Robert Muir created LUCENE-5638:
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Summary: Default Attributes are expensive
Key: LUCENE-5638
URL: https://issues.apache.org/jira/browse/LUCENE-5638
Project: Lucene - Core
Issue Type: Bug
Components: modules/analysis
Reporter: Robert Muir
Changes like LUCENE-5634 make it clear that the default AttributeFactory stuff
has a very high cost: weakmaps/reflection/etc.
Additionally I think clearAttributes() is more expensive than it should be: it
has to traverse a linked-list, calling clear() per token.
Operations like cloning (save/restoreState) have a high cost tll.
Maybe we can have a better Default? In other words, rename
DEFAULT_ATTRIBUTE_FACTORY to REFLECTION_ATTRIBUTE_FACTORY, and instead have a
faster default factory that just has one AttributeImpl with the "core ones"
that 95% of users are dealing with (TOKEN_ATTRIBUTE_FACTORY?): anything outside
of that falls back to reflection.
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