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https://issues.apache.org/jira/browse/SOLR-8889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16488408#comment-16488408
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Shawn Heisey commented on SOLR-8889:
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[~jsp08], I've been following your thread on the mailing list. Using
deleteByQuery runs the risk of big pauses when merges happen, but I think it
might avoid the problems described on this issue.
SOLR-5890 seems to say that if you explicitly send a deleteById request to a
core that's a replica of the correct shard, rather than sending it to the
collection, and if all IDs in the delete are on that shard, deleteById might
work. (For SolrJ, that would require using HttpSolrClient rather than
CloudSolrClient)
The actual change for SOLR-5890 looks promising (using the \_route\_
parameter), but then SOLR-7384 appears to indicate that it doesn't actually
work correctly.
More than one of the issues touching on this problem has mentioned broadcasting
the delete to all shards as a workaround or a solution, but it seems that this
hasn't actually been implemented. One idea, which I admit is a drastic notion,
is to implement a parameter that would force deleteById on SolrCloud to send
the delete to all shards.
> 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
> Priority: Major
> 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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