yiisoft/yii2

Server suddenly returns error code 500

It is found that the IO speed of the hard disk of the php-fpm process is 130Mb/s , and the corresponding file is /runtime/logs/app.log

main.php

'log' => [
    'traceLevel' => YII_DEBUG ? 3 : 0,
        'targets' => [
        [
            'class' => 'yii\log\FileTarget',
            'levels' => ['info','error', 'warning'],
            'logVars' => ['_GET','_POST'],//记录全局变量的参数，$_GET,$_SERVER...,默认会增加一条info记录
            'logFile' => '@app/runtime/logs/-app.log',
            'maxFileSize' => 1024 * 2000,       // 2G
            'maxLogFiles' => 1,
        ]
    ],
],

When I read the source code in vendor/yiisoft/yii2/log/FileTarget.php, I found that I should set rotateByCopy = false.

file:vendor/yiisoft/yii2/log/FileTarget.php

/**
* @var bool Whether to rotate log files by copy and truncate in contrast to rotation by
* renaming files. Defaults to `true` to be more compatible with log tailers and is windows
* systems which do not play well with rename on open files. Rotation by renaming however is 
* a bit faster.
*
* The problem with windows systems where the [rename()](https://secure.php.net/manual/en/function.rename.php)
* function does not work with files that are opened by some process is described in a
* [comment by Martin Pelletier](https://secure.php.net/manual/en/function.rename.php#102274) in
* the PHP documentation. By setting rotateByCopy to `true` you can work
* around this problem.
*/
public $rotateByCopy = true;

But I don't think this configuration will cause the server to stop serving.Then I found a bit of confusion.

file:vendor/yiisoft/yii2/log/FileTarget.php

    public function export()
    {
        $logPath = dirname($this->logFile);
        FileHelper::createDirectory($logPath, $this->dirMode, true);

        $text = implode("\n", array_map([$this, 'formatMessage'], $this->messages)) . "\n";
        if (($fp = @fopen($this->logFile, 'a')) === false) {
            throw new InvalidConfigException("Unable to append to log file: {$this->logFile}");
        }
        @flock($fp, LOCK_EX);   ########### lock file
        if ($this->enableRotation) {
            clearstatcache();
        }
        if ($this->enableRotation && @filesize($this->logFile) > $this->maxFileSize * 1024) {
            @flock($fp, LOCK_UN);   ########### unlock file
            @fclose($fp);
            $this->rotateFiles();   ########### when rotateByCopy = true , copying file content to aother file is slow (2GB size). Causes multiple php-fpm processes copy files at the same time
            ########### Why unlock file before rotateFiles() @see:https://github.com/yiisoft/yii2/pull/3563#issuecomment-425630598
            ########### Maybe we need a separate lock file for rotateFiles().
            // ...
        } else {
            // ...
        }
        // ...
    }

Is my idea right?