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Implement negative UNL functionality:

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This change can help improve the liveness of the network during periods of network
instability, by allowing the network to track which validators are presently not online
and to disregard them for the purposes of quorum calculations.
This commit is contained in:
Peng Wang
2020-03-01 21:03:19 -05:00
committed by manojsdoshi
parent 51bd4626b1
commit 706ca874b0
41 changed files with 4344 additions and 73 deletions
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180
src/test/app/ValidatorList_test.cpp
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@@ -1267,6 +1267,185 @@ private:
}
}
void
testNegativeUNL()
{
testcase("NegativeUNL");
jtx::Env env(*this);
PublicKey emptyLocalKey;
ManifestCache manifests;
auto createValidatorList =
[&](std::uint32_t vlSize,
boost::optional<std::size_t> minimumQuorum = {})
-> std::shared_ptr<ValidatorList> {
auto trustedKeys = std::make_shared<ValidatorList>(
manifests,
manifests,
env.timeKeeper(),
env.app().config().legacy("database_path"),
env.journal,
minimumQuorum);
std::vector<std::string> cfgPublishers;
std::vector<std::string> cfgKeys;
hash_set<NodeID> activeValidators;
cfgKeys.reserve(vlSize);
while (cfgKeys.size() < cfgKeys.capacity())
{
auto const valKey = randomNode();
cfgKeys.push_back(toBase58(TokenType::NodePublic, valKey));
activeValidators.emplace(calcNodeID(valKey));
}
if (trustedKeys->load(emptyLocalKey, cfgKeys, cfgPublishers))
{
trustedKeys->updateTrusted(activeValidators);
if (trustedKeys->quorum() == std::ceil(cfgKeys.size() * 0.8f))
return trustedKeys;
}
return nullptr;
};
/*
* Test NegativeUNL
* == Combinations ==
* -- UNL size: 34, 35, 57
* -- nUNL size: 0%, 20%, 30%, 50%
*
* == with UNL size 60
* -- set == get,
* -- check quorum, with nUNL size: 0, 12, 30, 18
* -- nUNL overlap: |nUNL - UNL| = 5, with nUNL size: 18
* -- with command line minimumQuorum = 50%,
* seen_reliable affected by nUNL
*/
{
hash_set<NodeID> activeValidators;
//== Combinations ==
std::array<std::uint32_t, 4> unlSizes = {34, 35, 39, 60};
std::array<std::uint32_t, 4> nUnlPercent = {0, 20, 30, 50};
for (auto us : unlSizes)
{
for (auto np : nUnlPercent)
{
auto validators = createValidatorList(us);
BEAST_EXPECT(validators);
if (validators)
{
std::uint32_t nUnlSize = us * np / 100;
auto unl = validators->getTrustedMasterKeys();
hash_set<PublicKey> nUnl;
auto it = unl.begin();
for (std::uint32_t i = 0; i < nUnlSize; ++i)
{
nUnl.insert(*it);
++it;
}
validators->setNegativeUnl(nUnl);
validators->updateTrusted(activeValidators);
BEAST_EXPECT(
validators->quorum() ==
static_cast<std::size_t>(std::ceil(
std::max((us - nUnlSize) * 0.8f, us * 0.6f))));
}
}
}
}
{
//== with UNL size 60
auto validators = createValidatorList(60);
BEAST_EXPECT(validators);
if (validators)
{
hash_set<NodeID> activeValidators;
auto unl = validators->getTrustedMasterKeys();
BEAST_EXPECT(unl.size() == 60);
{
//-- set == get,
//-- check quorum, with nUNL size: 0, 30, 18, 12
auto nUnlChange = [&](std::uint32_t nUnlSize,
std::uint32_t quorum) -> bool {
hash_set<PublicKey> nUnl;
auto it = unl.begin();
for (std::uint32_t i = 0; i < nUnlSize; ++i)
{
nUnl.insert(*it);
++it;
}
validators->setNegativeUnl(nUnl);
auto nUnl_temp = validators->getNegativeUnl();
if (nUnl_temp.size() == nUnl.size())
{
for (auto& n : nUnl_temp)
{
if (nUnl.find(n) == nUnl.end())
return false;
}
validators->updateTrusted(activeValidators);
return validators->quorum() == quorum;
}
return false;
};
BEAST_EXPECT(nUnlChange(0, 48));
BEAST_EXPECT(nUnlChange(30, 36));
BEAST_EXPECT(nUnlChange(18, 36));
BEAST_EXPECT(nUnlChange(12, 39));
}
{
// nUNL overlap: |nUNL - UNL| = 5, with nUNL size: 18
auto nUnl = validators->getNegativeUnl();
BEAST_EXPECT(nUnl.size() == 12);
std::size_t ss = 33;
std::vector<uint8_t> data(ss, 0);
data[0] = 0xED;
for (int i = 0; i < 6; ++i)
{
Slice s(data.data(), ss);
data[1]++;
nUnl.emplace(s);
}
validators->setNegativeUnl(nUnl);
validators->updateTrusted(activeValidators);
BEAST_EXPECT(validators->quorum() == 39);
}
}
}
{
//== with UNL size 60
//-- with command line minimumQuorum = 50%,
// seen_reliable affected by nUNL
auto validators = createValidatorList(60, 30);
BEAST_EXPECT(validators);
if (validators)
{
hash_set<NodeID> activeValidators;
hash_set<PublicKey> unl = validators->getTrustedMasterKeys();
auto it = unl.begin();
for (std::uint32_t i = 0; i < 50; ++i)
{
activeValidators.insert(calcNodeID(*it));
++it;
}
validators->updateTrusted(activeValidators);
BEAST_EXPECT(validators->quorum() == 48);
hash_set<PublicKey> nUnl;
it = unl.begin();
for (std::uint32_t i = 0; i < 20; ++i)
{
nUnl.insert(*it);
++it;
}
validators->setNegativeUnl(nUnl);
validators->updateTrusted(activeValidators);
BEAST_EXPECT(validators->quorum() == 30);
}
}
}
public:
void
run() override
@@ -1276,6 +1455,7 @@ public:
testApplyList();
testUpdateTrusted();
testExpires();
testNegativeUNL();
}
};