[SOLR-15468] Regression: Adding _root_ schema field to existing index causes atomic update failures

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: 8.8
• Component/s: update
• Labels: regression
• Assignee: Unassigned
• Reporter: Andreas Hubold
• Created: 10/Jun/21 08:27
• Updated: 23/Jun/21 13:50
• Resolved: 10/Jun/21 14:25

Description

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:

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)
 

 

Issue Links

• is caused by: SOLR-14923 Indexing performance is unacceptable when child documents are involved