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https://issues.apache.org/jira/browse/SOLR-1822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12846099#action_12846099
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Otis Gospodnetic commented on SOLR-1822:
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When Solr starts, doesn't it create the index directory?  If so, this patch is 
not needed, unless we want to make sure replication succeeds even if 
someone/something removes the whole index directory on a slave after the slave 
had already started.

Is this reeeeally needed?

> SEVERE: Unable to move index file from: tempfile to: indexfile
> --------------------------------------------------------------
>
>                 Key: SOLR-1822
>                 URL: https://issues.apache.org/jira/browse/SOLR-1822
>             Project: Solr
>          Issue Type: Bug
>          Components: replication (java)
>    Affects Versions: 1.4
>         Environment: Linux, JDK6,SOLR 1.4
>            Reporter: wyhw whon
>            Priority: Critical
>             Fix For: 1.5
>
>         Attachments: SnapPuller.patch
>
>
> SOLR index directory remvoed,but do not know what the reasons for this.
> I add some codes on SnapPuller.java 577 line can reslove this bug.
> line 576                           
> File indexFileInIndex = new File(indexDir, fname);
> +
> if (!indexDir.exists()) indexDir.mkdir();
> boolean success = indexFileInTmpDir.renameTo(indexFileInIndex);

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