[jira] [Created] (AMBARI-13863) UI lags and OutOfMemoryError seen in Ambari server after dashboard metrics change.

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

Aravindan Vijayan created AMBARI-13863:
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             Summary: UI lags and OutOfMemoryError seen in Ambari server after dashboard metrics change.
                 Key: AMBARI-13863
                 URL: https://issues.apache.org/jira/browse/AMBARI-13863
             Project: Ambari
          Issue Type: Bug
          Components: ambari-metrics
    Affects Versions: 2.1.2
            Reporter: Aravindan Vijayan
            Assignee: Aravindan Vijayan
            Priority: Critical
             Fix For: 2.1.3


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 update the cache entry map by removing values outside the given requested time range eventually leads to memory leak.

Fix
Change the logic to explicitly by using the iterator.remove() to remove the entries instead of using the map.clear() method.



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