Yikun commented on PR #37399:
URL: https://github.com/apache/spark/pull/37399#issuecomment-1204698781

   @dongjoon-hyun @HyukjinKwon Thanks, I do a local test in my repo all works 
well!
   
   I also take a deep look on why cache not working: the `ubuntu:20.04` hash 
changes 
[before](https://github.com/apache/spark/runs/7552458947?check_suite_focus=true#step:7:115)
 and 
[after](https://github.com/apache/spark/runs/7653584220?check_suite_focus=true#step:7:118)
 cache outdate. (`FROM` is a specific case in docker registry cache, it's not 
based on static text cache)
   
   There might some improvement in followup:
   - https://github.com/apache/spark/pull/37402 Add separate image tag to help 
debug and recover CI if needed.
   - Pin to ubuntu:20.04 to static hash, and only change it when upgrade the 
hash when manully 


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