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https://issues.apache.org/jira/browse/LUCENE-8571?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer resolved LUCENE-8571.
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Resolution: Fixed
Fix Version/s: 7.7
master (8.0)
> Don't block on FrozenBufferedUpdates#apply during IW#processEvents
> ------------------------------------------------------------------
>
> Key: LUCENE-8571
> URL: https://issues.apache.org/jira/browse/LUCENE-8571
> Project: Lucene - Core
> Issue Type: Improvement
> Affects Versions: 7.5, master (8.0)
> Reporter: Simon Willnauer
> Priority: Major
> Fix For: master (8.0), 7.7
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> While indexing we try to apply frozen deletes packages concurrently
> on indexing threads if necessary. This is done in an opaque way via
> IndexWriter#processEvents. Yet, when we commit or refresh we have to
> ensure we apply all frozen update packages before we return.
> Today we execute the apply method in a blocking fashion which is unnecessary
> when we are in a IndexWriter#processEvents context, we block indexing
> threads while they could just continue since it's already being applied.
> We also might wait in BufferedUpdatesStream when we apply all necessary
> updates
> were we can continue with other work instead of waiting.
> This change also tries to apply the packages that are not currently applied
> first in order to not unnecessarily block.
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