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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4512) Additional memory savings in CompressingStoredFieldsIndex.MEMORY_CHUNK
Date Tue, 30 Oct 2012 20:38:15 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487200#comment-13487200
] 

Robert Muir commented on LUCENE-4512:
-------------------------------------

And once you get all this baked in aren't you itching to do the vectors files too? :)
                
> 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
>
>         Attachments: 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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