zhaizhibo opened a new pull request, #4660:
URL: https://github.com/apache/bookkeeper/pull/4660

   fix [4651](https://github.com/apache/bookkeeper/issues/4651)
   
   ### Motivation
   **BUG REPORT**
   
   ```
   2025-08-01T17:09:12,274+0800 [BookKeeperClientWorker-OrderedExecutor-11-0] 
INFO  
org.apache.bookkeeper.client.LedgerHandle.lambda$ensembleChangeLoop$12(LedgerHandle.java:2274)
 - New Ensemble: [xxx, xxx] for ledger: 1547399
   2025-08-01T17:09:12,372+0800 [BookKeeperClientWorker-OrderedExecutor-11-0] 
INFO  
org.apache.bookkeeper.client.LedgerHandle.lambda$ensembleChangeLoop$12(LedgerHandle.java:2274)
 - New Ensemble: [xxx, xxx] for ledger: 1547399
   2025-08-01T17:09:14,914+0800 [BookKeeperClientWorker-OrderedExecutor-11-0] 
INFO  
org.apache.bookkeeper.client.LedgerHandle.lambda$ensembleChangeLoop$12(LedgerHandle.java:2274)
 - New Ensemble: [xxx, xxx] for ledger: 1547399
   2025-08-01T17:09:15,114+0800 [BookKeeperClientWorker-OrderedExecutor-11-0] 
INFO  
org.apache.bookkeeper.client.LedgerHandle.lambda$ensembleChangeLoop$12(LedgerHandle.java:2274)
 - New Ensemble: [xxx, xxx] for ledger: 1547399
   2025-08-01T17:09:15,940+0800 [BookKeeperClientWorker-OrderedExecutor-11-0] 
INFO  
org.apache.bookkeeper.client.LedgerHandle.lambda$ensembleChangeLoop$12(LedgerHandle.java:2274)
 - New Ensemble: [xxx, xxx] for ledger: 1547399
   2025-08-01T17:09:16,040+0800 [BookKeeperClientWorker-OrderedExecutor-11-0] 
INFO  
org.apache.bookkeeper.client.LedgerHandle.lambda$ensembleChangeLoop$12(LedgerHandle.java:2274)
 - New Ensemble: [xxx, xxx] for ledger: 1547399
   2025-08-01T17:09:16,103+0800 [BookKeeperClientWorker-OrderedExecutor-11-0] 
INFO  
org.apache.bookkeeper.client.LedgerHandle.lambda$ensembleChangeLoop$12(LedgerHandle.java:2274)
 - New Ensemble: [xxx, xxx] for ledger: 1547399
   2025-08-01T17:09:16,201+0800 [BookKeeperClientWorker-OrderedExecutor-11-0] 
INFO  
org.apache.bookkeeper.client.LedgerHandle.lambda$ensembleChangeLoop$12(LedgerHandle.java:2274)
 - New Ensemble: [xxx, xxx] for ledger: 1547399
   2025-08-01T17:09:16,258+0800 [BookKeeperClientWorker-OrderedExecutor-11-0] 
INFO  
org.apache.bookkeeper.client.LedgerHandle.lambda$ensembleChangeLoop$12(LedgerHandle.java:2274)
 - New Ensemble: [xxx, xxx] for ledger: 1547399
   2025-08-01T17:09:16,369+0800 [BookKeeperClientWorker-OrderedExecutor-11-0] 
INFO  
org.apache.bookkeeper.client.LedgerHandle.lambda$ensembleChangeLoop$12(LedgerHandle.java:2274)
 - New Ensemble: [xxx, xxx] for ledger: 1547399
   2025-08-01T17:09:16,427+0800 [BookKeeperClientWorker-OrderedExecutor-11-0] 
INFO  
org.apache.bookkeeper.client.LedgerHandle.lambda$ensembleChangeLoop$12(LedgerHandle.java:2274)
 - New Ensemble: [xxx, xxx] for ledger: 1547399
   2025-08-01T17:09:16,474+0800 [BookKeeperClientWorker-OrderedExecutor-11-0] 
INFO  
org.apache.bookkeeper.client.LedgerHandle.lambda$ensembleChangeLoop$12(LedgerHandle.java:2274)
 - New Ensemble: [xxx, xxx] for ledger: 1547399
   2025-08-01T17:09:16,573+0800 [BookKeeperClientWorker-OrderedExecutor-11-0] 
INFO  
org.apache.bookkeeper.client.LedgerHandle.lambda$ensembleChangeLoop$12(LedgerHandle.java:2274)
 - New Ensemble: [xxx, xxx] for ledger: 1547399
   2025-08-01T17:09:16,632+0800 [BookKeeperClientWorker-OrderedExecutor-11-0] 
INFO  
org.apache.bookkeeper.client.LedgerHandle.lambda$ensembleChangeLoop$12(LedgerHandle.java:2274)
 - New Ensemble: [xxx, xxx] for ledger: 1547399
   2025-08-01T17:09:16,677+0800 [BookKeeperClientWorker-OrderedExecutor-11-0] 
INFO  
org.apache.bookkeeper.client.LedgerHandle.lambda$ensembleChangeLoop$12(LedgerHandle.java:2274)
 - New Ensemble: [xxx, xxx] for ledger: 1547399
   2025-08-01T17:09:16,837+0800 [BookKeeperClientWorker-OrderedExecutor-11-0] 
INFO  
org.apache.bookkeeper.client.LedgerHandle.lambda$ensembleChangeLoop$12(LedgerHandle.java:2274)
 - New Ensemble: [xxx, xxx] for ledger: 1547399
   2025-08-01T17:09:16,913+0800 [BookKeeperClientWorker-OrderedExecutor-11-0] 
INFO  
org.apache.bookkeeper.client.LedgerHandle.lambda$ensembleChangeLoop$12(LedgerHandle.java:2274)
 - New Ensemble: [xxx, xxx] for ledger: 1547399
   2025-08-01T17:09:16,966+0800 [BookKeeperClientWorker-OrderedExecutor-11-0] 
INFO  
org.apache.bookkeeper.client.LedgerHandle.lambda$ensembleChangeLoop$12(LedgerHandle.java:2274)
 - New Ensemble: [xxx, xxx] for ledger: 1547399
   2025-08-01T17:09:17,178+0800 [BookKeeperClientWorker-OrderedExecutor-11-0] 
INFO  
org.apache.bookkeeper.client.LedgerHandle.lambda$ensembleChangeLoop$12(LedgerHandle.java:2274)
 - New Ensemble: [xxx, xxx] for ledger: 1547399
   ```
   Scenario:
   e2/w2/a1
   Ledger `L1` has entries `(5-10)` to write (Thread A).
   Initial state: `LAC=4`, ledger metadata: `{5: [BK1, BK2]}`.
   Steps:
   
   1. Start writes: `5,6` send request to bk server; `7` fails (channel 
unwritable, queues callback).
   2. `Ensemble change triggered` (since `LAC=4` matches 
`newEnsembleStartEntry=5`):
   3. Metadata updated to `{5: [BK3, BK4]}` (callback queued).
   4. `5,6` succeed, `LAC` updates to `6`, entries removed from pending queue.
   5. Issue: Entries `5-6` were written to `[BK1,BK2]`, but ZK incorrectly 
records them as `[BK3,BK4]`.
   
   
   ### Changes
   
   make sure 
`org.apache.bookkeeper.client.LedgerHandle#sendAddSuccessCallbacks` only can be 
called after `unsetSuccessAndSendWriteRequest(...) completes`, which can avoid 
the fix incorrect meta of ledger.
   


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