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https://issues.apache.org/jira/browse/SOLR-9477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18132109#comment-18132109
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Nick Shanin commented on SOLR-9477:
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>From code reading against apache/main b73f03976fa, UUIDUpdateProcessorFactory
>does not iterate child documents, while AddSchemaFieldsUpdateProcessorFactory
>(solr/core/src/java/org/apache/solr/update/processor/AddSchemaFieldsUpdateProcessorFactory.java:556)
> and IgnoreLargeDocumentProcessorFactory do. Do you still see missing ids on
>child documents with the current chain, and which processor should handle them?
🤖 AI-generated 🤖
> UpdateRequestProcessors ignore child documents
> ----------------------------------------------
>
> Key: SOLR-9477
> URL: https://issues.apache.org/jira/browse/SOLR-9477
> Project: Solr
> Issue Type: Bug
> Affects Versions: 6.2, 7.0
> Reporter: Alexandre Rafalovitch
> Assignee: Alexandre Rafalovitch
> Priority: Major
> Labels: UpdateProcessor
>
> UpdateRequestProcessors completely ignore child documents. The only exception
> is AddSchemaFieldsUpdateProcessorFactory. The rest seem to be completely
> unaware that SolrInputDocument has getChildDocuments() or related methods.
> Easy test (on Solr 6.2):
> This works (with IDs auto-assigned and field names generated):
> {code}
> bin/solr create -c childtest
> bin/post -c childtest -type application/json -format solr -d '[{"a":1,"b":2}]'
> {code}
> This fails as the second/third command, with "missing ID field":
> {code}
> bin/post -c childtest -type application/json -format solr -d
> '[{"a":1,"b":2,"_childDocuments_":[{"c":3,"d":4}]}]'
> {code}
> The message:
> {noformat}
> SimplePostTool version 5.0.0
> POSTing args to http://localhost:8983/solr/childtest/update...
> SimplePostTool: WARNING: Solr returned an error #400 (Bad Request) for url:
> http://localhost:8983/solr/childtest/update
> SimplePostTool: WARNING: Response:
> {"responseHeader":{"status":400,"QTime":4},"error":{"metadata":["error-class","org.apache.solr.common.SolrException","root-error-class","org.apache.solr.common.SolrException"],"msg":"[doc=null]
> missing required field: id","code":400}}
> SimplePostTool: WARNING: IOException while reading response:
> java.io.IOException: Server returned HTTP response code: 400 for URL:
> http://localhost:8983/solr/childtest/update
> COMMITting Solr index changes to
> http://localhost:8983/solr/childtest/update...
> Time spent: 0:00:00.042
> {noformat}
> I also verified it with BlankRemoving URP. I think this is a global problem.
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