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From "Tom Beerbower (JIRA)" <>
Subject [jira] [Commented] (AMBARI-1442) Host Component metrics always showing zero values
Date Tue, 19 Feb 2013 14:13:14 GMT


Tom Beerbower commented on AMBARI-1442:

The decision to return temporal vs. point in time metrics is based on the query.  If a start
time/end time (seconds since epoch) /resolution are provided as part of the query then we
return temporal results.  The default is to return point in time metrics.

The "pointInTime" variable in the json files indicates whether or not point in time values
can be obtained for that metric.  The "temporal" variable indicates whether or not temporal
values can be obtained.  None of the metrics in the JMX file should be marked as "temporal"
: true.  All of the metrics in the Ganglia file should be marked as "temporal" : true.  Some
of the metrics in the Ganglia file are marked as "temporal" : true and "pointInTime" : true.
 It makes sense to get point in time values from Ganglia only when the metric is not available
through JMX and we want to return the last data point as the the point in time value.  For
example, ganglia_properties.json contains ...

If a request is made and no specific properties/metrics are specified ( same as fields=\*
) then each provider that is consulted will set all of the properties available to it on the
resource being returned.  For example, the JMX property provider will make a JMX request to
get the JMX data for the requested component.  It will populate the component resource to
be returned based on the data that it gets back, the properties specified in the jmx_properties.json
file and the properties specified in the request ( none in the case of fields=\* ).

> Host Component metrics always showing zero values
> -------------------------------------------------
>                 Key: AMBARI-1442
>                 URL:
>             Project: Ambari
>          Issue Type: Bug
>            Reporter: Tom Beerbower
>            Assignee: Tom Beerbower
>             Fix For: 1.2.2
>         Attachments: AMBARI-1442.patch
> In spite of the fact that some hadoop jobs that were performed, all fields of shuffle
metrics have 0.0 values.
> Used the following request to get shuffle metrics:
> {code}
> api/v1/clusters/clusterName/hosts/hostName/host_components/TASKTRACKER?fields=metrics/mapred/shuffleOutput
> {code}
> Result:
> {code}
> "metrics" : {
> "mapred" : {
> "shuffleOutput" :
> { "shuffle_success_outputs" : 0, "shuffle_handler_busy_percent" : 0, "shuffle_output_bytes"
: 0, "shuffle_failed_outputs" : 0, "shuffle_exceptions_caught" : 0 }
> }
> }
> {code}

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