[jira] [Created] (FLINK-7689) Instrument the Flink JDBC connector

[Shang Yuanchun (Jira)]

Martin Eden created FLINK-7689:
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             Summary: Instrument the Flink JDBC connector
                 Key: FLINK-7689
                 URL: https://issues.apache.org/jira/browse/FLINK-7689
             Project: Flink
          Issue Type: Improvement
          Components: Streaming Connectors
    Affects Versions: 1.4.0
            Reporter: Martin Eden
            Priority: Minor
             Fix For: 1.4.0


As confirmed by the Flink community in the following mailing list [message|http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/metrics-for-Flink-sinks-td15200.html]  using off the shelf Flink sinks like the JDBC sink, Redis sink or Cassandra sink etc does not expose any sink specific metrics.

The purpose of this ticket is to add some relevant metrics to the JDBCSinkFunction and JDBCOutputFormat:
- Meters for when a flush is made or snapshot state is called.
- Histograms for the jdbc batch count and batch execution latency.

These would allow deeper understanding of the runtime behaviour of performance critical jobs writing to external databases using this generic interface.




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