Lior Yaffe created PDFBOX-4739:
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Summary: 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
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(0,
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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