[jira] [Created] (FLINK-16397) [metric] flink metric graphite will format double metrics to "%2.2f"

["BlaBlabla (Jira)" <ji...@apache.org>]

BlaBlabla created FLINK-16397:
---------------------------------

             Summary: [metric] flink metric graphite will format double metrics to "%2.2f"
                 Key: FLINK-16397
                 URL: https://issues.apache.org/jira/browse/FLINK-16397
             Project: Flink
          Issue Type: Bug
          Components: Runtime / Metrics
            Reporter: BlaBlabla


I'm using flink GraphiteReporter to monitor metrics. But I found that the GraphiteReporter will convert double / float type metrics to the format : "%2.2f", only keep two fractions. like CPU_LOAD metric was converted to a wired value, like  0.00, 0.01 .

 it is bad :(

For more detail, see the double format function in dropwizard metrics project::

[https://github.com/dropwizard/metrics/blob/4.1-development/metrics-graphite/src/main/java/com/codahale/metrics/graphite/GraphiteReporter.java#L401]
{code:java}
    protected String format(double v) {
        // the Carbon plaintext format is pretty underspecified, but it seems like it just wants
        // US-formatted digits
        return String.format(Locale.US, "%2.2f", v);
{code}



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