coderzc opened a new pull request, #18172:
URL: https://github.com/apache/pulsar/pull/18172

   ### Motivation
   
   In the current implementation, the `getChildren` will return incorrect 
results when getting children paths of `/` and some special path in 
`MemoryMetadataStore` and `EtcdMetadataStore`, because we use `replace` lead to 
the `basePath` has been replaced many times.
   
   ### Modifications
   
   Use `replace` instead of `replaceFirst`.
   
   ### Verifying this change
   
   - [x] Make sure that the change passes the CI checks.
   
   This change is already covered by existing tests, such as *testGetChildren*.
   
   ### 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/coderzc/pulsar/pull/16


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