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https://issues.apache.org/jira/browse/AMBARI-20754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15996743#comment-15996743
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Yuanbo Liu commented on AMBARI-20754:
-------------------------------------
[~dili] Can we backport this JIRA into 2.5. We have a such kind of defect to
fix in next version.
> 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
> Fix For: trunk
>
> Attachments: AMBARI-20754.001.patch
>
>
> {{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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