Simon Willnauer created LUCENE-8269:
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Summary: 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
Fix For: 7.4, master (8.0)
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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