[jira] [Reopened] (PDFBOX-4739) Memory issues when rendering pdf to image

["Tilman Hausherr (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PDFBOX-4739?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tilman Hausherr reopened PDFBOX-4739:
-------------------------------------

> Memory issues when rendering pdf to image
> -----------------------------------------
>
>                 Key: PDFBOX-4739
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4739
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Rendering
>    Affects Versions: 2.0.18
>            Reporter: Lior Yaffe
>            Priority: Blocker
>              Labels: how-to
>         Attachments: linkedinceoresume.pdf
>
>
> So I'm trying to write a web service which performs OCR on an input pdf files.
> The code is very simple - convert the pdf to tiff files using PDFBox, and then use tesseract on the tiff files to get text.
> code is very straight forward:
>  
> {code:java}
> private List<ByteArrayOutputStream> convertPdfToTiff2() throws IOException {
>     List<ByteArrayOutputStream> fileList = new ArrayList<>();
>     PDDocument doc = PDDocument.load(this.bytes);
>     doc.setResourceCache(new EmptyCache());
>     try {
>         PDFRenderer pdfRenderer = new PDFRenderer(doc);
>         for (int page = 0; page < doc.getNumberOfPages(); ++page) {
>             BufferedImage bufferedImage = pdfRenderer.renderImageWithDPI(page, 300, ImageType.RGB);
>             calcImageSize(bufferedImage);
>             ByteArrayOutputStream os = new ByteArrayOutputStream();
>             ImageIO.write(bufferedImage, "tiff", os);
>             os.flush();
>             os.close();
>             bufferedImage.flush();
>             bufferedImage = null;
>             fileList.add(os);
>         }
>     } finally {
>         doc.close();
>     }
>     return fileList;
> }
> {code}
>  
> I'm trying to run a sample test which runs this concurrent with 5-6 different threads, but the app is crashing very fast.
>  
> I did some memory tests, and it seems that while the input file is around 70 kb, the 
> {code:java}
> pdfRenderer
> {code}
> object is around 300 MB!! no matter if i'm changing the DPI level, the object is still very large.
> in addition, only if I'm calling the GC I see the memory drops, even if I'm closing the doc object....
>  
> Basically when I'm running my server with -Xmx6GB with 6 threads in concurrent, after 3 runs the service is crashing....what am I missing here?
>  
>  * I attached the input pdf file
>  



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