In terms of implementation where does Storm stores the derived aggregation into? Does it use any embedded key value store etc?

mpandit — Tue, 21 Apr 2026 12:26:04 GMT

Re: In terms of implementation where does Storm stores the derived aggregation into? Does it use any embedded key value store etc?

mqureshi — Thu, 29 Dec 2016 09:30:20 GMT

Storm core has abstractions for bolts to save and retrieve the state of its operations. There is a default in-memory based state implementation and also a Redis backed implementation that provides state persistence.

Currently the only kind of State implementation that is supported is KeyValueState which provides key-value mapping.

Bolts that requires its state to be managed and persisted by the framework should implement the IStatefulBolt interface or extend the BaseStatefulBolt and implement void initState(T state) method.

Please see following link for details:

http://storm.apache.org/releases/2.0.0-SNAPSHOT/State-checkpointing.html

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In terms of implementation where does Storm stores the derived aggregation into? Does it use any embedded key value store etc?

Re: In terms of implementation where does Storm stores the derived aggregation into? Does it use any embedded key value store etc?