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https://issues.apache.org/jira/browse/LUCENE-4928?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13629604#comment-13629604
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Adrien Grand commented on LUCENE-4928:
--------------------------------------

I'm looking at the term vectors format, and it can't have a configurable number 
of documents per chunk without changing the format (it would need to store the 
max number of documents per chunk to be able at merging time to decide on 
whether it can bulk-merge the next chunk). So for now I think we can just have 
a hard limit and make it configurable in the future if we have a need for it?
                
> Compressed stored fields: make the maximum number of docs in a chunk 
> configurable
> ---------------------------------------------------------------------------------
>
>                 Key: LUCENE-4928
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4928
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Adrien Grand
>            Assignee: Adrien Grand
>            Priority: Minor
>             Fix For: 4.3
>
>
> When documents are very small (a few bytes), there can be so many of them in 
> a single chunk that merging can become very slow. Making the maximum number 
> of documents per chunk configurable could help.

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