warrenzhu25 opened a new pull request #28941:
URL: https://github.com/apache/spark/pull/28941
### What changes were proposed in this pull request?
Fix bug of exception when parse event log of fetch failed task end reason
without `Map Index`
### Why are the changes needed?
When Spark history server read event log produced by older version of spark
2.4 (which don't have `Map Index` field), parsing of TaskEndReason will fail.
This will cause TaskEnd event being ignored.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
JsonProtocolSuite.test("FetchFailed Map Index backwards compatibility")
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