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https://issues.apache.org/jira/browse/SOLR-15293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17308888#comment-17308888
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Chris M. Hostetter commented on SOLR-15293:
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If we make this change, we can also remove AddUpdateCommand.updateTerm, and the
associated special hack logic in DirectUpdateHandler2.java
> Deprecate/remove overwriteDupes option from SignatureUpdateProcessorFactory
> ---------------------------------------------------------------------------
>
> Key: SOLR-15293
> URL: https://issues.apache.org/jira/browse/SOLR-15293
> Project: Solr
> Issue Type: Sub-task
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Chris M. Hostetter
> Priority: Major
>
> The design principle of the {{overwriteDupes}} option of
> SignatureUpdateProcessorFactory is something that is only viable in single
> shard use cases, and even then it currently doesn't work because
> UpdateCommand "options" are not included when Shard Leaders write updates to
> the tlog, or forwards them to other replicas (SOLR-8030). With multiple
> shards it can never be viable w/o broadcasting a "Delete By Query" to every
> replica on every document add/update (SOLR-3473) which is vastly less
> efficient then the current low level {{updateDocument(Term,...)}} support
> provided by IndexWriter for replacing documents by uniqueKey.
> I think in general we should remove the {{overwriteDupes}} option completely.
> If SignatureUpdateProcessorFactory is used to generate a synthetic uniqueKey
> field then the existing Solr/Lucene behavior of routing the document to the
> correct shard, and replacing any prior instances of that doc will work find.
> The functionality of SignatureUpdateProcessorFactory should be constrained
> *solely* to generating a signature – if that signature is put in the unique
> key field, then de-duplication will happen automatically.
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