jonvex opened a new pull request, #9468:
URL: https://github.com/apache/hudi/pull/9468

   ### Change Logs
   
   If two cleans start at nearly the same time, they will both attempt to 
execute the same clean instances. This does not cause any data corruption, but 
will cause a writer to fail when they attempt to create the commit in the 
timeline. This is because the commit will have already been written by the 
first writer. Now, we check the timeline before transitioning state.
   
   ### Impact
   
   No writers will fail in this scenario now
   
   ### Risk level (write none, low medium or high below)
   
   low
   
   ### Documentation Update
   
   N/A
   
   ### Contributor's checklist
   
   - [ ] Read through [contributor's 
guide](https://hudi.apache.org/contribute/how-to-contribute)
   - [ ] Change Logs and Impact were stated clearly
   - [ ] Adequate tests were added if applicable
   - [ ] CI passed
   


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