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https://issues.apache.org/jira/browse/FLINK-4564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15523155#comment-15523155
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ASF GitHub Bot commented on FLINK-4564:
---------------------------------------

Github user zentol commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2517#discussion_r80477622
  
    --- Diff: 
flink-runtime/src/test/java/org/apache/flink/runtime/metrics/MetricRegistryTest.java
 ---
    @@ -280,4 +282,65 @@ public void testConfigurableDelimiter() {
     
                registry.shutdown();
        }
    +
    +   @Test
    +   public void testConfigurableDelimiterForReporters() {
    +           Configuration config = new Configuration();
    +           config.setString(ConfigConstants.METRICS_REPORTERS_LIST, 
"test1,test2,test3");
    +           config.setString(ConfigConstants.METRICS_REPORTER_PREFIX + 
"test1." + ConfigConstants.METRICS_REPORTER_SCOPE_DELIMITER, "_");
    +           config.setString(ConfigConstants.METRICS_REPORTER_PREFIX + 
"test1." + ConfigConstants.METRICS_REPORTER_CLASS_SUFFIX, 
TestReporter.class.getName());
    +           config.setString(ConfigConstants.METRICS_REPORTER_PREFIX + 
"test2." + ConfigConstants.METRICS_REPORTER_SCOPE_DELIMITER, "-");
    +           config.setString(ConfigConstants.METRICS_REPORTER_PREFIX + 
"test2." + ConfigConstants.METRICS_REPORTER_CLASS_SUFFIX, 
TestReporter.class.getName());
    +           config.setString(ConfigConstants.METRICS_REPORTER_PREFIX + 
"test3." + ConfigConstants.METRICS_REPORTER_SCOPE_DELIMITER, "AA");
    +           config.setString(ConfigConstants.METRICS_REPORTER_PREFIX + 
"test3." + ConfigConstants.METRICS_REPORTER_CLASS_SUFFIX, 
TestReporter.class.getName());
    +
    +           MetricRegistry registry = new MetricRegistry(config);
    +
    +           assertEquals('.', registry.getDelimiter());
    --- End diff --
    
    introducing a static final char field for the global delimiter would 
improve readability.


> [metrics] Delimiter should be configured per reporter
> -----------------------------------------------------
>
>                 Key: FLINK-4564
>                 URL: https://issues.apache.org/jira/browse/FLINK-4564
>             Project: Flink
>          Issue Type: Bug
>          Components: Metrics
>    Affects Versions: 1.1.0
>            Reporter: Chesnay Schepler
>            Assignee: Anton Mushin
>
> Currently, the delimiter used or the scope string is based on a configuration 
> setting shared by all reporters. However, different reporters may have 
> different requirements in regards to the delimiter, as such we should allow 
> reporters to use a different delimiter.
> We can keep the current setting as a global setting that is used if no 
> specific setting was set.



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