CentOS7 安装CDH5.7.1 too many values to unpack 异常解决

too many values to unpack异常

[26/Feb/2019 23:39:00 +0000] 5852 MainThread agent        ERROR    Caught unexpected exception in main loop.
Traceback (most recent call last):
  File "/usr/lib64/cmf/agent/build/env/lib/python2.7/site-packages/cmf-5.7.1-py2.7.egg/cmf/agent.py", line 686, in start
    self._init_after_first_heartbeat_response(heartbeat_response["data"])
  File "/usr/lib64/cmf/agent/build/env/lib/python2.7/site-packages/cmf-5.7.1-py2.7.egg/cmf/agent.py", line 816, in _init_after_first_heartbeat_response
    self.client_configs.load()
  File "/usr/lib64/cmf/agent/build/env/lib/python2.7/site-packages/cmf-5.7.1-py2.7.egg/cmf/client_configs.py", line 682, in load
    new_deployed.update(self._lookup_alternatives(fname))
  File "/usr/lib64/cmf/agent/build/env/lib/python2.7/site-packages/cmf-5.7.1-py2.7.egg/cmf/client_configs.py", line 432, in _lookup_alternatives
    return self._parse_alternatives(alt_name, out)
  File "/usr/lib64/cmf/agent/build/env/lib/python2.7/site-packages/cmf-5.7.1-py2.7.egg/cmf/client_configs.py", line 444, in _parse_alternatives
    path, _, _, priority_str = line.rstrip().split(" ")
ValueError: too many values to unpack

这种错误是python脚本命令报出来的，指把值赋给一个tuple变量时，变量个数不够的情况下会报错。之前在CentOS 6 上安装的时候是不会报错的。网上说问题原因都是jdk版本冲突，openjdk没有卸载干净。解决方法也都是清理jdk。

但是我把除了oracle jdk以外的所有java和jdk全部删掉后还是一直报错，用命令强制全局指定java也不行。

alternatives --install /usr/bin/java java /usr/java/jdk1.8.0_152/bin/java 500

解决办法

根据错误提示，查看python脚本，/usr/lib64/cmf/agent/build/env/lib/python2.7/site-packages/cmf-5.7.1-py2.7.egg/cmf/client_configs.py 的444行，做如下修改：

442     for line in output.splitlines():
443       if line.startswith("/"):
444         path, _, _, priority_str = line.rstrip().split(" ")
445 
446         # Ignore the alternative if it's not managed by CM.
447         if CM_MAGIC_PREFIX not in os.path.basename(path):
448           continue
449 
450         try:
451           priority = int(priority_str)
452         except ValueError:
453           THROTTLED_LOG.info("Failed to parse %s: %s", name, line)
454 
455         key = ClientConfigKey(name, path)
456         value = ClientConfigValue(priority, self._read_generation(path))
457         ret[key] = value
458 
459     return ret

改成

442     for line in output.splitlines():
443       if line.startswith("/"):
444         if len(line.rstrip().split(" "))<=4:
445           path, _, _, priority_str = line.rstrip().split(" ")
446         
447           # Ignore the alternative if it's not managed by CM.
448           if CM_MAGIC_PREFIX not in os.path.basename(path):
449             continue
450         
451           try:
452             priority = int(priority_str)
453           except ValueError:
454             THROTTLED_LOG.info("Failed to parse %s: %s", name, line)
455         
456           key = ClientConfigKey(name, path)
457           value = ClientConfigValue(priority, self._read_generation(path))
458           ret[key] = value
459         else:
460           pass
461     return ret

问题成功解决