vsly-ru commented on issue #6995:
URL: https://github.com/apache/pulsar/issues/6995#issuecomment-899094102


   @lukestephenson luckily we have only one producer per compacted topic at a 
time.
   In case of multiple producers you indeed need some kind of lock or service 
time to perform the migration. I've also heard a _hack_ to enable retention and 
run a cron job to _touch_ every key with the last value. However it also 
requires a lock. 
   
    @merlimat wow, great news! Sounds like exactly what we need!


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