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https://issues.apache.org/jira/browse/LUCENE-8590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16709017#comment-16709017
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Simon Willnauer commented on LUCENE-8590:
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[~mikemccand] [~shaie] FYI
> Optimize DocValues update datastructures
> ----------------------------------------
>
> Key: LUCENE-8590
> URL: https://issues.apache.org/jira/browse/LUCENE-8590
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Simon Willnauer
> Priority: Major
> Fix For: 7.6, master (8.0)
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Today we are using a LinkedHashMap to buffer doc-values updates in
> BufferedUpdates. This on the one hand uses an Object based datastructure
> and on the other requires re-encoding the data into a more compact
> representation
> once the BufferedUpdates are frozen. This change uses a more compact
> represenation
> for the updates already in the BufferedUpdates in a parallel-array like
> datastructure
> that can be reused in FrozenBufferedDeletes. It also adds an much simpler
> to use
> API to consume the updates and allows for internal memory optimization
> for common
> case updates.
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