zhaizhibo opened a new issue, #4651:
URL: https://github.com/apache/bookkeeper/issues/4651
**BUG REPORT**
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]`.
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