java - 为什么我的 Cloud Run - 到 Firebase 调用需要这么长时间？

Question

我一直在尝试从 Cloud Run 中运行的 Java 应用程序连接到 Firebase 数据库。我的应用的 Firebase 事务的执行似乎有很多分钟的延迟(即使如此，我也没有得到所需的结果)。

当我的应用程序启动时，将调用以下方法:

    public void init() throws Exception {
        LOGGER.info("FirebaseRepo-init starting...");

        FileInputStream serviceAccount =
                  new FileInputStream("/MyDatabase.json");

        FirebaseOptions options = new FirebaseOptions.Builder()
                  .setCredentials(GoogleCredentials.fromStream(serviceAccount))
                  .setDatabaseUrl("https://mydatabase-222123.firebaseio.com")
                  .build();

        LOGGER.info("FirebaseRepo-init 1");

        fbApp = FirebaseApp.initializeApp(options);

        LOGGER.info("FirebaseRepo-init 2");

        dbRef = FirebaseDatabase.getInstance().getReference();

        LOGGER.info("FirebaseRepo-init 3");

        final DatabaseReference entityRef = dbRef.child("entities");

        LOGGER.info("FirebaseRepo-init 4");

        Entity e = testEntity();

        entityRef.runTransaction(new Transaction.Handler() {

            @Override
            public void onComplete(DatabaseError error, boolean committed, DataSnapshot currentData) {
                LOGGER.info("FirebaseRepo-init tx onComplete; com=" + committed + "; err=" + error);
            }

            @Override
            public Result doTransaction(MutableData data) {
                LOGGER.info("FirebaseRepo-init tx start");
                MutableData childData = data.child(e.getGuid().toString());
                if (childData != null) {
                    LOGGER.info("FirebaseRepo-init tx progress");
                    childData.setValue(e);
                } else {
                    LOGGER.info("FirebaseRepo-init tx null child");
                }
                LOGGER.info("FirebaseRepo-init tx will return");
                return Transaction.success(data);
            }
        });

        LOGGER.info("...FirebaseRepo-init ending");
    }

部署应用后检查日志，我们看到:

2020-03-30T01:51:40.318532ZINFO: FirebaseRepo-init starting...
2020-03-30T01:51:40.749160ZINFO: FirebaseRepo-init 1
2020-03-30T01:51:40.781135ZINFO: FirebaseRepo-init 2
2020-03-30T01:51:40.947959ZINFO: FirebaseRepo-init 3
2020-03-30T01:51:40.949045ZINFO: FirebaseRepo-init 4
2020-03-30T01:51:40.952295ZINFO: ...FirebaseRepo-init ending
2020-03-30T01:54:10.647748ZINFO: FirebaseRepo-init tx start
2020-03-30T01:54:10.945862ZINFO: FirebaseRepo-init tx progress
2020-03-30T01:54:12.546400ZINFO: FirebaseRepo-init tx will return
2020-03-30T01:56:03.046096ZINFO: FirebaseRepo-init tx start
2020-03-30T01:56:03.245789ZINFO: FirebaseRepo-init tx progress
2020-03-30T01:56:03.547215ZINFO: FirebaseRepo-init tx will return
2020-03-30T01:56:10.446070ZINFO: FirebaseRepo-init tx onComplete; com=true; err=null

该事务在应用程序启动后大约两分半钟被调用...然后大约五分钟后再次调用，最后完成。此外，当我转到 Firebase 仪表板时，我在数据库中看不到任何内容；尽管我没有看到任何错误报告，但没有添加任何内容。

对我所犯的 n00b 错误有什么想法吗？

Answer 1

考虑到问题中的评论，Cloud Run 似乎确实按预期工作，但是，Cloud Run 可能不是此特定用例的推荐产品。根据Doug的回答Cloud Run isn't meant to run arbitrary code on deployment. It's meant to run code in response to incoming HTTP requests as your run a web server on port 8080. ，这对于所面临的延迟来说是有意义的。可能值得检查其他产品。