Github user squito commented on the pull request:
https://github.com/apache/spark/pull/6935#issuecomment-115742256
@steveloughran @XuTingjun sorry I finally took a closer look here. So I
tried running a manual test on this patch and
https://github.com/apache/spark/pull/6545, and it seems to me that *neither*
one solves the problem. (Or perhaps I am misunderstanding the issue.)
Here's the steps I took:
1) for this patch, modify the refresh time to 1 second just for testing
2) run the history server within an sbt session
```
build/sbt
project core
re-start
<choose option for HistoryServer>
```
3) In another window, fire up a spark-shell with event logging enabled, and
run a few jobs (and leave the shell open)
```
bin/spark-shell --conf "spark.eventLog.enabled=true"
val d = sc.parallelize(1 to 100)
d.count()
d.count()
```
4) View the app UI in the history server at localhost:18080, and also view
the apps own UI at localhost:4040
5) go back to the shell, run another `d.count()` job
6) take another look at the UI, both for the app itself (which updates) and
via the history server (which does not update, regardless of how long I wait.)
@XuTingjun it sounded like you had done some manual testing on
https://github.com/apache/spark/pull/6545 and believe that it should work. Is
there something wrong that I'm doing with my test?
Unless I'm testing the wrong thing, I think this demonstrates the need to
write a unit test which basically does the same thing, as its hard to verify
the complete correctness here. I'm writing that test case now.
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