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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