I'm trying to understand the concept of 'consecutive non-overlapping ranges of keys' in distributed key distribution. Can you explain how this concept is applied in the context of distributing keys by hash to each executor?
JJ
Asked on May 16, 2022
In distributed key distribution, 'consecutive non-overlapping ranges of keys' refer to the allocation of a continuous range of keys to a specific executor without any overlap with keys assigned to other executors.
This concept is applied when distributing data by group key for operations like HashAgg.
For example, if there are aggregation functions like max(x) or min(x), one HashAgg actor may acquire a 'consecutive' range of all values of that column for a given group key.
This ensures that each executor handles a specific range of keys without duplication or overlap, facilitating efficient data processing and aggregation.