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DEFAULT_BACKFILL_RUN_THRESHOLD

reth::builder::config

Constant DEFAULT_BACKFILL_RUN_THRESHOLD 

Source 
pub const DEFAULT_BACKFILL_RUN_THRESHOLD: u64 = EPOCH_SLOTS; // 32u64
Expand description

The largest gap for which the tree will be used to sync individual blocks by downloading them.

This is the default threshold, and represents the distance (gap) from the local head to a new (canonical) block, e.g. the forkchoice head block. If the block distance from the local head exceeds this threshold, the pipeline will be used to backfill the gap more efficiently.

E.g.: Local head block.number is 100 and the forkchoice head block.number is 133 (more than an epoch has slots), then this exceeds the threshold at which the pipeline should be used to backfill this gap.