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https://issues.apache.org/jira/browse/BOOKKEEPER-193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13242234#comment-13242234
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Flavio Junqueira commented on BOOKKEEPER-193:
---------------------------------------------
I actually got confused with the structures. I just realized that the snapshot
itself is a ConcurrentSkipListMap.
One of my concerns in the discussion about ConcurrentHashMap is that articles
like this:
http://www.informit.com/guides/content.aspx?g=java&seqNum=246
say that the performance of ConcurrentHashMaps is not great with a large number
of items. updates and updatesToMerge, however, are not expected to hold a
pretty large number of items, even if the bookie has a large number of active
ledgers. Also, as Ivan pointed out offline, this is not on the critical path,
so it is not much of a concern.
The patch is good for me, +1.
> 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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