clolov commented on PR #13421:
URL: https://github.com/apache/kafka/pull/13421#issuecomment-1586953389

   Heya @viktorsomogyi! I believe it is reasonable to resume compaction if B 
has failed. Until the copy on B for partition X-1 is done the source of truth 
for that partition is whatever is on A. I think that B should have a mechanism 
to figure out how much of X-1 it has successfully copied once it comes back up 
online (if ever) and initiate the process from that point in time and asking A 
to pause again.
   
   If not, how will we ever resume compaction on A if B has failed 
irrecoverably?


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