[jira] [Created] (AMBARI-14007) Fix precision issues in AMS.

["Aravindan Vijayan (JIRA)" <ji...@apache.org>]

Aravindan Vijayan created AMBARI-14007:
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             Summary: Fix precision issues in AMS.
                 Key: AMBARI-14007
                 URL: https://issues.apache.org/jira/browse/AMBARI-14007
             Project: Ambari
          Issue Type: Bug
    Affects Versions: 2.1.2
            Reporter: Aravindan Vijayan
            Assignee: Aravindan Vijayan
            Priority: Critical
             Fix For: 2.1.3


Problem
The following error is seen in the ambari server log when different time periods are selected in the Host page.

19 Nov 2015 22:27:50,476 ERROR [qtp-client-79] MetricsRequestHelper:96 - Error getting timeline metrics : {"exception":"BadRequestException","message":"java.lang.Exception: Requested precision (SECONDS) for given time range causes result set size of 15840, which exceeds the limit - 11520. Please request higher precision.","javaClassName":"org.apache.hadoop.yarn.webapp.BadRequestException"}

Bug
The default metric service result limit of 11520 was not able to satisfy a couple of specific cases of 22 host metrics requested for 2 hours in SECONDS precision.

Fix
Change default limit to15840. Covers all time periods of all metric charts in Ambari web. Introduce a simple 1 time retry mechanism in Ambari server according to which the server retries AMS with the same request with higher precision if a request fails due to PrecisionLimitExceededException.



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