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https://issues.apache.org/jira/browse/LUCENE-4512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13610616#comment-13610616
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Commit Tag Bot commented on LUCENE-4512:
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[branch_4x commit] Adrien Grand
http://svn.apache.org/viewvc?view=revision&revision=1404216
LUCENE-4512: Additional memory savings for
CompressingStoredFieldsIndex.MEMORY_CHUNK (merged from r1404215).
> Additional memory savings in CompressingStoredFieldsIndex.MEMORY_CHUNK
> ----------------------------------------------------------------------
>
> Key: LUCENE-4512
> URL: https://issues.apache.org/jira/browse/LUCENE-4512
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: 4.1, 5.0
>
> Attachments: LUCENE-4512.patch, LUCENE-4512.patch
>
>
> Robert had a great idea to save memory with
> {{CompressingStoredFieldsIndex.MEMORY_CHUNK}}: instead of storing the
> absolute start pointers we could compute the mean number of bytes per chunk
> of documents and only store the delta between the actual value and the
> expected value (avgChunkBytes * chunkNumber).
> By applying this idea to every n(=1024?) chunks, we would even:
> - make sure to never hit the worst case (delta ~= maxStartPointer)
> - reduce memory usage at indexing time.
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