Constant relay_substrate_client::ANCIENT_BLOCK_THRESHOLD
source · pub const ANCIENT_BLOCK_THRESHOLD: u32 = 128;Expand description
The difference between best block number and number of its ancestor, that is enough for us to consider that ancestor an “ancient” block with dropped state.
The relay does not assume that it is connected to the archive node, so it always tries to use the best available chain state. But sometimes it still may use state of some old block. If the state of that block is already dropped, relay will see errors when e.g. it tries to prove something.
By default Substrate-based nodes are storing state for last 256 blocks. We’ll use half of this value.