Simon Willnauer created LUCENE-8571:
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Summary: 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
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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