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https://issues.apache.org/jira/browse/SOLR-15468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17360945#comment-17360945
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Andreas Hubold commented on SOLR-15468:
---------------------------------------
Thanks David, that's really chaos and now I'm convinced that my attempt to keep
the existing index is just impossible. After updates, I now get multiple
results when querying by ID, also with Solr 8.6.3. I should have seen this
earlier, but I really haven't expected this. Thanks for pointing that out.
I will not try any further, and with that info, I also wouldn't need your PR
anymore.
If you think it would still make sense for other users, I'd of course do the
testing for you.
So maybe this ticket can be closed as "Not a bug" then. Thanks again for your
help and explanation.
> Regression: Adding _root_ schema field to existing index causes atomic update
> failures
> --------------------------------------------------------------------------------------
>
> Key: SOLR-15468
> URL: https://issues.apache.org/jira/browse/SOLR-15468
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: update
> Affects Versions: 8.8
> Reporter: Andreas Hubold
> Priority: Major
> Labels: regression
>
> In previous Solr releases (8.6.3) it was possible to add the \_root\_ field
> to the schema of an existing index, e.g to add functionality relying on child
> documents without reindexing all documents.
> This does not work anymore with Solr 8.8.2, because SOLR-14923 added a check
> in RealTimeGetComponent#getInputDocument that the root field contains the
> expected value. IIUC, the check does not only fail for wrong values, but also
> if the root field does not contain any value yet, as it's the case for
> documents that were added before the field was added to the schema.
> The check causes atomic/partial updates to fail:
> {noformat}
> Caused by: org.apache.solr.common.SolrException: Attempted an
> atomic/partial update to a child doc without indicating the _root_ somehow.
> at
> org.apache.solr.handler.component.RealTimeGetComponent.getInputDocument(RealTimeGetComponent.java:746)
> at
> org.apache.solr.update.processor.DistributedUpdateProcessor.getUpdatedDocument(DistributedUpdateProcessor.java:689)
> at
> org.apache.solr.update.processor.DistributedUpdateProcessor.doVersionAdd(DistributedUpdateProcessor.java:373)
> at
> org.apache.solr.update.processor.DistributedUpdateProcessor.lambda$versionAdd$0(DistributedUpdateProcessor.java:336)
> at
> org.apache.solr.update.VersionBucket.runWithLock(VersionBucket.java:50)
> at
> org.apache.solr.update.processor.DistributedUpdateProcessor.versionAdd(DistributedUpdateProcessor.java:336)
> at
> org.apache.solr.update.processor.DistributedUpdateProcessor.processAdd(DistributedUpdateProcessor.java:222)
> at
> org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:55)
> {noformat}
>
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