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I'm syncing my node with geth and I used the light mode.

>start geth --syncmode "light"

Then a parameter type="bloombits" appeared. What is bloombits?

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At its simplest, from doc.go:

// Package bloombits implements bloom filtering on batches of data.
package bloombits

Of interest: How does Ethereum make use of bloom filters? (In short, to allow efficient searching over event logs.)

One step further back: Bloom Filter (Wikipedia)

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  • Great I get it, so it's only used when light mode? That would be logic since it needs less memory? Commented Dec 18, 2017 at 20:05
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    It's not just specific to light mode, no :-) Commented Dec 20, 2017 at 20:05

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