javascript - 文件系统读/写 : Is this a race condition?

Question

import {appendFile, readFile} from 'fs'

// Read data from an Apache server's access log
readFile(
  '/var/log/apache2/access_log',
  {encoding: 'utf8'},
  (error, data) => {
    if (error) {
      console.error('error reading!', error)
      return
    }
    console.info('success reading!', data)
  }
)

// Concurrently, write data to the same access log
appendFile(
  '/var/log/apache2/access_log',
  'New access log entry',
  error => {
    if (error) {
      console.error('error writing!', error)
    }
  })

是否保证读取会在 appendFile 写入文件系统之前完成，或者我的数据是否可能在 readFile 完成之前附加，以便readFile 返回我新追加的数据？

Answer 1

快速测试一下，它确实不稳定:

https://gist.github.com/bcherny/029473f21833a73126d2e1dce53f2a6a