Github user viirya commented on the issue:
https://github.com/apache/spark/pull/18343
@wangyum Are you using kyro serializer? I think it is why you hit this
issue.
Once you use kyro, I think the `readExternal` in
`HighlyCompressedMapStatus` won't be used to deserialize the object in driver
side. As `hugeBlockSizes` is a `transient` variable, it is null now. So when we
try to serialize it again, as `MapOutputTracker.serializeMapStatuses` directly
call `ObjectOutputStream.writeObject` to serialize it, it calls
`HighlyCompressedMapStatus.writeExternal` and cause NPE.
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