Github user sarutak commented on the pull request:
https://github.com/apache/spark/pull/3812#issuecomment-71810090
Sorry I didn't notice this change affects for specific metrics sinks.
I still think this change is needed. The identifier is used for metrics
name so without this change, the metrics name for the driver is different
between local mode and any other mode. It confuses monitoring.
Also, regardless of this change, the parse issue could occur because the
identifier `<driver>` has been used for `spark.executor.id` in local mode even
before this change.
I'll fix this issue by renaming the identifier from `<driver>` to `driver`.
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