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https://issues.apache.org/jira/browse/LUCENE-2558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12893911#action_12893911
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Jason Rutherglen commented on LUCENE-2558:
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I'm implementing a basic doc id iterator per DWPT which will allow us to 
implement delete by term, and the deleted docs sequence ids.  This is for 
merging of segments?  However we're using readers to do the merging so this 
really won't be useful?

> 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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