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https://issues.apache.org/jira/browse/LUCENE-8269?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer updated LUCENE-8269:
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Attachment: LUCENE-8269.patch
> Detach downstream classes from IndexWriter
> ------------------------------------------
>
> Key: LUCENE-8269
> URL: https://issues.apache.org/jira/browse/LUCENE-8269
> Project: Lucene - Core
> Issue Type: Improvement
> Affects Versions: 7.4, master (8.0)
> Reporter: Simon Willnauer
> Priority: Major
> Fix For: 7.4, master (8.0)
>
> Attachments: LUCENE-8269.patch
>
>
> IndexWriter today is shared with many classes like BufferedUpdateStream,
> DocumentsWriter and DocumentsWriterPerThread. Some of them even acquire locks
> on the writer instance or assert that the current thread doesn't hold a lock.
> This makes it very difficult to have a manageable threading model.
>
> This change separates out the IndexWriter from those classes and makes
> them all
> independent of IW. IW now implements a new interface for DocumentsWriter
> to communicate
> on failed or successful flushes and tragic events. This allows IW to make
> it's critical
> methods private and execute all lock critical actions on it's private
> queue that ensures
> that the IW lock is not held. Follow-up changes will try to detach more
> code like
> publishing flushed segments to ensure we never call back into IW in an
> uncontrolled way.
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