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From "Ashish Misra (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-18982) Metrics are lost when Metrics-Region-Source object is de-registered from Metrics-Aggregate-Region-Source object.
Date Tue, 10 Oct 2017 18:34:00 GMT
Ashish Misra created HBASE-18982:
------------------------------------

             Summary: Metrics are lost when Metrics-Region-Source object is de-registered
from Metrics-Aggregate-Region-Source object.
                 Key: HBASE-18982
                 URL: https://issues.apache.org/jira/browse/HBASE-18982
             Project: HBase
          Issue Type: Bug
          Components: Coprocessors, metrics
            Reporter: Ashish Misra


The Metrics-Region-Source class maintains metrics for a given region. 

The Metrics-Region-Aggregate-Source class allows register/deregister of objects of type Metric-Region-Source.
The get-Metrics method on Metrics-Region-Source-Aggregate class, gets metrics from all the
Metrics-Region-Source objects registered with it.

The Metrics-Region-Source object is deregistered when the region is closed.

When a Metrics-Region-Source object is deregistered, its directly removed from the set maintained
by Metrics-Region-Aggregate-Source object. In such a case, the final metrics of Metrics-Region-Source
object are lost. These metrics must be logged one last time before the Metrics-Region-Source
object is removed. 



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