7d685dfd6f
### What changes were proposed in this pull request?
This PR aims to skip rolling event log directories which has only `appstatus` file.
### Why are the changes needed?
Currently, Spark History server shows `IllegalArgumentException` warning, but the event log might arrive later. The situation also can happen when the job is killed before uploading its first log to the remote storages like S3.
```
21/07/30 07:38:26 WARN FsHistoryProvider:
Error while reading new log s3a://.../eventlog_v2_spark-95b5c736c8e44037afcf152534d08771
java.lang.IllegalArgumentException: requirement failed:
Log directory must contain at least one event log file!
...
at org.apache.spark.deploy.history.RollingEventLogFilesFileReader.files$lzycompute(EventLogFileReaders.scala:216)
```
### Does this PR introduce _any_ user-facing change?
Yes. Users will not see `IllegalArgumentException` warnings.
### How was this patch tested?
Pass the CIs with the newly added test case.
Closes #33586 from dongjoon-hyun/SPARK-36354.
Authored-by: Dongjoon Hyun <dhyun@apple.com>
Signed-off-by: Jungtaek Lim <kabhwan.opensource@gmail.com>
(cherry picked from commit
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