[jira] [Commented] (AMBARI-13517) Ambari Server JVM crashed after several clicks in Web UI to navigate graph timerange

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

    [ https://issues.apache.org/jira/browse/AMBARI-13517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14984486#comment-14984486 ] 

Hudson commented on AMBARI-13517:
---------------------------------

FAILURE: Integrated in Ambari-trunk-Commit #3748 (See [https://builds.apache.org/job/Ambari-trunk-Commit/3748/])
AMBARI-13517. TimelineMetricsCache Unit test failure, apache infra. (swagle: [http://git-wip-us.apache.org/repos/asf?p=ambari.git&a=commit&h=8b0371bb76869d228c67c77d87ca621caf49453a])
* ambari-server/src/test/java/org/apache/ambari/server/controller/metrics/timeline/cache/TimelineMetricCacheSizingTest.java
* ambari-server/src/main/java/org/apache/ambari/server/configuration/Configuration.java
* ambari-server/src/main/java/org/apache/ambari/server/controller/metrics/timeline/cache/TimelineMetricCacheProvider.java


> Ambari Server JVM crashed after several clicks in Web UI to navigate graph timerange
> ------------------------------------------------------------------------------------
>
>                 Key: AMBARI-13517
>                 URL: https://issues.apache.org/jira/browse/AMBARI-13517
>             Project: Ambari
>          Issue Type: Bug
>          Components: ambari-server
>    Affects Versions: 2.1.2
>            Reporter: Siddharth Wagle
>            Assignee: Siddharth Wagle
>            Priority: Critical
>             Fix For: 2.1.3
>
>
> - Max Heap restriction problem: Ehcache library that we use has a limit of how far in the object graph it traverses to find size of an Cached reference, this is to make it performant. Default limit = 1000.
> - User gets following Warning which are harmless unless the data cannot fit in memory and eviction does not kick in:
> {code}
> WARN [qtp-client-70] ObjectGraphWalker:209 - The configured limit of 1,000 object references was reached while attempting to calculate the size of the object graph. Severe performance degradation could occur 
> if the sizing operation continues. This can be avoided by setting the CacheManger or Cache <sizeOfPolicy> elements maxDepthExceededBehavior to "abort" or adding stop points with @IgnoreSizeOf annotations. If performance degradation 
> is NOT an issue at the configured limit, raise the limit value using the CacheManager or Cache <sizeOfPolicy> elements maxDepth attribute. For more information, see the Ehcache configuration documentation.
> {code}
> _Objective of the patch_:
> - Provide a custom Sizing engine for Ehcache that will provide a close approximation of the data in the cache with significant perf gain. Premise: Since we know the data structures we can make better estimates.
> - Expectation from sizing engine : Discrepancy of less than 10K for a DS of size 10 MB (Proven with a unit test)



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