[jira] [Created] (ZOOKEEPER-4785) Txn loss due to race condition when follower DIFF sync with leader

[Li Wang (Jira)]

Li Wang created ZOOKEEPER-4785:
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             Summary: Txn loss due to race condition when follower DIFF sync 
with leader
                 Key: ZOOKEEPER-4785
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4785
             Project: ZooKeeper
          Issue Type: Bug
          Components: server
    Affects Versions: 3.9.1, 3.8.2, 3.7.2, 3.8.1, 3.7.1, 3.8.0
            Reporter: Li Wang


We had txn loss incident in production recently. The root cause is follower 
writes the current epoch and sends the ACK_LD before successfully persisting 
all the txns from DIFF sync, as persisting txns is handled asynchronously via 
SyncRequestProcessor.






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