[jira] [Commented] (PDFBOX-4035) Render PDF to image may be cause OOM

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

    [ https://issues.apache.org/jira/browse/PDFBOX-4035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16292098#comment-16292098 ] 

Tilman Hausherr commented on PDFBOX-4035:
-----------------------------------------

Please use the latest version, and read this:
https://pdfbox.apache.org/2.0/faq.html#outofmemoryerror

and also this:
https://pdfbox.apache.org/2.0/getting-started.html
which may prevent PDFs from taking too long to render, thus resulting in tasks running in parallel if the page takes longer than 5 minutes

> Render PDF to image may be cause OOM
> ------------------------------------
>
>                 Key: PDFBOX-4035
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4035
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: Rendering
>    Affects Versions: 2.0.7
>         Environment: Mac os 10.13.2
> Ubuntu 16.04.2 LTS
>            Reporter: Liu KeFeng
>
> My project need render every pdf page to image, and use scale.
> This is my code:
> {code:java}
>   public void pdfToImage(String uuid, String date, String pdfFileLocation, String saveParentFolder) {
>     File pdfFile = new File(pdfFileLocation);
>     try (PDDocument doc = PDDocument.load(pdfFile, MemoryUsageSetting.setupTempFileOnly())) {
>       PDFRenderer renderer = new PDFRenderer(doc);
>       int page = doc.getNumberOfPages();
>       String imagePath = saveParentFolder + "/" + date + "/" + uuid + "/";
>       File folder = new File(imagePath);
>       if (!folder.exists() && !folder.mkdirs()) {
>         throw new IllegalStateException("create directory " + imagePath + " error");
>       }
>       for (int i = 0; i < page; i++) {
>         int subPage = i;
>         Future<Void> future = callerRunExecutor.submit(() -> {
>           BufferedImage image = renderer.renderImageWithDPI(subPage, 220);
>           String imageLocation = imagePath + (subPage + 1) + appProperties.folderPath.previewImageSuffix;
>           writeImage(image, imageLocation);
>           return null;
>         });
>         try {
>           future.get(5L, TimeUnit.MINUTES);
>         } catch (InterruptedException | ExecutionException | TimeoutException e) {
>           LOGGER.warn("generate " + pdfFileLocation + " page of  " + subPage + " preview image error.", e);
>         }
>       }
>     } catch (IOException e) {
>       throw new ApiException(GatewayError.INTERNAL_ERROR, e);
>     }
>   }
> {code}
> This code maybe cause OOM. The PDFBox class is DCTFilter, source code:
> {code:java}
> DataBufferByte dataBuffer = (DataBufferByte)raster.getDataBuffer();
> {code}
> The pdf only have one page, the page only have one image, the image size: 13653 * 18000,
> When rendering the image, trigger the user code, the user to choose whether to render, how to render.



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