Actually transactional topologies are superseded by Trident, which is much easier to use: https://github.com/nathanmarz/storm/wiki/Trident-tutorial https://git

Actually transactional topologies are superseded by Trident, which is much easier to use: https://github.com/nathanmarz/storm/wiki/Trident-tutorial https://github.com/nathanmarz/storm/wiki/Trident-tutorial Here's an explanation on how Trident achieves fully fault-tolerant, idempotent semantics: https://github.com/nathanmarz/storm/wiki/Trident-state https://github.com/nathanmarz/storm/wiki/Trident-state