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https://issues.apache.org/jira/browse/LUCENE-769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12463761
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Yonik Seeley commented on LUCENE-769:
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Those performance numbers don't make sense to me.
Why would DocCaching sort be so much faster than FieldCache sort the second
time on the same IndexReader?
Using a cached FieldCache entry for sorting involves an array lookup... how do
you improve on that?
Or do you open a new reader for each test?
Also, you specify the size of the index, but not the size of the number of
documents to be sorted (that match the query). DocCacheSorting should use much
more memory than the FieldCache (and be slower) if the number of documents to
be sorted is large, right?
> [PATCH] Performance improvement for some cases of sorted search
> ---------------------------------------------------------------
>
> Key: LUCENE-769
> URL: https://issues.apache.org/jira/browse/LUCENE-769
> Project: Lucene - Java
> Issue Type: Improvement
> Affects Versions: 2.0.0
> Reporter: Artem Vasiliev
> Attachments: DocCachingSorting.patch, DocCachingSorting.patch
>
>
> It's a small addition to Lucene that significantly lowers memory consumption
> and improves performance for sorted searches with frequent index updates and
> relatively big indexes (>1mln docs) scenario. This solution supports only
> single-field sorting currently (which seem to be quite popular use case).
> Multiple fields support can be added without much trouble.
> The solution is this: documents from the sorting set (instead of given
> field's values from the whole index - current FieldCache approach) are cached
> in a WeakHashMap so the cached items are candidates for GC. Their fields
> values are then fetched from the cache and compared while sorting.
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