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https://issues.apache.org/jira/browse/BOOKKEEPER-193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13242205#comment-13242205
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Ivan Kelly commented on BOOKKEEPER-193:
---------------------------------------
Actually, in the implementation there is one point where the snapshot
could be modified by another thread. But this is an implementation
detail. If we built the snapshot each time we called snapshot() it
wouldn't need to be concurrent.
> Ledger is garbage collected by mistake.
> ---------------------------------------
>
> Key: BOOKKEEPER-193
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-193
> Project: Bookkeeper
> Issue Type: Bug
> Components: bookkeeper-server
> Reporter: Sijie Guo
> Assignee: Sijie Guo
> Priority: Blocker
> Fix For: 4.1.0
>
> Attachments: BK-193.patch, BK-193.patch_v2, BOOKKEEPER-193.diff
>
>
> currently, we encountered such case: ledger is garbage collected by mistake,
> and following requests would fail due to NoLedgerException.
> {code}
> 2012-03-23 19:10:47,403 - INFO
> [GarbageCollectorThread:GarbageCollectorThread@234] - Garbage collecting
> deleted ledger index files.
> 2012-03-23 19:10:48,702 - INFO [GarbageCollectorThread:LedgerCache@544] -
> Deleting ledgerId: 89408
> 2012-03-23 19:10:48,703 - INFO [GarbageCollectorThread:LedgerCache@577] -
> Deleted ledger : 89408
> 2012-03-23 19:11:10,013 - ERROR [NIOServerFactory-3181:BookieServer@361] -
> Error writing 1@89408
> org.apache.bookkeeper.bookie.Bookie$NoLedgerException: Ledger 89408 not found
> at
> org.apache.bookkeeper.bookie.LedgerCache.getFileInfo(LedgerCache.java:228)
> at
> org.apache.bookkeeper.bookie.LedgerCache.updatePage(LedgerCache.java:260)
> at
> org.apache.bookkeeper.bookie.LedgerCache.putEntryOffset(LedgerCache.java:158)
> at
> org.apache.bookkeeper.bookie.LedgerDescriptor.addEntry(LedgerDescriptor.java:135)
> at
> org.apache.bookkeeper.bookie.Bookie.addEntryInternal(Bookie.java:1059)
> at org.apache.bookkeeper.bookie.Bookie.addEntry(Bookie.java:1099)
> at
> org.apache.bookkeeper.proto.BookieServer.processPacket(BookieServer.java:357)
> at
> org.apache.bookkeeper.proto.NIOServerFactory$Cnxn.readRequest(NIOServerFactory.java:315)
> at
> org.apache.bookkeeper.proto.NIOServerFactory$Cnxn.doIO(NIOServerFactory.java:213)
> at
> org.apache.bookkeeper.proto.NIOServerFactory.run(NIOServerFactory.java:124)
> {code}
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