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https://issues.apache.org/jira/browse/AMBARI-18427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15514814#comment-15514814
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Hajime Osako commented on AMBARI-18427:
---------------------------------------

FYI, I had same issue and the cause was 
/usr/lib/python2.6/site-packages/ambari_commons was a symlink to 
ambari-server's one.
Uninstall ambari-server, removing /usr/lib/python2.6/site-packages/ambari_*, 
then "yum reinstall ambari-agent" worked for me.

> Agent 2.4.0.1 start error "cannot import name split_on_chunks" after upgrade
> ----------------------------------------------------------------------------
>
>                 Key: AMBARI-18427
>                 URL: https://issues.apache.org/jira/browse/AMBARI-18427
>             Project: Ambari
>          Issue Type: Bug
>          Components: ambari-agent
>    Affects Versions: 2.4.0
>         Environment: HDP 2.3
>            Reporter: Hari Sekhon
>            Priority: Blocker
>
> I hit this issue yesterday after upgrading ambari-agent:
> {code}
> Verifying Python version compatibility...
> Using python  /usr/bin/pythonChecking for previously running Ambari Agent...
> Starting ambari-agentVerifying ambari-agent process status...
> ERROR: ambari-agent start failed. For more details, see 
> /var/log/ambari-agent/ambari-agent.out:
> ====================
> Traceback (most recent call last):  
>    File "/usr/lib/python2.6/site-packages/ambari_agent/AmbariAgent.py", line 
> 24, in <module>  from Controller import AGENT_AUTO_RESTART_EXIT_CODE  
>    File "/usr/lib/python2.6/site-packages/ambari_agent/Controller.py", line 
> 41, in <module>  from ambari_agent.ActionQueue import ActionQueue  
>    File "/usr/lib/python2.6/site-packages/ambari_agent/ActionQueue.py", line 
> 37, in <module>  from ambari_commons.str_utils import split_on_chunks
> ImportError: cannot import name split_on_chunks
> ====================
> {code}
> I'm not the first person to have encountered it, see:
> https://community.hortonworks.com/questions/55968/ambari-agent-start-failed-2.html
> Considering this is an existing cluster the solution of rm -rf'ing the entire 
> python2.6 site-packages seems excessive...



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