Ashish Misra created HBASE-18982:
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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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