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https://issues.apache.org/jira/browse/FOP-2189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13556165#comment-13556165
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Joey Ezekiel commented on FOP-2189:
-----------------------------------

Unfortunately we do not have lsof installed, but I'll try getting it. The thing 
that puzzles me is that the same threads with the same code are used to create 
the AFP files too. And it does - like a charm.
                
> 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
>
> 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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