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https://issues.apache.org/jira/browse/BOOKKEEPER-848?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matteo Merli updated BOOKKEEPER-848:
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Attachment: 0001-BOOKKEEPER-848-Use-volatile-for-lastAddConfirmed.patch
> Use volatile for lastAddConfirmed
> ---------------------------------
>
> Key: BOOKKEEPER-848
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-848
> Project: Bookkeeper
> Issue Type: Bug
> Affects Versions: 4.3.0
> Reporter: Matteo Merli
> Assignee: Matteo Merli
> Priority: Minor
> Fix For: 4.4.0
>
> Attachments:
> 0001-BOOKKEEPER-848-Use-volatile-for-lastAddConfirmed.patch
>
>
> LastAddConfirmed in LedgerHandle is updated when an entry is persisted
> successfully.
> When sending a new entry, the most recent lastAddConfirmed is sent along. The
> reason is to start with a reasonable (confirmed) entryId when doing ledger
> recovery, by reading all entries from lastAddConfirmed until a
> NoEntryException is reached.
> If lastAddConfirmed updates are not visible to the thread that is writing new
> entries, new entries will carrie an older lastAddConfirmed value, and
> recovering the ledger will requiring reading one-by-one many entries.
> When writing several thousand of entries per sec, the lastAddConfirmed can
> lag behind a lot from the real last entry.
> We should use volatile, to ensure writing thread sees the updated version.
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