Simon Willnauer created LUCENE-9304:
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Summary: Clean up DWPTPool
Key: LUCENE-9304
URL: https://issues.apache.org/jira/browse/LUCENE-9304
Project: Lucene - Core
Issue Type: Improvement
Affects Versions: master (9.0), 8.6
Reporter: Simon Willnauer
DWPTPool currently uses an indirection called ThreadState to hold DWPT
instances. This class holds several information that belongs in other places,
inherits from ReentrantLock and has a mutable nature. Instead we could pool the
DWPT directly and remove other indirections inside DWPTFlushControl if we move
some of the ThreadState properties to DWPT directly. The threadpool also has a
problem that is grows it's ThreadStates to the number of concurrently indexing
threads but never shrinks it if they are reduced. With pooling DWPT directly
this limitation could be removed.
In summary, this component has seen quite some refactoring and requires some
cleanups and docs changes in order to stay the test of time.
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