It may be possible for temporary files to accumulator until the Solr process is 
shut down
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                 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


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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