Aravindan Vijayan created AMBARI-23008:
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Summary: AMS: SUM downsampling function works incorrectly
Key: AMBARI-23008
URL: https://issues.apache.org/jira/browse/AMBARI-23008
Project: Ambari
Issue Type: Bug
Components: ambari-metrics
Reporter: Aravindan Vijayan
AMS, by default does not sum up across time dimension. However, there are
certain metric cases where this is useful.
*Aggregation Scenario - How it should work*
Let's say in Host H1 - the metric values for
'topology.streamline-2-test-clone.3-KAFKA.TASK1.--emit-count.STREAM1' are
1,1,0,1,2 in time 10:01 to 10:05 (1 minute values) respectively
And, in Host H2 - the metric values for the same metric are 1,0,2,2,1
respectively
AMS will first aggregate across hosts. 'Sum' aggregation -> 2,1,2,3,3 (10:01 -
10:05) and then across time (downsampling) for larger windows. In time based
downsampling, the 'sum' value will be 11 (2 + 1 + 2 + 3 + 3) at 10:05.
Also, such metrics should not be interpolated, because the injected values will
cause wrong summed up values.
* Work*
A new custom downsampler was added which implements the above logic.
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