poorbarcode opened a new pull request, #18362:
URL: https://github.com/apache/pulsar/pull/18362

   Fixes #16729
   
   ### Motivation
   
   same as #18310
   
   `ManagedCursorImpl` has a known problem: when the `cursor.close` and the 
`cursor.switchLedger` are concurrent executing, a bad version exception is 
thrown. see: 
   
   
https://github.com/apache/pulsar/blob/0c3c175eb132d4ef0fb3a12842127dcb4fa1933d/managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedCursorImpl.java#L2595-L2619
   
   ### Modifications
   
   - `managedLedger.close` triggers the `cursor.close`, so remove code 
`cursor.close`
   - if `managedLedger.close` fail, just retry, it will be ok
   
   ### Documentation
   
   <!-- DO NOT REMOVE THIS SECTION. CHECK THE PROPER BOX ONLY. -->
   
   - [ ] `doc` <!-- Your PR contains doc changes. Please attach the local 
preview screenshots (run `sh start.sh` at `pulsar/site2/website`) to your PR 
description, or else your PR might not get merged. -->
   - [ ] `doc-required` <!-- Your PR changes impact docs and you will update 
later -->
   - [x] `doc-not-needed` <!-- Your PR changes do not impact docs -->
   - [ ] `doc-complete` <!-- Docs have been already added -->
   
   ### Matching PR in forked repository
   
   PR in forked repository: 
   
   - https://github.com/poorbarcode/pulsar/pull/38


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