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https://issues.apache.org/jira/browse/SOLR-8889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15209824#comment-15209824
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Noble Paul commented on SOLR-8889:
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bq.That's another gotcha, we should perhaps automatically add one?
Yes. totally
> SolrCloud deleteById is broken when router.field is set
> -------------------------------------------------------
>
> Key: SOLR-8889
> URL: https://issues.apache.org/jira/browse/SOLR-8889
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud, SolrJ
> Reporter: David Smiley
> Attachments: SOLR_8889_investigation.patch
>
>
> If you set router.field on your collection to shard by something other than
> the ID, then deleting documents by ID fails some of the time (how much
> depends on how sharded the collection is). I suspect that it'd work if the
> IDs provided when deleting by ID were prefixed using the composite key syntax
> -- "routekey!id" though I didn't check. This is terrible. Internally Solr
> should broadcast to all the shards if there is no composite key prefix.
> Some affected code is UpdateRequest.getRoutes.
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