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https://issues.apache.org/jira/browse/COUCHDB-2516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14287622#comment-14287622
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ILYA commented on COUCHDB-2516:
-------------------------------
There is a very big problem with active size calculation for following use
cases:
1) Document get updated after de-duplication
2) Document is deleted after de-duplication
Implementation of active size calculation for above case would require changing
on disk format. One of the approaches could be to add shared_att_sizes field
into full_doc_info record.
> Deduplicate attachements on compaction
> --------------------------------------
>
> Key: COUCHDB-2516
> URL: https://issues.apache.org/jira/browse/COUCHDB-2516
> Project: CouchDB
> Issue Type: New Feature
> Security Level: public(Regular issues)
> Components: Database Core
> Reporter: ILYA
>
> Currently we copy all attachments to .compact file even if they've been
> copied already on compacting previous revision of the document.
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