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https://issues.apache.org/jira/browse/SOLR-13411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17046892#comment-17046892
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ASF subversion and git services commented on SOLR-13411:
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Commit 64193f052acbb216d393c719400637648664a1c1 in lucene-solr's branch
refs/heads/branch_8x from Mikhail Khludnev
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=64193f0 ]
SOLR-13411: reject incremental update for route.field, uniqueKey and
_version_.
> 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
> Assignee: Mikhail Khludnev
> Priority: Minor
> Attachments: SOLR-13411.patch, SOLR-13411.patch
>
>
> 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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