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https://issues.apache.org/jira/browse/SOLR-15705?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18018382#comment-18018382
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Paul Rütter commented on SOLR-15705:
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I created the backport PR for 8.11 here:
https://github.com/apache/lucene-solr/pull/2687
> Distribute a DeleteById to all shards when using the CompositeId router with
> a router field defined and field value is missing in request
> -----------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-15705
> URL: https://issues.apache.org/jira/browse/SOLR-15705
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Reporter: Michael Kosten
> Assignee: Eric Pugh
> Priority: Major
> Labels: pull-request-available
> Fix For: 9.0
>
> Time Spent: 5h 50m
> Remaining Estimate: 0h
>
> When issuing a DeleteById command for a collection using the CompositeId
> router with a router field defined and the route value is missing from the
> request, the DeleteById fails silently, even if it happens to have been sent
> to the correct shard. Instead of failing silently, the request could be
> forwarded to all shard leaders and from there to all replicas. Another
> required change is that the deletion would need to be performed even though
> the route value is missing. The deletion would be a no-op on the shards where
> the document does not exist.
> One use case for this feature is when the routing key value is volatile and
> you need to guarantee no duplicates exist when updating a document if it
> happens to change shards. Another use case is if you want to delete a
> document without referencing a database to retrieve the route field value.
> A work-around is to use a DeleteByQuery. However, my testing has found that
> DeleteById performs significantly better, even when sent to all shards.
> Additionally, I've found that a heavy mixed load of DeleteByQuery commands
> and Add commands can lead to node failures when there are multiple replicas.
> Additional comments are in SOLR-6910, however, that JIRA is specific to the
> implicit router and I mistakenly added them there.
>
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