[jira] [Created] (FLINK-19876) Latency metrics can merge chain task latency metrics to reduce the number of latency metrics

[Shang Yuanchun (Jira)]

zlzhang0122 created FLINK-19876:
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             Summary: Latency metrics  can merge chain task latency metrics to reduce the number of latency metrics
                 Key: FLINK-19876
                 URL: https://issues.apache.org/jira/browse/FLINK-19876
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Metrics
            Reporter: zlzhang0122


In latency metrics report, each operator will report themselves latency metics, but actually the communication between chain operators which in one task is very fast and the latency can be ignored.So maybe we can merge the chain operator latency metrics into one to decrease the number of it.

For example, if source operator and downstream flat Map operator has been chained, now it will report the latency metrics separately, while we can merge it and make them report their latency metrics only once. 



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