[jira] [Created] (AMBARI-20754) get_value_from_jmx constantly prints exception message in retry mechanism, which brings bad user experience

["Yuanbo Liu (JIRA)" <ji...@apache.org>]

Yuanbo Liu created AMBARI-20754:
-----------------------------------

             Summary: get_value_from_jmx constantly prints exception message in retry mechanism, which brings bad user experience
                 Key: AMBARI-20754
                 URL: https://issues.apache.org/jira/browse/AMBARI-20754
             Project: Ambari
          Issue Type: Bug
            Reporter: Yuanbo Liu
            Assignee: Yuanbo Liu


{{get_value_from_jmx}} of {{jmx.py}} is used in getting NameNode HA state. As we know, if the cluster is large, it takes a long time for Namenode to leave safe mode when restarting Namenode, thus we use retry mechanism to invoke {{get_value_from_jmx}} in case of getting wrong state. The problem is that, {{get_value_from_jmx}} will print several exception message into std_error during retrying, it confuses users because there're error messages in std_error, while all the services restart successfully. Here are the error messages:

{quote}
2017-04-12 15:12:56,633 - Getting jmx metrics from NN failed. URL: http://xxxx:50070/jmx?qry=Hadoop:service=NameNode,name=FSNamesystem
Traceback (most recent call last):
File "/usr/lib/python2.6/site-packages/resource_management/libraries/functions/jmx.py", line 38, in get_value_from_jmx
   _, data, _ = get_user_call_output(cmd, user=run_user, quiet=False)
File "/usr/lib/python2.6/site-packages/resource_management/libraries/functions/get_user_call_output.py", line 61, in get_user_call_output
   raise ExecutionFailed(err_msg, code, files_output[0], files_output[1])
ExecutionFailed: Execution of 'curl --negotiate -u : -s 'http://xxxx:50070/jmx?qry=Hadoop:service=NameNode,name=FSNamesystem' 1>/tmp/tmpWp05DF 2>/tmp/tmphm2dny' returned 7.

2017-04-12 15:12:58,562 - Getting jmx metrics from NN failed. URL: http://xxxx:50070/jmx?qry=Hadoop:service=NameNode,name=FSNamesystem
Traceback (most recent call last):
File "/usr/lib/python2.6/site-packages/resource_management/libraries/functions/jmx.py", line 42, in get_value_from_jmx
   return data_dict["beans"][0][property]
IndexError: list index out of range
{quote}
We should improve it.




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