Is it possible for invoking a web service recursively in JavaScript to lead to a stack overflow issue

I am currently working on a migration procedure that may last between 2 to 3 days to complete. My concern is that the implementation I have in place could potentially result in a StackOverflow exception due to its recursive nature. I am questioning whether JavaScript generates a large stack to execute this code effectively. Considering that I will need to call this service approximately 10 million times, what would be a more efficient implementation that you would recommend?

function mainFunc() {
    var url = getMyUrl();
    $.ajax({
        url: url,
        type: "POST",
        contentType: "application/json;charset=utf-8",
        dataType: "json",
        success: function (remaining) {
            if(remaining > 0) {
               mainFunc();
            }
            else {
                alert('done');
            }
        },
        error: function (x, e) {
            alert('error!');
        }
    });
}

Answer №1

Initially, it seems inappropriate to execute this task within the browser; server-side processing would be more suitable.

Nevertheless, since your recursion is occurring asynchronously, a stack overflow is unlikely to occur. However, depending on your code (particularly which values are enclosed), memory usage may start to accumulate. Additionally, each call to mainFunc will result in the recreation of the success and error functions, adding to memory consumption.

To alleviate the memory allocation problem, you can define those functions outside of mainFunc and pass references to them within the function instead.

This adjustment does not guarantee immunity from potential memory issues. The outcome heavily relies on the specific code being executed and the references retained during each iteration.

To identify any resource retention causing delays during execution, one must either analyze the code for "leaks" or utilize memory profiling tools:

https://developer.chrome.com/devtools/docs/javascript-memory-profiling

Here's an example demonstrating the extraction of closures:

function mainFuncSuccess(remaining) {
    if(remaining > 0) {
       mainFunc();
    }
    else {
        alert('done');
    }
}


function mainFuncError() {
    alert('error!');
}

function mainFunc() {
        var url = getMyUrl();
        $.ajax({
            url: url,
            type: "POST",
            contentType: "application/json;charset=utf-8",
            dataType: "json",
            success: mainFuncSuccess,
            error: mainFuncError
        });
    }

Answer №2

Due to the asynchronous nature of $.ajax, the execution of the success function is delayed until the remote server provides a response. Essentially, after each iteration, the JavaScript engine will pause and wait for a response before continuing with the success function. This does not qualify as recursion. The stack size should remain relatively small regardless of how many iterations occur, unless there are other undisclosed factors contributing to the stack.

Answer №3

Incorrect, as there is no requirement to save any data within mainFunc for future use. The function's scope does not include any objects that must be retained.

To monitor memory usage in Chrome, utilize window.performance.memory

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