Joey Ezekiel created FOP-2189:

             Summary: Apache FOP 1.0 Multithreading Problems - Too many open 
files err24
                 Key: FOP-2189
             Project: Fop
          Issue Type: Bug
          Components: pdf
    Affects Versions: 1.0
         Environment: HP Unix 
            Reporter: Joey Ezekiel

We use Apache FOP to convert a whole lot of XML's to AFP's and PDF's. Our 
current load would be around 25k files per run on a HP-UX system. We have 12 
threads in total that are used to initialize and trigger the FOP conversion in 
a producer-consumer fashion. Recently there have been multiple failures during 
conversion and when looked up, we've received generic FOP errors like:

**ERROR,2460364,FOToPDF_Thread_11,FOP Exception, something.pdf,Failed to 
resolve font with embed-url './Fonts/arial.ttf'**

or its an error failing to load the font metrics file although the files are 
intact with the right permissions. Many other PDF's are generated so this can't 
be the problem.

We also wind up with:
** /PDF/20130111130002/something.pdf (Too many 
open files (errno:24))**

judging by the logs and volume being processed, this looks like an FOP problem. 
I've read that FOP has had this issue in the past with the font files. There 
have been instances where Apache has opened each font file multiple times and 
not closed the handles resulting in a large number of open files. This was 
supposed to be fixed, but if it still persists, what would be a good and quick 
solution to this?

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