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https://issues.apache.org/jira/browse/BOOKKEEPER-198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13242192#comment-13242192
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Flavio Junqueira commented on BOOKKEEPER-198:
---------------------------------------------
Thanks, Sijie. The patch looks good, but I'm now confused by a different thing.
I couldn't find code to decrement pageCount in trunk. Shouldn't we decrement
pageCount as we flush pages? Consequently, there should a line somewhere
decrementing it, no?
I'm mentioning this because it might be worth having a test, not necessarily
for this jira, that confirms that our logic increments and decrements
correctly. In particular, we should test that it grows and eventually becomes
zero again, never going negative.
> replaying entries of deleted ledgers would exhaust ledger cache.
> ----------------------------------------------------------------
>
> Key: BOOKKEEPER-198
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-198
> Project: Bookkeeper
> Issue Type: Bug
> Reporter: Sijie Guo
> Assignee: Sijie Guo
> Fix For: 4.1.0
>
> Attachments: BK-198.patch, BK-198.patch_v2
>
>
> we found that replaying entries of deleted ledgers would exhaust ledger
> cache. then ledger cache would no clean page to grab, it would throw
> following exception.
> {code}
> java.util.NoSuchElementException
> at java.util.LinkedList.getFirst(LinkedList.java:109)
> at
> org.apache.bookkeeper.bookie.LedgerCacheImpl.grabCleanPage(LedgerCacheImpl.java:454)
> at
> org.apache.bookkeeper.bookie.LedgerCacheImpl.putEntryOffset(LedgerCacheImpl.java:165)
> {code}
> this issue is because bookie grabs a clean page but fail to updating page due
> to NoLedgerException, but bookie doesn't return this clean page back to
> ledger cache. so the ledger cache is exhausted, when new ledger want to grab
> a clean page, it failed to find available page.
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