This ticket would enable users to configure the timing of slow-start with `tez.shuffle-vertex-manager.min-src-fraction` and `tez.shuffle-vertex-manager.max-src-fraction`.
Hive on Tez currently doesn't honor these parameters and ShuffleVertexManager always uses the default value.
We can control the timing to start vertexes the accuracy of estimated input size if we can tweak these ones. This is useful when a vertex has tasks that process a different amount of data.
We can reproduce the issue with this query.
The fractions are ignored.