klsince opened a new pull request #7301:
URL: https://github.com/apache/pinot/pull/7301


   ## Description
   This one is core implementation for 
https://github.com/apache/pinot/pull/7286. This PR does index cleanup for V3 
segment format (V1 already has this feature). 
   
   The general idea to clean up indices for V3 consists of two steps: mark and 
sweep. Calling removeIndex() marks the indices to be removed; sweep happens in 
close() method of SingleFileIndexDirectory. The index creation handlers are 
supposed to call removeIndex() by comparing local indices and those set in 
table config (adding these changes in next PR).
   
   No failure handling during sweep. It's expected to be called during segment 
reloading, which actually has failure handling (in short, by creating a backup 
folder before doing reloading, and restore with the backup folder upon any 
failure).
   
   ## Upgrade Notes
   Does this PR prevent a zero down-time upgrade? (Assume upgrade order: 
Controller, Broker, Server, Minion)
   * [ ] Yes (Please label as **<code>backward-incompat</code>**, and complete 
the section below on Release Notes)
   
   Does this PR fix a zero-downtime upgrade introduced earlier?
   * [ ] Yes (Please label this as **<code>backward-incompat</code>**, and 
complete the section below on Release Notes)
   
   Does this PR otherwise need attention when creating release notes? Things to 
consider:
   - New configuration options
   - Deprecation of configurations
   - Signature changes to public methods/interfaces
   - New plugins added or old plugins removed
   * [ ] Yes (Please label this PR as **<code>release-notes</code>** and 
complete the section on Release Notes)
   ## Release Notes
   <!-- If you have tagged this as either backward-incompat or release-notes,
   you MUST add text here that you would like to see appear in release notes of 
the
   next release. -->
   
   <!-- If you have a series of commits adding or enabling a feature, then
   add this section only in final commit that marks the feature completed.
   Refer to earlier release notes to see examples of text.
   -->
   ## Documentation
   <!-- If you have introduced a new feature or configuration, please add it to 
the documentation as well.
   See 
https://docs.pinot.apache.org/developers/developers-and-contributors/update-document
   -->
   


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