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Bootstrap falls back to getting highest full snapshot (#21124)

This commit is contained in:
Brooks Prumo 2021-11-03 19:23:30 -05:00 committed by GitHub
parent b4ff488a0d
commit 7508c36209
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1 changed files with 159 additions and 94 deletions
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205
validator/src/bootstrap.rs
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@ -811,7 +811,7 @@ mod with_incremental_snapshots {
/// A snapshot hash. In this context (bootstrap *with* incremental snapshots), a snapshot hash
/// is _both_ a full snapshot hash and an (optional) incremental snapshot hash.
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone, Copy)]
struct SnapshotHash {
full: (Slot, Hash),
incr: Option<(Slot, Hash)>,
@ -1111,7 +1111,21 @@ mod with_incremental_snapshots {
bootstrap_config: &RpcBootstrapConfig,
rpc_peers: &[ContactInfo],
) -> Vec<PeerSnapshotHash> {
let trusted_snapshot_hashes = get_trusted_snapshot_hashes(cluster_info, validator_config);
// Which strategy to use for getting the peer snapshot hashes? The standard way is what's
// described in the function's documentation. However, if there are no trusted peers that
// have enabled incremental snapshots, it may be possible that there are no snapshot hashes
// with a slot that is a multiple of our full snapshot archive interval. If that happens,
// we retry with the "fallback" strategy that *does not* filter based on full snapshot
// archive interval.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
enum Strategy {
Standard,
Fallback,
}
for strategy in [Strategy::Standard, Strategy::Fallback] {
let trusted_snapshot_hashes =
get_trusted_snapshot_hashes(cluster_info, validator_config);
let mut peer_snapshot_hashes = get_trusted_peer_snapshot_hashes(
cluster_info,
@ -1119,7 +1133,14 @@ mod with_incremental_snapshots {
bootstrap_config,
rpc_peers,
);
retain_trusted_peer_snapshot_hashes(&trusted_snapshot_hashes, &mut peer_snapshot_hashes);
retain_trusted_peer_snapshot_hashes(
&trusted_snapshot_hashes,
&mut peer_snapshot_hashes,
);
if strategy == Strategy::Standard {
// The standard strategy is to retain only the peer snapshot hashes with a multiple
// of our full snapshot archive interval
retain_peer_snapshot_hashes_with_a_multiple_of_full_snapshot_archive_interval(
validator_config
.snapshot_config
@ -1128,12 +1149,29 @@ mod with_incremental_snapshots {
.full_snapshot_archive_interval_slots,
&mut peer_snapshot_hashes,
);
// However, if at this point peer_snasphot_hashes is empty, then retry from the
// beginning with the "fallback" strategy and *do not* filter based on full
// snapshot archive interval.
if peer_snapshot_hashes.is_empty() {
info!(
"No peer snapshot hashes found with a slot that is a multiple of our \
full snapshot archive interval. Retrying, but without filtering based \
on full snapshot archive interval."
);
continue;
}
}
retain_peer_snapshot_hashes_with_highest_full_snapshot_slot(&mut peer_snapshot_hashes);
retain_peer_snapshot_hashes_with_highest_incremental_snapshot_slot(
&mut peer_snapshot_hashes,
);
peer_snapshot_hashes
return peer_snapshot_hashes;
}
unreachable!("for-loop above is guaranteed to return");
}
/// Get the snapshot hashes from trusted peers.
@ -1143,9 +1181,9 @@ mod with_incremental_snapshots {
/// individual snapshot hashes, their results will be checked against this map to verify
/// correctness.
///
/// NOTE: Only a single full snashot hash is allowed per slot. If somehow two trusted peers
/// have a full snapshot hash with the same slot and _different_ hashes, the second will be
/// skipped, and its incremental snapshot hashes will not be added to the map.
/// NOTE: Only a single snashot hash is allowed per slot. If somehow two trusted peers have a
/// snapshot hash with the same slot and _different_ hashes, the second will be skipped. This
/// applies to both full and incremental snapshot hashes.
fn get_trusted_snapshot_hashes(
cluster_info: &ClusterInfo,
validator_config: &ValidatorConfig,
@ -1161,14 +1199,34 @@ mod with_incremental_snapshots {
trusted_validators
.iter()
.for_each(|trusted_validator| {
// First get the Crds::SnapshotHashes for each trusted validator and add them as
// the keys in the trusted snapshot hashes HashMap.
let mut full_snapshot_hashes = Vec::new();
cluster_info.get_snapshot_hash_for_node(trusted_validator, |snapshot_hashes| {
full_snapshot_hashes = snapshot_hashes.clone();
});
full_snapshot_hashes.into_iter().for_each(|full_snapshot_hash| {
// Do not add this hash if there's already a full snapshot hash with the same
// slot but with a _different_ hash.
// NOTE: There's no good reason for trusted validators to produce snapshots at
// the same slot with different hashes, so this should not happen.
if !trusted_snapshot_hashes.keys().any(|trusted_snapshot_hash| {
trusted_snapshot_hash.0 == full_snapshot_hash.0 && trusted_snapshot_hash.1 != full_snapshot_hash.1
}) {
trusted_snapshot_hashes.insert(full_snapshot_hash, HashSet::new());
} else {
info!("Ignoring full snapshot hash from trusted validator {} with a slot we've already seen (slot: {}), but a different hash.", trusted_validator, full_snapshot_hash.0);
}
});
// Then get the Crds::IncrementalSnapshotHashes for each trusted validator and add
// them as the values in the trusted snapshot hashes HashMap.
if let Some(crds_value::IncrementalSnapshotHashes {base: full_snapshot_hash, hashes: incremental_snapshot_hashes, ..}) = cluster_info.get_incremental_snapshot_hashes_for_node(trusted_validator) {
match trusted_snapshot_hashes.get_mut(&full_snapshot_hash) {
Some(hashes) => {
// Do not add these hashes if there's already an incremental
// snapshot hash with this same slot, but with a _different_ hash.
// NOTE: There's no good reason for trusted validators to
// produce incremental snapshots at the same slot with
// different hashes, so this should not happen.
if let Some(hashes) = trusted_snapshot_hashes.get_mut(&full_snapshot_hash) {
// Do not add this hash if there's already an incremental snapshot hash
// with the same slot, but with a _different_ hash.
// NOTE: There's no good reason for trusted validators to produce snapshots
// at the same slot with different hashes, so this should not happen.
for incremental_snapshot_hash in incremental_snapshot_hashes {
if !hashes.iter().any(|(slot, hash)| slot == &incremental_snapshot_hash.0 && hash != &incremental_snapshot_hash.1) {
hashes.insert(incremental_snapshot_hash);
@ -1176,27 +1234,15 @@ mod with_incremental_snapshots {
info!("Ignoring incremental snapshot hash from trusted validator {} with a slot we've already seen (slot: {}), but a different hash.", trusted_validator, incremental_snapshot_hash.0);
}
}
}
None => {
// Do not add these hashes if there's already a full snapshot hash
// with the same slot but with a _different_ hash.
// NOTE: There's no good reason for trusted validators to
// produce full snapshots at the same slot with different
// hashes, so this should not happen.
if !trusted_snapshot_hashes.keys().any(
|(slot, hash)| {
slot == &full_snapshot_hash.0
&& hash != &full_snapshot_hash.1
},
) {
let mut hashes = HashSet::new();
hashes.extend(incremental_snapshot_hashes);
trusted_snapshot_hashes
.insert(full_snapshot_hash, hashes);
} else {
info!("Ignoring full snapshot hashes from trusted validator {} with a slot we've already seen (slot: {}), but a different hash.", trusted_validator, full_snapshot_hash.0);
}
}
// Since incremental snapshots *must* have a valid base (i.e. full)
// snapshot, if .get() returned None, then that can only happen if there
// already is a full snapshot hash in the trusted snapshot hashes with the
// same slot but _different_ a hash. Assert that below. If the assert
// ever fails, there is a programmer bug.
assert!(trusted_snapshot_hashes.keys().any(|(slot, hash)| slot == &full_snapshot_hash.0 && hash != &full_snapshot_hash.1),
"There must exist a full snapshot hash already in trusted snapshot hashes with the same slot but a different hash");
info!("Ignoring incremental snapshot hashes from trusted validator {} with a base slot we've already seen (base slot: {}), but a different base hash.", trusted_validator, full_snapshot_hash.0);
}
}
});
@ -1219,47 +1265,30 @@ mod with_incremental_snapshots {
if bootstrap_config.no_untrusted_rpc
&& !is_trusted_validator(&rpc_peer.id, &validator_config.trusted_validators)
{
// Ignore all untrusted peers
// We were told to ignore untrusted peers
continue;
}
cluster_info
.get_incremental_snapshot_hashes_for_node(&rpc_peer.id)
.and_then(
|crds_value::IncrementalSnapshotHashes { base, hashes, .. }| {
// Newer hashes are pushed to the end of `hashes`, so the last element should
// be the newest (i.e. have the highest slot).
//
// NOTE: It is important that the result of `last().map()` is the return value
// from `and_then()`, so that the `or_else()` can run in _both_ scenarios where
// either (1) the peer does not have incremental snapshots enabled, or (2) the
// peer has not generated any incremental snapshots yet.
hashes.last().map(|incremental_snapshot_hash| {
peer_snapshot_hashes.push(PeerSnapshotHash {
rpc_contact_info: rpc_peer.clone(),
snapshot_hash: SnapshotHash {
full: base,
incr: Some(*incremental_snapshot_hash),
},
})
})
},
)
// If the peer does not have any incremental snapshot hashes, then get its highest full
// snapshot hash instead.
.or_else(|| {
cluster_info.get_snapshot_hash_for_node(&rpc_peer.id, |hashes| {
if let Some(full_snapshot_hash) = hashes.last() {
peer_snapshot_hashes.push(PeerSnapshotHash {
rpc_contact_info: rpc_peer.clone(),
snapshot_hash: SnapshotHash {
full: *full_snapshot_hash,
incr: None,
},
})
// Get the highest incremental snapshot hash for this peer.
let mut highest_snapshot_hash =
get_highest_incremental_snapshot_hash_for_peer(cluster_info, &rpc_peer.id);
// Get this peer's highest (full) snapshot hash. We need to get these snapshot hashes
// (instead of just the IncrementalSnapshotHashes) in case the peer is either (1) not
// taking incremental snapshots, or (2) if the last snapshot taken was a full snapshot,
// which would get pushed to CRDS here (i.e. `crds_value::SnapshotHashes`) first.
let snapshot_hash = get_highest_full_snapshot_hash_for_peer(cluster_info, &rpc_peer.id);
if snapshot_hash > highest_snapshot_hash {
highest_snapshot_hash = snapshot_hash;
}
})
// ...and add the highest snapshot hash to our return vector!
if let Some(snapshot_hash) = highest_snapshot_hash {
peer_snapshot_hashes.push(PeerSnapshotHash {
rpc_contact_info: rpc_peer.clone(),
snapshot_hash,
});
};
}
trace!("peer snapshot hashes: {:?}", &peer_snapshot_hashes);
@ -1596,6 +1625,42 @@ mod with_incremental_snapshots {
}
}
/// Get the highest full snapshot hash for a peer from CRDS
fn get_highest_full_snapshot_hash_for_peer(
cluster_info: &ClusterInfo,
peer: &Pubkey,
) -> Option<SnapshotHash> {
let mut full_snapshot_hashes = Vec::new();
cluster_info.get_snapshot_hash_for_node(peer, |snapshot_hashes| {
full_snapshot_hashes = snapshot_hashes.clone()
});
full_snapshot_hashes
.into_iter()
.max()
.map(|full_snapshot_hash| SnapshotHash {
full: full_snapshot_hash,
incr: None,
})
}
/// Get the highest incremental snapshot hash for a peer from CRDS
fn get_highest_incremental_snapshot_hash_for_peer(
cluster_info: &ClusterInfo,
peer: &Pubkey,
) -> Option<SnapshotHash> {
cluster_info
.get_incremental_snapshot_hashes_for_node(peer)
.map(
|crds_value::IncrementalSnapshotHashes { base, hashes, .. }| {
let highest_incremental_snapshot_hash = hashes.into_iter().max();
SnapshotHash {
full: base,
incr: highest_incremental_snapshot_hash,
}
},
)
}
#[cfg(test)]
mod tests {
use super::*;