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https://issues.apache.org/jira/browse/FOP-2189?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joey Ezekiel reopened FOP-2189:
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Picking up from my earlier issue, I have now used HP-UX's tusc utility (similar 
to lsof) to monitor the system calls (open/close file handles in specific) and 
I've noticed that certain image resources (.tif) files are left open. I've used 
the image cache listener to track the loading/pre-loading of images and the 
cache is working fine. The issue is that the last system file open call to any 
particular image (.tif in this case) is being left open and not being closed
                
> Apache FOP 1.0 Multithreading Problems - Too many open files err24
> ------------------------------------------------------------------
>
>                 Key: FOP-2189
>                 URL: https://issues.apache.org/jira/browse/FOP-2189
>             Project: Fop
>          Issue Type: Bug
>          Components: pdf
>    Affects Versions: 1.0
>         Environment: HP Unix 
>            Reporter: Joey Ezekiel
>              Labels: Exception, Font", IOException, PDF, error
>             Fix For: trunk
>
>
> 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:
> **java.io.FileNotFoundException: /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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