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https://issues.apache.org/jira/browse/SOLR-12185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16426167#comment-16426167
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Shawn Heisey commented on SOLR-12185:
-------------------------------------

I've attempted to ask on the #lucene IRC channel whether this is something they 
could fix.  I didn't get an answer.  You could try and get it fixed on the 
Lucene side, but I think there's a good chance that they'll say it *can't* be 
fixed, because you already have data in the index with one docValues 
designation.  I bet they'll say that you can't add more data with a different 
designation until that previous data is entirely gone.  Not just deleted -- but 
GONE.  Deleted docs are only *marked* as deleted.

> Can't change Single Valued field to Multi Valued even by deleting/readding
> --------------------------------------------------------------------------
>
>                 Key: SOLR-12185
>                 URL: https://issues.apache.org/jira/browse/SOLR-12185
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: Schema and Analysis
>    Affects Versions: 7.1
>            Reporter: Cetra Free
>            Priority: Major
>
> Changing a single-valued field to multi-valued field with doc values breaks 
> things.  This doesn't matter if you change the field or do a complete delete 
> and re-add of the field.  The only way I have found to "fix" this is to 
> delete the entire core from disk and re-add it.
> h2. Steps to replicate:
>  * Create a field, make it single valued with doc values
>  * Index a couple of docs
>  * Delete the field
>  * Add the field again with the same name, but change it to multiValued
>  * Try indexing a couple of docs
> h2. Expected result:
> The documents are indexed correctly and there are no issues
> h2. Actual outcome:
> The documents refuse to be indexed and you see this in the logs:
> {code:java}
> org.apache.solr.common.SolrException: Exception writing document id 
> 6a3226c8-c904-40d7-aecb-76c3515db7b8 to the index; possible analysis error: 
> cannot change DocValues type from SORTED to SORTED_SET for field 
> "example_field"
>         at 
> org.apache.solr.update.DirectUpdateHandler2.addDoc(DirectUpdateHandler2.java:221)
>         at 
> org.apache.solr.update.processor.RunUpdateProcessor.processAdd(RunUpdateProcessorFactory.java:67)
>         at 
> org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:55)
>         at 
> org.apache.solr.update.processor.DistributedUpdateProcessor.doLocalAdd(DistributedUpdateProcessor.java:991)
>         at 
> org.apache.solr.update.processor.DistributedUpdateProcessor.versionAdd(DistributedUpdateProcessor.java:1207)
>         at 
> org.apache.solr.update.processor.DistributedUpdateProcessor.processAdd(DistributedUpdateProcessor.java:753)
>         at 
> org.apache.solr.update.processor.LogUpdateProcessorFactory$LogUpdateProcessor.processAdd(LogUpdateProcessorFactory.java:103)
>         at 
> org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:55)
>         at 
> org.apache.solr.update.processor.AddSchemaFieldsUpdateProcessorFactory$AddSchemaFieldsUpdateProcessor.processAdd(AddSchemaFieldsUpdateProcessorFactory.java:474)
>         at 
> org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:55)
>         at 
> org.apache.solr.update.processor.FieldMutatingUpdateProcessor.processAdd(FieldMutatingUpdateProcessor.java:118)
>         at 
> org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:55)
>         at 
> org.apache.solr.update.processor.FieldMutatingUpdateProcessor.processAdd(FieldMutatingUpdateProcessor.java:118)
>         at 
> org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:55)
>         at 
> org.apache.solr.update.processor.FieldMutatingUpdateProcessor.processAdd(FieldMutatingUpdateProcessor.java:118)
>         at 
> org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:55)
>         at 
> org.apache.solr.update.processor.FieldMutatingUpdateProcessor.processAdd(FieldMutatingUpdateProcessor.java:118)
>         at 
> org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:55)
>         at 
> org.apache.solr.update.processor.FieldNameMutatingUpdateProcessorFactory$1.processAdd(FieldNameMutatingUpdateProcessorFactory.java:74)
>         at 
> org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:55)
>         at 
> org.apache.solr.update.processor.FieldMutatingUpdateProcessor.processAdd(FieldMutatingUpdateProcessor.java:118)
>         at 
> org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:55)
>         at 
> org.apache.solr.update.processor.AbstractDefaultValueUpdateProcessorFactory$DefaultValueUpdateProcessor.processAdd(AbstractDefaultValueUpdateProcessorFactory.java:91)
>         at 
> org.apache.solr.handler.dataimport.SolrWriter.upload(SolrWriter.java:80)
>         at 
> org.apache.solr.handler.dataimport.DataImportHandler$1.upload(DataImportHandler.java:257)
>         at 
> org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:527)
>         at 
> org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:415)
>         at 
> org.apache.solr.handler.dataimport.DocBuilder.doFullDump(DocBuilder.java:330)
>         at 
> org.apache.solr.handler.dataimport.DocBuilder.execute(DocBuilder.java:233)
>         at 
> org.apache.solr.handler.dataimport.DataImporter.doFullImport(DataImporter.java:415)
>         at 
> org.apache.solr.handler.dataimport.DataImporter.runCmd(DataImporter.java:474)
>         at 
> org.apache.solr.handler.dataimport.DataImporter.lambda$runAsync$0(DataImporter.java:457)
>         at java.lang.Thread.run(Thread.java:748)
> Caused by: java.lang.IllegalArgumentException: cannot change DocValues type 
> from SORTED to SORTED_SET for field "example_field"
>         at 
> org.apache.lucene.index.FieldInfos$FieldNumbers.verifyConsistent(FieldInfos.java:293)
>         at 
> org.apache.lucene.index.FieldInfos$FieldNumbers.setDocValuesType(FieldInfos.java:341)
>         at 
> org.apache.lucene.index.DefaultIndexingChain.indexDocValue(DefaultIndexingChain.java:524)
>         at 
> org.apache.lucene.index.DefaultIndexingChain.processField(DefaultIndexingChain.java:466)
>         at 
> org.apache.lucene.index.DefaultIndexingChain.processDocument(DefaultIndexingChain.java:392)
>         at 
> org.apache.lucene.index.DocumentsWriterPerThread.updateDocument(DocumentsWriterPerThread.java:239)
>         at 
> org.apache.lucene.index.DocumentsWriter.updateDocument(DocumentsWriter.java:481)
>         at 
> org.apache.lucene.index.IndexWriter.updateDocument(IndexWriter.java:1717)
>         at 
> org.apache.solr.update.DirectUpdateHandler2.updateDocument(DirectUpdateHandler2.java:960)
>         at 
> org.apache.solr.update.DirectUpdateHandler2.updateDocOrDocValues(DirectUpdateHandler2.java:949)
>         at 
> org.apache.solr.update.DirectUpdateHandler2.doNormalUpdate(DirectUpdateHandler2.java:329)
>         at 
> org.apache.solr.update.DirectUpdateHandler2.addDoc0(DirectUpdateHandler2.java:266)
>         at 
> org.apache.solr.update.DirectUpdateHandler2.addDoc(DirectUpdateHandler2.java:216)
>         ... 32 more{code}
>  
>  
>  
>  
>  



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