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https://issues.apache.org/jira/browse/SOLR-9934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15810624#comment-15810624
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David Smiley commented on SOLR-9934:
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+1 nice explanation and javadocs
> SolrTestCase.clearIndex should ensure IndexWriter.deleteAll is called
> ---------------------------------------------------------------------
>
> Key: SOLR-9934
> URL: https://issues.apache.org/jira/browse/SOLR-9934
> Project: Solr
> Issue Type: Test
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Hoss Man
> Assignee: Hoss Man
> Attachments: SOLR-9934.patch
>
>
> Normal deleteByQuery commands are subject to version constraint checks due to
> the possibility of out of order updates, but DUH2 has special support
> (triggered by {{version=-Long.MAX_VALUE}} for use by tests to override these
> version constraints and do a low level {{IndexWriter.deleteAll()}} call. A
> handful of tests override {{SolrTestCaseJ4.clearIndex()}} to take advantage
> of this (using copy/pasted impls), but given the intended purpose/usage of
> {{SolrTestCaseJ4.clearIndex()}}, it seems like the the base method in
> {{SolrTestCaseJ4}} should itself trigger this low level deletion, so tests
> get this behavior automatically.
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