) newNode.clone();
return;
}
```
Then when call `BufferStatusHub.avgBytesPerSec()`, `currentNumBytes` can be `> 0` but `getCurrentTimeWindowsInMills` may return 0. Cause the error.
```
public long avgBytesPerSec() {
long currentNumBytes = sum().numBytes();
if (currentNumBytes > 0) {
return currentNumBytes * 1000 / (long) getCurrentTimeWindowsInMills();
}
return 0L;
}
```
### Why are the changes needed?
### Does this PR introduce _any_ user-facing change?
### How was this patch tested?
Closes #1690 from AngersZhuuuu/CELEBORN-777.
Authored-by: Angerszhuuuu <angers.zhu@gmail.com>
Signed-off-by: Angerszhuuuu <angers.zhu@gmail.com>
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