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https://issues.apache.org/jira/browse/LUCENE-3500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123511#comment-13123511
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Robert Muir commented on LUCENE-3500:
-------------------------------------
Where is getLiveDocs called in a tight loop?
I can see this making sense for the old IR.isDeleted, but we shouldnt be
calling getLiveDocs over and over again!
> improve getLiveDocs() performance
> ---------------------------------
>
> Key: LUCENE-3500
> URL: https://issues.apache.org/jira/browse/LUCENE-3500
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Yonik Seeley
> Priority: Minor
> Attachments: LUCENE-3500.patch
>
>
> On segmentReader, liveDocs is volatile because they used to be loaded on
> demand.
> This no longer appears to be the case... liveDocs are always loaded up front.
> This also means that getLiveDocs() can never fail (even after close), and we
> can remove the ensureOpen call.
> Minor optimizations, but volatile reads still do prevent optimizations across
> that boundary.
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