**instructions only work for besu version 24.3.0 onwards (and the former **
UPDATE: Since 24.26.0-RC)**, this feature has been promoted to production ready and is enabled by default: `--bonsai-limit-trie-logs-enabled`
Step by Step Guide
IMPORTANT: we strongly recommend reading the rest of this documentation before running these commands because your node’s configuration may require changes to these commands…
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In reality, whilst the Merkle Patricia Trie is implicitly pruned, the BONSAI feature did introduce an extra data structure: the Trie Log (more detail about BONSAI and trie logs here: https://consensys.io/blog/bonsai-tries-guide)
The Trie Logs are retained in order to cope with chain reorgs. After each block is finalized, Trie Logs older than that are no longer required so it is safe to remove them from both the node's and the network's point of view.
How?
If you want to use this feature before it is enabled by default, simply add this option to your besu command: --Xbonsai-limit-trie-logs-enabled
When you restart besu it will begin pruning, block by block (and a cheeky bit during besu startup).
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https://github.com/hyperledger/besu/issues/5390
https://github.com/hyperledger/besu/pull/6026
https://github.com/hyperledger/besu/pull/6303