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Posted to issues@bookkeeper.apache.org by GitBox <gi...@apache.org> on 2022/06/14 06:46:51 UTC

[GitHub] [bookkeeper] horizonzy commented on pull request #1077: ISSUE #1067: PendingReadOp: recovery, return NoSuchEntry on wQ-aQ+1 errors

horizonzy commented on PR #1077:
URL: https://github.com/apache/bookkeeper/pull/1077#issuecomment-1154782744

   @athanatos Hi, I have a question about this change.
   E:3 WQ:3 AQ:3.
   
   `Ledger 1` exist at three bookie.
   Bookie1: lac-12
   Bookie2: lac-11
   Bookie3: lac-11
   
   When client try to recover ledger 1. It will read entry from three bookies. There are two situation which will cause different result.
   
   1. Client read bookie2 `entry 12`, got NoSuchEntry failed. Then read bookie3 `entry 12`, got NoSuchEntry failed again. It reach `requiredBookiesMissingEntryForRecovery`, end recovery. `Ledger 1` lac is 11 finally.
   2. Client read bookie1 `entry12` succeed.  RecoverAddEntry to bookie2 and bookie3. Then read `entry 13`, all bookie NoSuchEntry failed, end recovery. `Ledger 1` lac is 12 finally.
   
   
   The order of client `RecoveryReadOp` send to bookie will cause different result. 


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