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https://issues.apache.org/jira/browse/BOOKKEEPER-447?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487782#comment-13487782
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Flavio Junqueira edited comment on BOOKKEEPER-447 at 10/31/12 1:58 PM:
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I don't think this change is necessary, Sijie, exactly because of the point you
make about not violating any of our guarantees. It is true that the change is
not complex, but we are now adding more threads to the story and the change is
not strictly necessary.
was (Author: fpj):
I don't think this change is necessary, Sijie, exactly because the point
you make about not violating any of our guarantees. It is true that the change
is not complex, but we are now adding more threads to the story and the change
is not strictly necessary.
> Bookie can fail to recover if index pages flushed before ledger flush
> acknowledged
> ----------------------------------------------------------------------------------
>
> Key: BOOKKEEPER-447
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-447
> Project: Bookkeeper
> Issue Type: Bug
> Components: bookkeeper-server
> Affects Versions: 4.2.0
> Reporter: Yixue (Andrew) Zhu
> Assignee: Robin Dhamankar
> Labels: patch
> Fix For: 4.2.0
>
>
> Bookie index page steal (LedgerCacheImpl::grabCleanPage) can cause index file
> to reflect unacknowledged entries (due to flushLedger). Suppose ledger and
> entry fail to flush due to Bookkeeper server crash, it will cause ledger
> recovery not able to use the bookie afterward, due to
> InterleavedStorageLedger::getEntry throws IOException.
> If the ackSet bookies all experience this problem (DC environment), the
> ledger will not be able to recover.
> The problem here essentially a violation of WAL. One reasonable fix is to
> track ledger flush progress (either per-ledger entry, or per-topic message).
> Do not flush index pages which tracks entries whose ledger (log) has not been
> flushed.
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