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https://issues.apache.org/jira/browse/SOLR-13411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17042274#comment-17042274
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Erick Erickson commented on SOLR-13411:
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bq: Why it's not solved so far?
Patches welcome.
> CompositeIdRouter calculates wrong route hash if atomic update is used for
> route.field
> --------------------------------------------------------------------------------------
>
> Key: SOLR-13411
> URL: https://issues.apache.org/jira/browse/SOLR-13411
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Affects Versions: 7.5
> Reporter: Niko Himanen
> Priority: Minor
>
> If collection is created with router.field -parameter to define some other
> field than uniqueField as route field and document update comes containing
> route field updated using atomic update syntax (for example set=123), hash
> for document routing is calculated from "set=123" and not from 123 which is
> the real value which may lead into routing document to wrong shard.
>
> This happens in CompositeIdRouter#sliceHash, where field value is used as is
> for hash calculation.
>
> I think there are two possible solutions to fix this:
> a) Allow use of atomic update also for route.field, but use real value
> instead of atomic update syntax to route document into right shard.
> b) Deny atomic update for route.field and throw exception.
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