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From "L. C. Hsieh (Jira)" <>
Subject [jira] [Commented] (SPARK-34198) Add RocksDB StateStore as external module
Date Sun, 14 Feb 2021 18:51:00 GMT


L. C. Hsieh commented on SPARK-34198:

Thanks [~rxin]. Is the implementation used in Databricks a completely different one than other
two implementations? Or it is also based on any one of the two?

> Add RocksDB StateStore as external module
> -----------------------------------------
>                 Key: SPARK-34198
>                 URL:
>             Project: Spark
>          Issue Type: New Feature
>          Components: Structured Streaming
>    Affects Versions: 3.2.0
>            Reporter: L. C. Hsieh
>            Assignee: L. C. Hsieh
>            Priority: Major
> Currently Spark SS only has one built-in StateStore implementation HDFSBackedStateStore.
Actually it uses in-memory map to store state rows. As there are more and more streaming applications,
some of them requires to use large state in stateful operations such as streaming aggregation
and join.
> Several other major streaming frameworks already use RocksDB for state management. So
it is proven to be good choice for large state usage. But Spark SS still lacks of a built-in
state store for the requirement.
> We would like to explore the possibility to add RocksDB-based StateStore into Spark SS.
For the concern about adding RocksDB as a direct dependency, our plan is to add this StateStore
as an external module first.

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