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https://issues.apache.org/jira/browse/SOLR-15468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17360655#comment-17360655
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Andreas Hubold commented on SOLR-15468:
---------------------------------------
I've asked on the mailing list but didn't get an answer so far:
[https://lists.apache.org/thread.html/rcda1c2e660e2a2005d0e2e3ed5c3d98d672c148c790c5090ffb97aab%40%3Cusers.solr.apache.org%3E]
It would be great, if the check could be adapted so that adding the _root_
schema field to an existing would still be possible. Or if there were at least
some kind of configuration option to disable the check as some kind of
workaround.
[~dsmiley]: Sorry for tagging you directly, but maybe you want to have a look?
You added the code in SOLR-14923.
> 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. 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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