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https://issues.apache.org/jira/browse/LUCENE-2558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12984350#action_12984350
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Michael McCandless commented on LUCENE-2558:
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We could also [someday] move deletes to a stacked model... where we only write
"deltas" (newly deleted docs in the current session) against the segment, and
on open we coalesce these. Merging would also periodically coalesce and write
a new full vector...
> 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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