[GitHub] [incubator-druid] FaxianZhao opened a new pull request #8598: bug fix for lookup leak when we remove the last lookup from lookup tier

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FaxianZhao opened a new pull request #8598: bug fix for lookup leak when we remove the last lookup from lookup tier
URL: https://github.com/apache/incubator-druid/pull/8598
 
 
   Fixes bug which caused by #7852.
   
   ### Description
   
   #### Fixed the bug ...
   Due to #7852, coordinator won't tell other node to dispose lookup when we remove the last lookup from a tier.
   #### Renamed the class ...
   #### Added a forbidden-apis entry ...
   
   <hr>
   
   This PR has:
   - [x] been self-reviewed.
   - [ ] added documentation for new or modified features or behaviors.
   - [ ] added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
   - [ ] added or updated version, license, or notice information in [licenses.yaml](https://github.com/apache/incubator-druid/blob/master/licenses.yaml)
   - [ ] added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
   - [ ] added unit tests or modified existing tests to cover new code paths.
   - [ ] added integration tests.
   - [x] been tested in a test Druid cluster.
   
   <hr>
   
   ##### Key changed/added classes in this PR
    * `LookupCoordinatorManager`
   

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