Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22353
Although event log is in JSON format, it's mostly for internal usage, to be
load by history server and used to build the Spark UI. For compatibility, we
only focus on making history to be able to load event logs from different spark
versions, not the event log itself. At the end it's still a log.
Metadata is a hack which I really hate to add back. Can you describe more
details about your use case? Let's see if we can solve it with the Spark driver
log.
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