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https://issues.apache.org/jira/browse/HADOOP-15230?focusedWorklogId=549341&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-549341
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ASF GitHub Bot logged work on HADOOP-15230:
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Author: ASF GitHub Bot
Created on: 07/Feb/21 22:26
Start Date: 07/Feb/21 22:26
Worklog Time Spent: 10m
Work Description: howardyoo closed pull request #340:
URL: https://github.com/apache/hadoop/pull/340
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Issue Time Tracking
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Worklog Id: (was: 549341)
Time Spent: 20m (was: 10m)
> 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
> Assignee: Howard Yoo
> Priority: Major
> Labels: GraphiteSink,, metrics, pull-request-available
> Attachments: HADOOP-15230.007.patch
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> 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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