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https://issues.apache.org/jira/browse/SOLR-4732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13634531#comment-13634531
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Shawn Heisey commented on SOLR-4732:
------------------------------------
This is the solr.xml the user had, on Solr 3.5:
{noformat}
<?xml version="1.0" encoding="UTF-8" ?>
<solr persistent="true">
<cores adminPath="/admin/cores">
<core name="default" instanceDir="./"/>
<core name="413a" instanceDir="./"/>
<core name="blah" instanceDir="./"/>
...
</cores>
</solr>
{noformat}
> CoreAdmin - SWAP and RENAME with shared instanceDir and no dataDir - problems
> after Solr restart
> ------------------------------------------------------------------------------------------------
>
> Key: SOLR-4732
> URL: https://issues.apache.org/jira/browse/SOLR-4732
> Project: Solr
> Issue Type: Bug
> Affects Versions: 3.5
> Reporter: Shawn Heisey
> Fix For: 4.3
>
>
> If your cores share an instanceDir but dataDir is not explicitly defined in
> solr.xml, apparently dataDir is not "./data" as it would be when instanceDir
> is not shared, it becomes (or includes) the name of the core as well. This
> results in problems problems with RENAME, and probably SWAP as well.
> The RENAME will work, with the dataDir still retaining the old name. When
> you restart Solr, however, the core will use the new name for the dataDir and
> create an empty index, ignoring the old one. Based on this behavior, I
> believe that if you did a SWAP, after reload the cores would no longer be
> swapped.
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