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https://issues.apache.org/jira/browse/SOLR-3559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13406659#comment-13406659
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Yonik Seeley commented on SOLR-3559:
------------------------------------

OK, I think I finally nailed the last bug in this.  DBQ needs to clear *all* 
maps in the update log (i.e. prevMap, prevMap2) otherwise lookups can get a 
false hit during a concurrent commit.
                
> handle deleteByQuery reorders in distributed indexing
> -----------------------------------------------------
>
>                 Key: SOLR-3559
>                 URL: https://issues.apache.org/jira/browse/SOLR-3559
>             Project: Solr
>          Issue Type: Improvement
>          Components: SolrCloud
>            Reporter: Yonik Seeley
>            Assignee: Yonik Seeley
>         Attachments: SOLR-3559.patch, SOLR-3559.patch, SOLR-3559.patch, 
> SOLR-3559.patch, SOLR-3559.patch
>
>
> We currently handle other update reorders (i.e. replica A may see update X 
> then Y, and replica B may see update Y then X).  deleteByQuery also needs to 
> handle reorders to ensure replicas are consistent.

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