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https://reviews.apache.org/r/45834/
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Review request for Ambari, Alejandro Fernandez, Dmitro Lisnichenko, and Nate 
Cole.


Bugs: AMBARI-15745
    https://issues.apache.org/jira/browse/AMBARI-15745


Repository: ambari


Description
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There are many factors which can influence the response rate of the REST API 
when the web client polls various endpoints:

- Database access problems
- Federated PropertyProvider delays
- Serialization Time of JSON

If the response rate of the REST API is poor, this can affect the overall UX of 
the product and produce a situation where Ambari doesn't seem to be responding.

There should be an alert which provides queries into various parts of Ambari in 
order to determine if response times are acceptable. 

- This should be a {{SERVER}} side task
- If possible, the query should be made directly through the ResourceProvider 
framework to simulate a REST request. It should be made against the cluster 
endpoint since that's what is most likely polled.
- The alert should have configurable values for the threshold settings.


Diffs
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ambari-server/src/main/java/org/apache/ambari/server/actionmanager/ActionManager.java
 c12cf6f 
  
ambari-server/src/main/java/org/apache/ambari/server/alerts/AgentHeartbeatAlertRunnable.java
 0611e23 
  
ambari-server/src/main/java/org/apache/ambari/server/alerts/AlertRunnable.java 
PRE-CREATION 
  
ambari-server/src/main/java/org/apache/ambari/server/alerts/AmbariPerformanceRunnable.java
 PRE-CREATION 
  
ambari-server/src/main/java/org/apache/ambari/server/alerts/StaleAlertRunnable.java
 54abd62 
  
ambari-server/src/main/java/org/apache/ambari/server/state/alert/ParameterizedSource.java
 PRE-CREATION 
  
ambari-server/src/main/java/org/apache/ambari/server/state/alert/ScriptSource.java
 5871178 
  
ambari-server/src/main/java/org/apache/ambari/server/state/alert/ServerSource.java
 30e73bc 
  
ambari-server/src/main/java/org/apache/ambari/server/state/services/AmbariServerAlertService.java
 a13a8c7 
  ambari-server/src/main/resources/alerts.json e584b2c 
  
ambari-server/src/test/java/org/apache/ambari/server/alerts/AgentHeartbeatAlertRunnableTest.java
 673db7a 
  
ambari-server/src/test/java/org/apache/ambari/server/alerts/StaleAlertRunnableTest.java
 29b4ad5 

Diff: https://reviews.apache.org/r/45834/diff/


Testing
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PENDING...


Thanks,

Jonathan Hurley

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