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https://issues.apache.org/jira/browse/BOOKKEEPER-447?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sijie Guo updated BOOKKEEPER-447:
---------------------------------
Attachment: BOOKKEEPER-447_force_flush_entry_logger.patch
Attach a patch to flush entry logger before flushing ledger index. Although it
is not the best and graceful way to resolve it, it is better than previous
patches.
The patch also fixed Ivan's test case.
> 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: Ivan Kelly
> Fix For: 4.2.0, 4.1.1
>
> Attachments:
> 0001-BOOKKEEPER-447-LedgerCacheImpl-waits-on-lock-object-.patch,
> 0001-BOOKKEEPER-447-LedgerCacheImpl-waits-on-lock-object-.patch,
> 0001-BOOKKEEPER-447-LedgerCacheImpl-waits-on-semaphore-no.patch,
> 0001-BOOKKEEPER-447-Throw-NoSuchEntry-if-entry-is-not-fou.patch,
> BOOKKEEPER-447.diff, BOOKKEEPER-447_force_flush_entry_logger.patch, perf.png
>
>
> 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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