[GitHub] [hadoop] zhangshuyan0 commented on pull request #5330: HDFS-16898. Make write lock fine-grain in method processCommandFromActor

["zhangshuyan0 (via GitHub)" <gi...@apache.org>]

zhangshuyan0 commented on PR #5330:
URL: https://github.com/apache/hadoop/pull/5330#issuecomment-1418437375

   It is great to prevent the heartbeat from being affected by command processing. I checked that processCommandFromXXX() doesn't access any members inside BPOfferService that can be changed. 
   The only thing to note is that in the original code, after the switchover, the new ANN can guarantee that the DN will not execute the commands from the old ANN as long as it receives two heartbeats from the DN. After the function is placed outside the lock, this guarantee no longer exists. However, as @hfutatzhanghb  said, NN will set the DataNode to stale after the switchover, which means that NN does not rely on this guarantee. So, I think this patch is safe.
   


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