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https://issues.apache.org/jira/browse/LUCENE-5638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13988998#comment-13988998
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ASF subversion and git services commented on LUCENE-5638:
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Commit 1592353 from [~rcmuir] in branch 'dev/trunk'
[ https://svn.apache.org/r1592353 ]
LUCENE-5638: pack the core attributes into one impl by default
> 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
> Attachments: LUCENE-5638.patch, LUCENE-5638.patch, LUCENE-5638.patch,
> LUCENE-5638.patch, LUCENE-5638.patch
>
>
> 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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