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https://issues.apache.org/jira/browse/BOOKKEEPER-685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13776687#comment-13776687
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Sijie Guo commented on BOOKKEEPER-685:
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[~rakeshr]
{quote}
#onRotateEntryLog is not a good name for 4.2 branch. since in the 4.2 patch for
BOOKKEEPER-664, onRotateEntryLog actually means entry logger file is flushed,
{quote}
as my previous comment, your case will never happen. in 4.2 branch, if addEntry
happened after #onRotateEntryLog, GCThread will setFlushed to false again; if
addEntry happened before #onRotateEntryLog, this entry is already flushed.
> Race in compaction algorithm from BOOKKEEPER-664
> ------------------------------------------------
>
> Key: BOOKKEEPER-685
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-685
> Project: Bookkeeper
> Issue Type: Bug
> Reporter: Ivan Kelly
> Priority: Blocker
> Fix For: 4.2.2
>
>
> I discovered a race in the algorithm when I was forward porting to trunk.
> 1) Thread1: flushed.set(false)
> 2) Thread2: onRotateEntryLog() // flushed.set(true)
> 3) Thread1: entryLogger addEntry L123-E456
> 4) Thread1: offsets > max, waits for flushed, flushed is true(as set in 2),
> L123-E456 updated in ledger cache
> 5) T2: L123 flushed out of ledger cache
> 6) Crash
> This will possible lose 1 entry. I've only reasoned this, not observed it,
> but it can happen.
> The fix is pretty easy. EntryLoggerListener should notify with the point
> offset in the entry log it has synced as far as.
>
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