ForVic opened a new pull request, #51882:
URL: https://github.com/apache/spark/pull/51882
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### What changes were proposed in this pull request?
Report a heartbeat on the driver when the application stops.
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### Why are the changes needed?
Some spark applications do not launch any jobs or stages, and are used as
'driver-only' jobs. Spark tracks memory metrics at a per-stage level, including
for the driver. This isn't a strict requirement for the driver, and is done as
a way to simplify the internal state of metric collection, so a driver
container can be treated the same as an executor one. However, this results in
some applications not having driver memory metrics at all, e.g. in SHS as
writing memory metrics to the event log is only done on stage completion.
Although driver memory was being used and tracked, it is never logged.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Tested with a custom job that was driver-only, previously this would have no
metrics in SHS, now we see:
### Was this patch authored or co-authored using generative AI tooling?
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