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https://issues.apache.org/jira/browse/OAK-10660?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Reschke reassigned OAK-10660:
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Assignee: Manfred Baedke (was: Julian Reschke)
> DocumentNodeStore: avoid repeated commits of :childOrder in branch commits
> --------------------------------------------------------------------------
>
> Key: OAK-10660
> URL: https://issues.apache.org/jira/browse/OAK-10660
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: documentmk
> Reporter: Julian Reschke
> Assignee: Manfred Baedke
> Priority: Major
>
> - While persisting the branch commits, we are persisting large :childOrder
> properties repeatedly. In practice, only the last value is needed, so the
> previous ones could be cleaned up.
> - We currently do not keep information about when (revision) and where (_id)
> we have set :childOrder.
> - The "clean" approach would be to maintain a map of _id/revision that tells
> us in which revision we last set :childOrder. That could be used to pair the
> setting of the new value with a removal of the previous one.
> - But we may be able to simplify that: just maintain a list of _all_
> revisions that changed :childOrder, and any time we need to set a new value
> for :childOrder, nuke the entries for all of these revisions. This would be
> harmless because an extra REMOVE_MAP_ENTRY operation is essentially free,
> except fo ra small overhead in processing.
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