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https://issues.apache.org/jira/browse/SOLR-1953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15967235#comment-15967235
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Markus Schuch edited comment on SOLR-1953 at 4/13/17 10:50 AM:
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We ran into this Issue with an Solr 4.x System and before finding this ticket i 
found FILEUPLOAD-189. So when someone wants to port the patch to older solr 
versions, you need also have a look to the commons-fileupload version.


was (Author: schuchm):
We ran into this Issue with an Solr 4.x System and before finding this ticket i 
found FILEUPLOAD-189 to be the root cause for this.

> It may be possible for temporary files to accumulator until the Solr process 
> is shut down
> -----------------------------------------------------------------------------------------
>
>                 Key: SOLR-1953
>                 URL: https://issues.apache.org/jira/browse/SOLR-1953
>             Project: Solr
>          Issue Type: Bug
>          Components: update
>    Affects Versions: 1.4.1, 1.5
>            Reporter: Karl Wright
>            Assignee: Mark Miller
>              Labels: file_leak, memory_leak
>             Fix For: 6.4, master (7.0)
>
>         Attachments: SOLR-1953.patch, SOLR-1953.patch, SOLR-1953.patch
>
>
> While researching SOLR-1951, the behavior of commons-fileupload in handling 
> multipart form posts came into question.  commons-fileupload creates a 
> temporary file for the main content area of such posts, and purportedly has a 
> background thread which cleans up these files.  However, Mark Miller 
> discovered that the javadoc in this matter may be incorrect, and that 
> commons-fileupload may in fact just be adding files to the JVM's list of 
> files needing cleanup on exit.
> If so, this will show up in two ways: first, temporary files will accumulate 
> in the java.io.tmpdir area.  Second, non-heap memory for the JVM will slowly 
> increase over time (since the file pointers the JVM tracks in this way are 
> not kept in the java heap).
> I will attach a potential fix; however, this ticket should be viewed as a 
> workitem for the need for further research in this area.



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