aokolnychyi opened a new pull request #569: Use broadcast variables in IcebergSource URL: https://github.com/apache/incubator-iceberg/pull/569 In some Spark jobs, we see a substantial scheduler delay, which happens in `TaskSetManager` when Spark serializes Iceberg `ReadTask`. The latter contains a reference to `FileIO` (which can contain a full Hadoop conf). The current idea is to broadcast `EncryptionManager` and `FileIO` in `IcebergSource`. Then `Reader` and `ReadTask` can store references to the broadcasted values and fetch actual ones in `createPartitionReader` while creating `TaskDataReader`. All broadcasted values are automatically registered for clean-up in `SparkContext$broadcast`. **Note!** Using this approach with Kryo requires providing a custom registrator to instruct Spark to apply Java serialization for `SerializableConfiguration`. We should extend #549 for this.
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