[backport to v1.40.x] retry changes: retry stats impl, bug fix, enable retry by default #8406
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There has been an issue about flow control when retry is enabled.
Currently we call `masterListener.onReady()` whenever `substreamListener.onReady()` is called.
The user's `onReady()` implementation might do
```
while(observer.isReady()) {
// send one more message.
}
```
However, currently if the `RetriableStream` is still draining, `isReady()` is false, and user's `onReady()` exits immediately. And because `substreamListener.onReady()` is already called, it may not be called again after drained.
This PR fixes the issue by
- Use a SerializeExecutor to call all `masterListener` callbacks.
- Once `RetriableStream` is drained, check `isReady()` and if so call `onReady()`.
- Once `substreamListener.onReady()` is called, check `isReady()` and only if so we call `masterListener.onReady()`.
Stabilize `enableRetry()` and `disableRetry()`. Disable retry in `ManagedChannelImplTest` because each call attempt will fork the headers to a new instance, and add a ClientStreamTracer.Factory for bufferSizeLimit in CallOptions, which makes verification not straightforward.
ejona86
approved these changes
Aug 12, 2021
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This backports
#8403 xds: enable xDS retry by default
#8402 core: enable retry by default
#8401 core: fix retry flow control issue
#8362 all: implement retry stats
to v1.40.x