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https://issues.apache.org/jira/browse/SOLR-2200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13192569#comment-13192569
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Mark Waddle commented on SOLR-2200:
-----------------------------------
Hi Robert,
I apologize for my ignorance, but why can't I see these changes in the current
dev/trunk? Am I looking in the wrong place?
Mark
> DIH DocBuilder - Improve perf. on large delta deletes
> -----------------------------------------------------
>
> Key: SOLR-2200
> URL: https://issues.apache.org/jira/browse/SOLR-2200
> Project: Solr
> Issue Type: Improvement
> Components: contrib - DataImportHandler
> Affects Versions: 1.4.1
> Reporter: Mark Waddle
> Assignee: Robert Muir
> Fix For: 3.1, 4.0
>
> Attachments: SOLR-2200.patch
>
>
> In collectDelta, the procedure that collects the PKs for the documents that
> should be updated or deleted for an entity, iterates over the entire deltaSet
> for every deleted document. This is very expensive when you are updating and
> deleting millions of documents in one delta-import.
> Considering that the comparison between deleted and delta is on the PK, lets
> build the deltaSet as a HashMap instead of a HashSet to enable quick key
> lookups and remove the need for repeated iterations.
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