Howard Yoo updated HADOOP-15230:
    Release Note: Corrected problems with GraphiteSink not having proper format 
in point tags. Format v1.1 suggests point tags should be delimited with ';' 
rather than '.' and also appear at the end of the metric name, not in the 
middle. Also removed risk of point tag value having empty space (will be 
replaced by '_').
          Status: Patch Available  (was: Open)

> org.apache.hadoop.metrics2.GraphiteSink is not implemented correctly
> --------------------------------------------------------------------
>                 Key: HADOOP-15230
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15230
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: metrics
>            Reporter: Howard Yoo
>            Priority: Major
>              Labels: GraphiteSink,, metrics
>         Attachments: HADOOP-15230.001.patch
> org.apache.hadoop.metrics2.GraphiteSink's implementation has certain problems 
> that would make it to generate metrics incorrectly.
> The problem lies with line 77 ~ 84 of the GraphiteSink java:
> {code:java}
> for (MetricsTag tag : record.tags()) {
> if (tag.value() != null) {
> metricsPathPrefix.append(".");
> metricsPathPrefix.append(tag.name());
> metricsPathPrefix.append("=");
> metricsPathPrefix.append(tag.value());
> }
> }
> {code}
> It produces point tags having name=value pair in the metrics. However, notice 
> how the tags are added with '.' as its delimiters. Rather than using the '.' 
> character, it should follow the following convention mentioned in the latest 
> graphite doc of using ';' character.
> [http://graphite.readthedocs.io/en/latest/tags.html]
> Also, the value is not properly being escaped, meaning that if the value has 
> a '.' character in it, it will easily confuse Graphite to accept it as a 
> delimiter, rather than the value. A really good prime example is when the 
> value is a hostname or ip address,
> {code:java}
> metrics.example.Hostname=this.is.a.hostname.and.this.is.Metrics 10.0{code}
> In this example, the since the value of the hostname contains '.', it is 
> extremely hard for the receiving end to determine which part is hostname and 
> which part is the rest of the metrics name. A good strategy is to convert any 
> '.' character in the value to be converted to other characters, such as '_'.
> However, the best way would be to follow the latest metrics convention of 
> using ';'
> {code:java}
> metrics.example.and.this.is.Metrics;Hostname=this.is.a.hostname 10.0{code}

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