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https://issues.apache.org/jira/browse/LUCENE-2558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12984331#action_12984331
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Jason Rutherglen commented on LUCENE-2558:
------------------------------------------

If we implement deletes via sequence id across all segments, then the .del file 
should probably remain the same (a set of bits)?  Also, when we load up the BV 
on IW start, then I guess we'll need to init the array appropriately.

> Use sequence ids for deleted docs
> ---------------------------------
>
>                 Key: LUCENE-2558
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2558
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>    Affects Versions: Realtime Branch
>            Reporter: Jason Rutherglen
>            Priority: Minor
>             Fix For: Realtime Branch
>
>
> Utilizing the sequence ids created via the update document
> methods, we will enable IndexReader deleted docs over a sequence
> id array. 
> One of the decisions is what primitive type to use. We can start
> off with an int[], then possibly move to a short[] (for lower
> memory consumption) that wraps around.

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