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尝试安装 datastax opscenter - 无法加载应用程序：无法导入名称 _parse

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尝试安装 datastax opscenter - 无法加载应用程序：无法导入名称 _parse

我不熟悉 python，也许有人可以解释一下这里发生了什么？

ec2-user@prod-opscenter-01:~ % java -version
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)

ec2-user@prod-opscenter-01:~ % python -V
Python 2.6.8

ec2-user@prod-opscenter-01:~ % openssl version
OpenSSL 1.0.1e-fips 11 Feb 2013

现在错误

ec2-user@prod-opscenter-01:~ % sudo /etc/init.d/opscenterd start
Starting Cassandra cluster manager opscenterd
Starting opscenterdUnhandled Error
Traceback (most recent call last):
  File "/usr/lib64/python2.6/site-packages/twisted/application/app.py", line 652, in run
    runApp(config)
  File "/usr/lib64/python2.6/site-packages/twisted/scripts/twistd.py", line 23, in runApp
    _SomeApplicationRunner(config).run()
  File "/usr/lib64/python2.6/site-packages/twisted/application/app.py", line 386, in run
    self.application = self.createOrGetApplication()
  File "/usr/lib64/python2.6/site-packages/twisted/application/app.py", line 451, in createOrGetApplication
    application = getApplication(self.config, passphrase)
--- <exception caught here> ---
  File "/usr/lib64/python2.6/site-packages/twisted/application/app.py", line 462, in getApplication
    application = service.loadApplication(filename, style, passphrase)
  File "/usr/lib64/python2.6/site-packages/twisted/application/service.py", line 405, in loadApplication
    application = sob.loadValueFromFile(filename, 'application', passphrase)
  File "/usr/lib64/python2.6/site-packages/twisted/persisted/sob.py", line 210, in loadValueFromFile
    exec fileObj in d, d
  File "bin/start_opscenter.py", line 1, in <module>
    from opscenterd import opscenterd_tap
  File "/usr/lib/python2.6/site-packages/opscenterd/opscenterd_tap.py", line 37, in <module>

  File "/usr/lib/python2.6/site-packages/opscenterd/OpsCenterdService.py", line 13, in <module>

  File "/usr/lib/python2.6/site-packages/opscenterd/ClusterServices.py", line 22, in <module>

  File "/usr/lib/python2.6/site-packages/opscenterd/WebServer.py", line 40, in <module>

  File "/usr/lib/python2.6/site-packages/opscenterd/Agents.py", line 18, in <module>

exceptions.ImportError: cannot import name _parse

Failed to load application: cannot import name _parse

也许我应该看看监控 Cassandra 的开源替代品？

多谢

答案1

导致错误的行是from twisted.web.client import Agent, _parse。OpsCenter 将 twisted 版本与其发行版捆绑在一起，以确保正确的兼容性。听起来您在正在使用的系统上安装了不兼容的 twisted 版本。

编辑：Amazon Linux AMI 存在一个已知问题。在 /user/share/opscenter/bin/opscenter 中，在 export PYTHONPATH=... 之前添加以下行：PY_DISTRO="./lib/py-redhat/${PY_VER}/shared/${PY_ARCH}:./lib/py-redhat/${PY_VER‌​}/6/${PY_ARCH}"

我们必须研究如何在 OpsCenter 内部更好地处理这个问题，但与此同时，删除第三方安装的 twisted，虽然不太优雅，但肯定能让你启动并运行。

确定是否安装了扭曲或安装了在哪里： python -c "import twisted; print twisted"

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