由于 "too much memory"，App Engine 进程随机终止

Question

在过去的一年里，我一直在使用 google App Engine 制作 PDF，然后将它们输出到页面上。直到今天，他们一直在完美地工作。

现在，我收到以下错误 - 并非总是如此，但可能有大约 40% 的请求返回时出现了关于它被终止的 500 错误。

有谁知道为什么会发生这种情况以及如何避免这种情况？

While handling this request, the process that handled this request was found to be using too much memory and was terminated. This is likely to cause a new process to be used for the next request to your application. If you see this message frequently, you may have a memory leak in your application.

这是我的脚本。有时我使用 $pdf->MemImage(); 向其中添加图像或者我用 $pdf->Cell() 添加文本，但这是唯一的区别。

<?php
    define('FPDF_FONTPATH','lib/fpdi/fonts');
    require_once('lib/fpdf.php');
    require_once('lib/fpdi/fpdi.php');

    $pdfPath = file_get_contents("gs://bucket/template.pdf");
    $temp_id = "12345";
    $max_pages = 5;

    //put the pdf image into a temp directory in google drive
    $object_url = "gs://bucket2/template.pdf";
    file_put_contents($object_url, $pdfPath);

    //Start the FPDI
    $pdf = new FPDI('P', 'pt');
    $pdf->SetAutoPageBreak(false);

    //Set the source PDF file
    $source_file = $pdf->setSourceFile("gs://bucket2/template.pdf");

    for($page_count = 1; $page_count <= $max_pages; $page_count++)
    {
        //Import the first page of the file
        $tppl = $pdf->importPage($page_count);
        $pdf->AddPage();

        //get size of pdf page
        $size = $pdf->getTemplateSize($tppl);

        $pdf->useTemplate($tppl, null, null, $size['w'], $size['h'], true);
    }

    header('Content-Type: application/pdf');
    $pdf->Output("template.pdf", "I");
    unlink("gs://bucket2/template.pdf");
?>

Answer 1

我通过更新实例 class 和 app.yaml 中的基本缩放解决了这个问题。这只是实验，可能需要根据用例而有所不同，但它确实为我解决了问题。感谢所有在上述评论中提供帮助的人。

application: <APPLICATION NAME>
version: 1
runtime: php55
api_version: 1
instance_class: B2
basic_scaling:
  max_instances: 5

由于 "too much memory"，App Engine 进程随机终止

App Engine Process randomly terminated because of "too much memory"

php

pdf

google-app-engine

fpdf

fpdi