Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/2432#discussion_r18371309
--- Diff: core/src/main/scala/org/apache/spark/metrics/MetricsSystem.scala
---
@@ -98,10 +96,45 @@ private[spark] class MetricsSystem private (
sinks.foreach(_.report())
}
+ /**
+ * Build a unique name for each combination of application,
executor/driver and metric source.
+ * The name is built like <Application ID>.<Executor ID( or "driver" for
Driver)>.<Metric name>
--- End diff --
How about something like
```
Build a name that uniquely identifies each metric source.
The name is structured as follows: <app ID>.<executor ID (or
"driver")>.<source name>. If either ID is not available, this defaults to just
using <source name>.
```
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