devinbost opened a new pull request #10583:
URL: https://github.com/apache/pulsar/pull/10583


   I noticed that OpAddEntry.safeRun() is modifying a volatile field 
(`ml.lastConfirmedEntry`) here: 
https://github.com/apache/pulsar/blob/55d6a77ec8e7d05f00f906111b7de63d6b52c74a/managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/OpAddEntry.java#L197
   Since we don't have a mutex while updating `lastConfirmedEntry`, it looks 
like that could create a concurrency issue if another thread races on the 
update. 
   I found this while investigating #6054, though testing confirmed that this 
PR doesn't prevent the `lastConfirmedEntry` from getting stuck in that issue 
(as reported in this comment: 
https://github.com/apache/pulsar/issues/6054#issuecomment-840894974).


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