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Exponential backoff follow up (#1349)

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* document new functionality [ci skip]

Refs #1304

* add fixme [ci skip]

Refs #1304

* ensure that we dial peer after backoff duration

Refs #1304
This commit is contained in:
Anton Kaliaev
2018-03-23 09:48:27 +01:00
committed by GitHub
parent 6545a21369
commit a7250af303
3 changed files with 23 additions and 3 deletions
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docs/specification/new-spec/reactors/pex/pex.md
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@@ -57,10 +57,17 @@ a trust metric (see below), but it's best to start with something simple.
## Select Peers to Dial
When we need more peers, we pick them randomly from the addrbook with some
configurable bias for unvetted peers. The bias should be lower when we have fewer peers,
configurable bias for unvetted peers. The bias should be lower when we have fewer peers
and can increase as we obtain more, ensuring that our first peers are more trustworthy,
but always giving us the chance to discover new good peers.
We track the last time we dialed a peer and the number of unsuccessful attempts
we've made. If too many attempts are made, we mark the peer as bad.
Connection attempts are made with exponential backoff (plus jitter). Because
the selection process happens every `ensurePeersPeriod`, we might not end up
dialing a peer for much longer than the backoff duration.
## Select Peers to Exchange
When we’re asked for peers, we select them as follows: