[jira] [Created] (AMBARI-20392) Get aggregate metric records from HBase encounters performance issues

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

Chuan Jin created AMBARI-20392:
----------------------------------

             Summary: Get aggregate metric records from HBase encounters performance issues
                 Key: AMBARI-20392
                 URL: https://issues.apache.org/jira/browse/AMBARI-20392
             Project: Ambari
          Issue Type: Improvement
          Components: ambari-metrics
    Affects Versions: 2.4.2
            Reporter: Chuan Jin


I have a mini cluster ( ~6 nodes)  managed by Ambari, and use a distributed HBase (~3 nodes) to hold  metrics collected from these nodes.  After I deploy YARN serivce, then I notice that  some widgets (Cluster Memory,Cluster Disk,...)  cannot  display properly in the YARN service dashboard page.  And Ambari Server has continuous timeout exceptions, which complains that it doesn't get timeline metrics for connection refused.

The request timeout parameter is 5s, which means the query of getting metrics from HBase takes more time than that. Then I use Phoenix shell to login and perform the same query in the HBase , and it takes nearly 30s to finish.  But If I split the big query into small pieces , i mean, use less values in the "metric_name" field in the where ... in clause , then the result return in 1s after several small queries.  

The query performance in HBase is highly based on the design of rowkey and the proper usage for it.  In the method of getting aggregate metrics,  AMS collector query the METRIC_AGGREGATE  table in a way that may cause the co-processor to scan several regions across different RS. If we add more metrics in the service dashboard, this situation will be worse.



--
This message was sent by Atlassian JIRA
(v6.3.15#6346)