Scylla无法使用Docker卷

克里斯·G

我正在使用Docker尝试Scylla,当我尝试使用以下卷启动容器时:

更新:仅在设置-developer-mode=0时运行,在设置运行--developer-mode 1就像错误消息中某处所说的那样。那么,性能有何不同?

docker run --name some-scylla -v $(pwd)/scylla:/var/lib/scylla -d scylladb/scylla --developer-mode=0

我收到以下错误:

 docker logs some-scylla
running: (['/usr/lib/scylla/scylla_dev_mode_setup', '--developer-mode', '0'],)
running: (['/usr/lib/scylla/scylla_io_setup'],)
Unexpected end of /proc/mounts line `overlay / overlay rw,relatime,lowerdir=/var/lib/docker/overlay2/l/4EW63UOV5QXIGGMQLID2222UKM:/var/lib/docker/overlay2/l/6XJRXN2HPJYCHXAGSSVWQ7LJM5:/var/lib/docker/overlay2/l/7RYKDGFWLSHQ5RNAQ7UIKI5D7I:/var/lib/docker/overlay2/l/GJCMLIFXUHTV5VL62MKFAXK4AF:/var/lib/docker/overlay2/l/URWQYQVXC7M5WACG5RLJXVXWKQ:/var/lib/docker/overlay2/l/Z7IZ43DGLAA4INFGTVAYIKM6OT:/var/lib/docker/overlay2/l/VH54CMJH4X3CA73VDJ63PA7SWD:/var/lib/docker/overlay2/l/4C7TNR7TY4F3QEOBOFCUBUJWGX:/var/lib/docker/overlay2/l/LNERBP5J7NDIO'
Unexpected end of /proc/mounts line `LH2VHSK2IDPTG:/var/lib/docker/overlay2/l/RNU5XYUHEFGGKKI2Z72VY6AFMR:/var/lib/docker/overlay2/l/62I7NFGNKNPMSYHM4SJOIZF3GE:/var/lib/docker/overlay2/l/ITSIUWLMY2ZDDWIYXHZN3OU3B5:/var/lib/docker/overlay2/l/NJZMNPZMNE4REV5ROKRYKALW66:/var/lib/docker/overlay2/l/6UZO7ISW4XSYPVRBAT2PWLDGTF:/var/lib/docker/overlay2/l/QHVAVYSQMYGUEE5WGGNNFBSKVF:/var/lib/docker/overlay2/l/EUSBWKEFMZRSXJ5OOMI7HC3B3V:/var/lib/docker/overlay2/l/QIJNRYNZVZ2RTON5CACSBQKSMA:/var/lib/docker/overlay2/l/PTQZWWDEG3ACWQMUYQ2V7QTVMS:/var/lib/do'
terminate called after throwing an instance of 'std::system_error'
  what():  open: No such file or directory
ERROR:root:/var/lib/scylla/data did not pass validation tests, it may not be on XFS and/or has limited disk space.
This is a non-supported setup, and performance is expected to be very bad.
For better performance, placing your data on XFS-formatted directories is required.
To override this error, enable developer mode as follow:
sudo /usr/lib/scylla/scylla_dev_mode_setup --developer-mode 1
failed!
Traceback (most recent call last):
  File "/docker-entrypoint.py", line 15, in <module>
    setup.io()
  File "/scyllasetup.py", line 33, in io
    self._run(['/usr/lib/scylla/scylla_io_setup'])
  File "/scyllasetup.py", line 22, in _run
    subprocess.check_call(*args, **kwargs)
  File "/usr/lib64/python3.4/subprocess.py", line 558, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/usr/lib/scylla/scylla_io_setup']' returned non-zero exit status 1

你知道为什么吗?

格劳伯·科斯塔

在启动之前,Scylla对您现有的I / O基础结构进行基准测试,并确定很多事情,例如:

  • 磁盘可以接受的并发请求的最大数量是多少
  • 异步操作的文件系统的性能如何

然后,该信息将馈送到Scylla的内部磁盘I / O调度程序,该程序用于在请求类别之间提供QoS。

Scylla的许多优点-如低延迟和不同I / O类之间的自动隔离,都可在功能正常的I / O调度程序中找到。

您看到的错误消息的发生是因为您的I / O层未通过基本验证测试,如以下消息所示: ERROR:root:/var/lib/scylla/data did not pass validation tests, it may not be on XFS and/or has limited disk space.

从其余的日志中,我想您正在使用docker的默认覆盖,而不是将外部XFS格式的磁盘传递给Scylla的推荐方法。

当您发现自己时,可以在中启动容器developer-mode这意味着Scylla的某些方面(如上所述)将无法正常运行,并且您将无法在数据库中享受最佳性能。

如果您不为此进行任何生产部署,而仅测试基本查询和测试应用程序,那么您就很好了。

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