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From "Andrii Babiichuk (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMBARI-13945) Missing HDFS tag.HAState JMX Metric Causes JavaScript Errors
Date Wed, 18 Nov 2015 15:53:11 GMT

    [ https://issues.apache.org/jira/browse/AMBARI-13945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15011247#comment-15011247
] 

Andrii Babiichuk commented on AMBARI-13945:
-------------------------------------------

+1 for the patch

> Missing HDFS tag.HAState JMX Metric Causes JavaScript Errors
> ------------------------------------------------------------
>
>                 Key: AMBARI-13945
>                 URL: https://issues.apache.org/jira/browse/AMBARI-13945
>             Project: Ambari
>          Issue Type: Bug
>          Components: ambari-web
>    Affects Versions: 2.1.0
>            Reporter: Aleksandr Kovalenko
>            Assignee: Aleksandr Kovalenko
>            Priority: Critical
>             Fix For: 2.1.3
>
>         Attachments: AMBARI-13945.patch
>
>
> If the {{HAState}} metric is not returned as part of the {{metrics/dfs}} for a host component,
then the Ambari Web Client with produce a JavaScript error on the HDFS page and prevent it
from loading properly. Many actions will be unavailable, such as restart.
> My assessment of this was that the web client was asking the Ambari server to get information
on the NameNode components - it needs to check if the HA state was ACTIVE or STANDBY.
> We convert this from a JMX metric into an ambari metric:
> {code:title=HDFS/metrics.json}
>             "metrics/dfs/FSNamesystem/HAState": {
>               "metric": "Hadoop:service=NameNode,name=FSNamesystem.tag#HAState",
>               "pointInTime": true,
>               "temporal": false
>             },
> {code}
> So that the {{FSNamesystem/tag.HAState}} is converted into {{metrics/dfs/FSNameSystem/HAState}}.
> The problem here seemed to be that one of the HDFS NN's didn't include {{tag.HAState}}
in its JMX. Because of that, the Ambari metric was missing which caused a JavaScript dereference
error in the web client.
> The problem originated in HDFS, but the web client should probably have a bug filed to
check its JSON before de-referencing. I can file that bug tomorrow.



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