-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/40270/
-----------------------------------------------------------
Review request for Ambari, Dmytro Sen, Sumit Mohanty, and Sid Wagle.
Bugs: AMBARI-13863
https://issues.apache.org/jira/browse/AMBARI-13863
Repository: ambari
Description
-------
Problem
On the Ambari dashboard page, when different time ranges are randomly chosen,
the metrics charts stop responding and an OutOfMemory is seen in the Ambari
server logs.
Bug
In the AMS cache layer, the logic to pad the cache entry map by looking at the
delta between the values present in the map. When there is only one data point,
it assumes a default pad interval of 15 seconds even if the actual data
precision could be in minutes/hours/days.
Fix
Change the padding interval logic to use the precision calculated using the
requested start and end time. If the precision is in SECONDS, the delta between
the values in the map are used.
Diffs
-----
ambari-server/src/main/java/org/apache/ambari/server/controller/metrics/MetricsPaddingMethod.java
ccfb713
ambari-server/src/test/java/org/apache/ambari/server/controller/metrics/timeline/MetricsPaddingMethodTest.java
b35295d
Diff: https://reviews.apache.org/r/40270/diff/
Testing
-------
Added unit test for new padding interval calculation method. Relevant unit
tests pass.
Submitted a patch at Apache to run other unit tests.
Thanks,
Aravindan Vijayan
