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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMBARI-15892) Incorrect (Negative) values are shown for memory metrics
Date Thu, 21 Apr 2016 23:09:12 GMT

    [ https://issues.apache.org/jira/browse/AMBARI-15892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15252973#comment-15252973
] 

Hadoop QA commented on AMBARI-15892:
------------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12800031/AMBARI-15892-2.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in ambari-server.

Test results: https://builds.apache.org/job/Ambari-trunk-test-patch/6592//testReport/
Console output: https://builds.apache.org/job/Ambari-trunk-test-patch/6592//console

This message is automatically generated.

> Incorrect (Negative) values are shown for memory metrics
> --------------------------------------------------------
>
>                 Key: AMBARI-15892
>                 URL: https://issues.apache.org/jira/browse/AMBARI-15892
>             Project: Ambari
>          Issue Type: Bug
>            Reporter: Aravindan Vijayan
>            Assignee: Aravindan Vijayan
>            Priority: Blocker
>         Attachments: AMBARI-15892-2.patch, AMBARI-15892.patch
>
>
> Issue
> In the "NameNode HostLoad" graph, the negative values are seen for the computed metric
"Memory Utilization" which goes by the formula :
> ( mem_total - (mem_free + mem_cache) ) *100 / mem_total
> Bug
> AMBARI-15448 changed the way memory metrics are being reported to AMS. This lead to a
double subtraction of mem_cached, thereby leading to a negative value intermittently. 
> Fix
> Change the widget to :
> ( mem_total - mem_free ) *100 / mem_total



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