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https://issues.apache.org/jira/browse/LUCENE-7335?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless resolved LUCENE-7335.
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Resolution: Fixed
> IndexWriter.setCommitData should be late binding
> ------------------------------------------------
>
> Key: LUCENE-7335
> URL: https://issues.apache.org/jira/browse/LUCENE-7335
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: master (7.0), 6.2
>
> Attachments: LUCENE-7335.patch
>
>
> Today, {{IndexWriter.setCommitData}} is early-binding: as soon as you call
> it, it clones the provided map and later on when commit is called, it uses
> that clone.
> But this makes it hard for some use cases where the app needs to record more
> timely information based on when specifically the commit actually occurs.
> E.g., with LUCENE-7302, it would be helpful to store the max completed
> sequence number in the commit point: that would be a lower bound of
> operations that were after the commit.
> I think the most minimal way to do this would be to upgrade the existing
> method to take an {{Iterable<Map.Entry<String,String>}}, and document that
> it's now late binding, i.e. IW will pull an {{Iterator}} from that when it's
> time to write the segments file.
> Or we could also make an explicit interface that you pass (seems like
> overkill), or maybe have a listener or something (or you subclass IW) that's
> invoked when the commit is about to write the segments file, but that also
> seems like overkill.
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