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[doc] Clarify semantic of peer's m_protect w.r.t to outbound eviction logics

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The field m_protect is used to protect from eviction both by bad/lagging
chain and extra outbound peers logics. Outbound block-relay peers are
always excluded from this protection.
This commit is contained in:
Antoine Riard 2020-09-04 14:33:00 -04:00
parent ac71fe936d
commit d76925478e
1 changed files with 14 additions and 4 deletions
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18
src/net_processing.cpp
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@ -321,10 +321,17 @@ struct CNodeState {
*/
bool fSupportsDesiredCmpctVersion;
/** State used to enforce CHAIN_SYNC_TIMEOUT
* Only in effect for outbound, non-manual, full-relay connections, with
* m_protect == false
* Algorithm: if a peer's best known block has less work than our tip,
/** State used to enforce CHAIN_SYNC_TIMEOUT and EXTRA_PEER_CHECK_INTERVAL logic.
*
* Both are only in effect for outbound, non-manual, non-protected connections.
* Any peer protected (m_protect = true) is not chosen for eviction. A peer is
* marked as protected if all of these are true:
* - its connection type is IsBlockOnlyConn() == false
* - it gave us a valid connecting header
* - we haven't reached MAX_OUTBOUND_PEERS_TO_PROTECT_FROM_DISCONNECT yet
* - it has a better chain than we have
*
* CHAIN_SYNC_TIMEOUT: if a peer's best known block has less work than our tip,
* set a timeout CHAIN_SYNC_TIMEOUT seconds in the future:
* - If at timeout their best known block now has more work than our tip
* when the timeout was set, then either reset the timeout or clear it
@ -334,6 +341,9 @@ struct CNodeState {
* and set a shorter timeout, HEADERS_RESPONSE_TIME seconds in future.
* If their best known block is still behind when that new timeout is
* reached, disconnect.
*
* EXTRA_PEER_CHECK_INTERVAL: after each interval, if we have too many outbound peers,
* drop the outbound one that least recently announced us a new block.
*/
struct ChainSyncTimeoutState {
//! A timeout used for checking whether our peer has sufficiently synced