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https://issues.apache.org/jira/browse/SOLR-1908?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hoss Man resolved SOLR-1908.
----------------------------

    Resolution: Fixed

Committed revision 944463.

Thanks for reporting this Markus.

> SignatureUpdateProcessor does not fail on invalid config, can lead to 
> deleting all docs (Deduplication)
> -------------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-1908
>                 URL: https://issues.apache.org/jira/browse/SOLR-1908
>             Project: Solr
>          Issue Type: Bug
>          Components: update
>    Affects Versions: 1.4
>            Reporter: Markus
>            Assignee: Hoss Man
>            Priority: Minor
>             Fix For: 1.5
>
>         Attachments: SOLR-1908.patch, SOLR-1908.patch
>
>
> Dedupe removes all documents from the index if overwriteDupes=true and the 
> schema's signature field has indexed=false. The maxDoc value does grow as it 
> always does but numDocs is always zero.
> solrconfig.xml
>     <bool name="overwriteDupes">true</bool>
>     <str name="signatureField">sig</str>
> schema.xml
>     <field name="sig" type="string" stored="true" indexed="false" 
> multiValued="true" />
> mailinglist
> http://lucene.472066.n3.nabble.com/Dedupe-and-overwriteDupes-setting-td809320.html
> log entries
> May 12, 2010 2:35:34 PM org.apache.solr.core.SolrDeletionPolicy onInit
> INFO: SolrDeletionPolicy.onInit: commits:num=1                        
>         
> commit{dir=/opt/apache/solr/data/index,segFN=segments_1,version=1273667628292,generation=1,filenames=[segments_1]
> May 12, 2010 2:35:34 PM org.apache.solr.core.SolrDeletionPolicy updateCommits 
>                                            
> INFO: newest commit = 1273667628292                                           
>                                            
> May 12, 2010 2:35:35 PM org.apache.solr.update.processor.LogUpdateProcessor 
> finish                                       
> INFO: {add=[<ID's WERE HERE>, ... (8 added)]} 0 1097                          
>                                                                
> May 12, 2010 2:35:35 PM org.apache.solr.core.SolrCore execute                 
>                                                                               
>           
> INFO: [] webapp=/solr path=/update params={wt=javabin&version=2.2} status=0 
> QTime=1097                                                                    
>             
> May 12, 2010 2:35:35 PM org.apache.solr.update.DirectUpdateHandler2 commit    
>                                                                               
>           
> INFO: start 
> commit(optimize=false,waitFlush=true,waitSearcher=true,expungeDeletes=false)  
>                                                                             
> May 12, 2010 2:35:35 PM org.apache.solr.core.SolrDeletionPolicy onCommit      
>                                                                               
>           
> INFO: SolrDeletionPolicy.onCommit: commits:num=2                              
>                                                                               
>           
>         
> commit{dir=/opt/apache/solr/data/index,segFN=segments_1,version=1273667628292,generation=1,filenames=[segments_1]
>                                              
>         
> commit{dir=/opt/apache/solr/data/index,segFN=segments_2,version=1273667628293,generation=2,filenames=[_0.tis,
>  _0.nrm, _0.fnm, _0.tvd, _0_1.del, _0.tvf, _0.tii, _0.tvx, _0.frq, 
> segments_2, _0.fdx, _0.prx, _0.fdt]                                           
>                                                                       
> May 12, 2010 2:35:35 PM org.apache.solr.core.SolrDeletionPolicy updateCommits 
>                                                                               
>           
> INFO: newest commit = 1273667628293                                           
>                                                                               
>           
> May 12, 2010 2:35:35 PM org.apache.solr.search.SolrIndexSearcher <init>       
>                                                                               
>           
> INFO: Opening searc...@8ae59a main                                            
>                                                                               
>           
> May 12, 2010 2:35:35 PM org.apache.solr.update.DirectUpdateHandler2 commit    
>                                                                               
>           
> INFO: end_commit_flush       

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