tree 06001f047c67bf469dc0d2450205c761368c07f0
parent 4b7facf49b1ef166f21ccd1b3aea37d482900313
author congbo <39078850+congbobo184@users.noreply.github.com> 1617265080 +0800
committer GitHub <noreply@github.com> 1617265080 +0800
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[Broker] Fix NonDurableCursorImpl initialPosition by startCursorPosition greater than lastConfirmedEntry problem. (#10095)

## Motivation
In order to fix reader set ```startMessageId``` greater than ```lastConfirmedEntry``` probelm.

When the reader set ```startMessageId``` greater than ```lastConfirmedEntry```, generate ```NonDurableCursorImpl``` will carry a ```MarkdeletePosition``` greater than lastConfirmedEntry.
When use ```getNumberOfEntriesInBacklog``` will throw 
![image](https://user-images.githubusercontent.com/39078850/113100735-5f4d8980-922e-11eb-8758-7d3cfb1435f3.png)


## implement
When ```startMessageId``` greater than ```lastConfirmedEntry``` use ```lastConfirmedEntry``` as ```markdeletePosition```
### Verifying this change
Add the tests for it

Does this pull request potentially affect one of the following parts:
If yes was chosen, please highlight the changes

Dependencies (does it add or upgrade a dependency): (no)
The public API: (no)
The schema: (no)
The default values of configurations: (no)
The wire protocol: (no)
The rest endpoints: (no)
The admin cli options: (no)
Anything that affects deployment: (no)