报错日志：
stderr:

Traceback (most recent call last):
File "/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/hdfs_client.py", line 73, in <module>
HdfsClient().execute()
File "/usr/lib/ambari-agent/lib/resource_management/libraries/script/script.py", line 375, in execute
method(env)
File "/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/hdfs_client.py", line 37, in install
self.install_packages(env)
File "/usr/lib/ambari-agent/lib/resource_management/libraries/script/script.py", line 821, in install_packages
retry_count=agent_stack_retry_count)
File "/usr/lib/ambari-agent/lib/resource_management/core/base.py", line 166, in __init__
self.env.run()
File "/usr/lib/ambari-agent/lib/resource_management/core/environment.py", line 160, in run
self.run_action(resource, action)
File "/usr/lib/ambari-agent/lib/resource_management/core/environment.py", line 124, in run_action
provider_action()
File "/usr/lib/ambari-agent/lib/resource_management/core/providers/package/__init__.py", line 53, in action_install
self.install_package(package_name, self.resource.use_repos, self.resource.skip_repos)
File "/usr/lib/ambari-agent/lib/resource_management/core/providers/package/yumrpm.py", line 264, in install_package
self.checked_call_with_retries(cmd, sudo=True, logoutput=self.get_logoutput())
File "/usr/lib/ambari-agent/lib/resource_management/core/providers/package/__init__.py", line 266, in checked_call_with_retries
return self._call_with_retries(cmd, is_checked=True, **kwargs)
File "/usr/lib/ambari-agent/lib/resource_management/core/providers/package/__init__.py", line 283, in _call_with_retries
code, out = func(cmd, **kwargs)
File "/usr/lib/ambari-agent/lib/resource_management/core/shell.py", line 72, in inner
result = function(command, **kwargs)
File "/usr/lib/ambari-agent/lib/resource_management/core/shell.py", line 102, in checked_call
tries=tries, try_sleep=try_sleep, timeout_kill_strategy=timeout_kill_strategy)
File "/usr/lib/ambari-agent/lib/resource_management/core/shell.py", line 150, in _call_wrapper
result = _call(command, **kwargs_copy)  	
File "/usr/lib/ambari-agent/lib/resource_management/core/shell.py", line 303, in _call
raise ExecutionFailed(err_msg, code, out, err)
resource_management.core.exceptions.ExecutionFailed: Execution of '/usr/bin/yum -d 0 -e 0 -y install snappy-devel' returned 1. Error: Package: snappy-devel-1.0.5-1.el6.x86_64 (HDP-UTILS-1.1.0.22)
       Requires: snappy(x86-64) = 1.0.5-1.el6
       Installed: snappy-1.1.0-1.el6.x86_64 (@anaconda-CentOS-201703281317.x86_64/6.9)
           snappy(x86-64) = 1.1.0-1.el6
       Available: snappy-1.0.5-1.el6.x86_64 (HDP-UTILS-1.1.0.22)
           snappy(x86-64) = 1.0.5-1.el6
You could try using --skip-broken to work around the problem
** Found 2 pre-existing rpmdb problem(s), 'yum check' output follows:
2:postfix-2.6.6-8.el6.x86_64 has missing requires of libmysqlclient.so.16()(64bit)
2:postfix-2.6.6-8.el6.x86_64 has missing requires of libmysqlclient.so.16(libmysqlclient_16)(64bit)

解决方案：

yum remove -y snappy 

yum install -y snappy-devel

重新安装HDFS