ytong01 opened a new issue, #3953:
URL: https://github.com/apache/bookkeeper/issues/3953
**BUG REPORT**
We have a bookie node which having run a period of time, and it runs with
entryLogPerLedgerEnabled is false as default, Recently we change this property
to true, unfortunately the program occurs exception as below
<img width="911" alt="image"
src="https://github.com/apache/bookkeeper/assets/32755366/a623d0b5-ad18-48a6-84c2-bba36a2ee3ac";>
Steps to reproduce the behavior:
1. Startup a new bookie node, and the related properties as below:
ledgerStorageClass=org.apache.bookkeeper.bookie.SortedLedgerStorage
entryLogPerLedgerEnabled=false
2. Running this bookie after some time, change entryLogPerLedgerEnabled is
true, reboot the bookie node.
3. The program throw IllegalReferenceCountException
4. System.exit(5)
***Expected behavior***
The bookie support switch entrylogPerLedgerEnabled normally.
***Additional context***
We review the code and find the Entrylogger#flush method will be triggered
when GarbageCollectorThread doing compact entrylogs, which will make race
condition with syncthread#checkpoint at flushRotatedLogs point, However, the
flushRotatedLogs method in EntryLogManagerForEntryLogPerLedger is not protected
by synchonzied，hence BufferedLogChannel#close throw
IllegalReferenceCountException since a concurrency scenario.
Bookkeeper version : 4.15.0
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