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https://issues.apache.org/jira/browse/OAK-6653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16167723#comment-16167723
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Francesco Mari commented on OAK-6653:
-------------------------------------
[~dulceanu], the patch looks good to me. I also think that the implementations
of {{ReadOnlyRevisions#getPersistedHead}} and
{{MemoryStoreRevisions#getPersistedHead}} are correct as they are in the patch.
> Standby server must always send the persisted head to clients
> -------------------------------------------------------------
>
> Key: OAK-6653
> URL: https://issues.apache.org/jira/browse/OAK-6653
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: segment-tar, tarmk-standby
> Affects Versions: 1.7.7
> Reporter: Andrei Dulceanu
> Assignee: Andrei Dulceanu
> Labels: cold-standby
> Fix For: 1.7.8
>
> Attachments: OAK-6653.patch
>
>
> Currently the standby server sends an un-persisted head record to clients.
> Under normal circumstances, the TarMK flush thread is able to persist it and
> its corresponding segment at a 5 seconds interval.
> However, there are cases (uploading a very large blob > 10 GB) in which the
> flush thread writes the segment too late, and the 20s allowed by
> {{FileStoreUtil#readSegmentWithRetry}} are not enough. Therefore the server
> can't read the segment containing the head record and a timeout occurs on the
> client.
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