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https://issues.apache.org/jira/browse/SOLR-9398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15413673#comment-15413673
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Shawn Heisey commented on SOLR-9398:
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I do not know if the problem here is in Solr or Lucene. The issue might need
to change projects.
> deleteByQuery blocks during an optimize
> ---------------------------------------
>
> Key: SOLR-9398
> URL: https://issues.apache.org/jira/browse/SOLR-9398
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 5.3.2
> Reporter: Shawn Heisey
>
> When merging is happening, particularly if it's an optimize, a deleteByQuery
> update request will block until the merge is complete. Any other change to
> the index is also blocked by the delete.
> If a query with fl set to the uniqueKey is made, then the list of IDs
> received from that query is submitted as a delete by ID, then there's no
> problem. This suggests that it is probably possible to fix this.
> I know for sure that this affects 5.3.2, and I think it likely affects all
> 6.x versions too. I don't have any large indexes on anything newer than
> 5.3.2.
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