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Track failures in fee estimation.

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Start tracking transactions which fail to confirm within the target and are then evicted or otherwise leave mempool.

Fix slight error in unit test.
pull/365/head
Alex Morcos 8 years ago
parent 4186d3fdfd
commit c7447ec303
6 changed files with 72 additions and 20 deletions
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1
src/init.cpp
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@ -213,6 +213,7 @@ void Shutdown()
if (fFeeEstimatesInitialized)
{
::feeEstimator.FlushUnconfirmed(::mempool);
fs::path est_path = GetDataDir() / FEE_ESTIMATES_FILENAME;
CAutoFile est_fileout(fsbridge::fopen(est_path, "wb"), SER_DISK, CLIENT_VERSION);
if (!est_fileout.IsNull())

72
src/policy/fees.cpp
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@ -40,7 +40,9 @@ private:
// Track the historical moving average of theses totals over blocks
std::vector<std::vector<double>> confAvg; // confAvg[Y][X]
std::vector<std::vector<double>> failAvg; // future use
// Track moving avg of txs which have been evicted from the mempool
// after failing to be confirmed within Y blocks
std::vector<std::vector<double>> failAvg; // failAvg[Y][X]
// Sum the total feerate of all tx's in each bucket
// Track the historical moving average of this total over blocks
@ -89,7 +91,7 @@ public:
/** Remove a transaction from mempool tracking stats*/
void removeTx(unsigned int entryHeight, unsigned int nBestSeenHeight,
unsigned int bucketIndex);
unsigned int bucketIndex, bool inBlock);
/** Update our estimates by decaying our historical moving average and updating
with the data gathered from the current block */
@ -135,6 +137,10 @@ TxConfirmStats::TxConfirmStats(const std::vector<double>& defaultBuckets,
for (unsigned int i = 0; i < maxConfirms; i++) {
confAvg[i].resize(buckets.size());
}
failAvg.resize(maxConfirms);
for (unsigned int i = 0; i < maxConfirms; i++) {
failAvg[i].resize(buckets.size());
}
txCtAvg.resize(buckets.size());
avg.resize(buckets.size());
@ -179,6 +185,8 @@ void TxConfirmStats::UpdateMovingAverages()
for (unsigned int j = 0; j < buckets.size(); j++) {
for (unsigned int i = 0; i < confAvg.size(); i++)
confAvg[i][j] = confAvg[i][j] * decay;
for (unsigned int i = 0; i < failAvg.size(); i++)
failAvg[i][j] = failAvg[i][j] * decay;
avg[j] = avg[j] * decay;
txCtAvg[j] = txCtAvg[j] * decay;
}
@ -193,6 +201,7 @@ double TxConfirmStats::EstimateMedianVal(int confTarget, double sufficientTxVal,
double nConf = 0; // Number of tx's confirmed within the confTarget
double totalNum = 0; // Total number of tx's that were ever confirmed
int extraNum = 0; // Number of tx's still in mempool for confTarget or longer
double failNum = 0; // Number of tx's that were never confirmed but removed from the mempool after confTarget
int maxbucketindex = buckets.size() - 1;
@ -229,6 +238,7 @@ double TxConfirmStats::EstimateMedianVal(int confTarget, double sufficientTxVal,
curFarBucket = bucket;
nConf += confAvg[confTarget - 1][bucket];
totalNum += txCtAvg[bucket];
failNum += failAvg[confTarget - 1][bucket];
for (unsigned int confct = confTarget; confct < GetMaxConfirms(); confct++)
extraNum += unconfTxs[(nBlockHeight - confct)%bins][bucket];
extraNum += oldUnconfTxs[bucket];
@ -237,7 +247,7 @@ double TxConfirmStats::EstimateMedianVal(int confTarget, double sufficientTxVal,
// (Only count the confirmed data points, so that each confirmation count
// will be looking at the same amount of data and same bucket breaks)
if (totalNum >= sufficientTxVal / (1 - decay)) {
double curPct = nConf / (totalNum + extraNum);
double curPct = nConf / (totalNum + failNum + extraNum);
// Check to see if we are no longer getting confirmed at the success rate
if ((requireGreater && curPct < successBreakPoint) || (!requireGreater && curPct > successBreakPoint)) {
@ -250,6 +260,7 @@ double TxConfirmStats::EstimateMedianVal(int confTarget, double sufficientTxVal,
failBucket.withinTarget = nConf;
failBucket.totalConfirmed = totalNum;
failBucket.inMempool = extraNum;
failBucket.leftMempool = failNum;
passing = false;
}
continue;
@ -265,6 +276,8 @@ double TxConfirmStats::EstimateMedianVal(int confTarget, double sufficientTxVal,
passBucket.totalConfirmed = totalNum;
totalNum = 0;
passBucket.inMempool = extraNum;
passBucket.leftMempool = failNum;
failNum = 0;
extraNum = 0;
bestNearBucket = curNearBucket;
bestFarBucket = curFarBucket;
@ -309,16 +322,17 @@ double TxConfirmStats::EstimateMedianVal(int confTarget, double sufficientTxVal,
failBucket.withinTarget = nConf;
failBucket.totalConfirmed = totalNum;
failBucket.inMempool = extraNum;
failBucket.leftMempool = failNum;
}
LogPrint(BCLog::ESTIMATEFEE, "FeeEst: %d %s%.0f%% decay %.5f: need feerate: %g from (%g - %g) %.2f%% %.1f/(%.1f+%d mem) Fail: (%g - %g) %.2f%% %.1f/(%.1f+%d mem)\n",
LogPrint(BCLog::ESTIMATEFEE, "FeeEst: %d %s%.0f%% decay %.5f: need feerate: %g from (%g - %g) %.2f%% %.1f/(%.1f+%d mem+%.1f out) Fail: (%g - %g) %.2f%% %.1f/(%.1f+%d mem+%.1f out)\n",
confTarget, requireGreater ? ">" : "<", 100.0 * successBreakPoint, decay,
median, passBucket.start, passBucket.end,
100 * passBucket.withinTarget / (passBucket.totalConfirmed + passBucket.inMempool),
passBucket.withinTarget, passBucket.totalConfirmed, passBucket.inMempool,
100 * passBucket.withinTarget / (passBucket.totalConfirmed + passBucket.inMempool + passBucket.leftMempool),
passBucket.withinTarget, passBucket.totalConfirmed, passBucket.inMempool, passBucket.leftMempool,
failBucket.start, failBucket.end,
100 * failBucket.withinTarget / (failBucket.totalConfirmed + failBucket.inMempool),
failBucket.withinTarget, failBucket.totalConfirmed, failBucket.inMempool);
100 * failBucket.withinTarget / (failBucket.totalConfirmed + failBucket.inMempool + failBucket.leftMempool),
failBucket.withinTarget, failBucket.totalConfirmed, failBucket.inMempool, failBucket.leftMempool);
if (result) {
@ -376,6 +390,19 @@ void TxConfirmStats::Read(CAutoFile& filein, int nFileVersion, size_t numBuckets
if (nFileVersion >= 149900) {
filein >> failAvg;
if (maxConfirms != failAvg.size()) {
throw std::runtime_error("Corrupt estimates file. Mismatch in confirms tracked for failures");
}
for (unsigned int i = 0; i < maxConfirms; i++) {
if (failAvg[i].size() != numBuckets) {
throw std::runtime_error("Corrupt estimates file. Mismatch in one of failure average bucket counts");
}
}
} else {
failAvg.resize(confAvg.size());
for (unsigned int i = 0; i < failAvg.size(); i++) {
failAvg[i].resize(numBuckets);
}
}
// Resize the current block variables which aren't stored in the data file
@ -394,7 +421,7 @@ unsigned int TxConfirmStats::NewTx(unsigned int nBlockHeight, double val)
return bucketindex;
}
void TxConfirmStats::removeTx(unsigned int entryHeight, unsigned int nBestSeenHeight, unsigned int bucketindex)
void TxConfirmStats::removeTx(unsigned int entryHeight, unsigned int nBestSeenHeight, unsigned int bucketindex, bool inBlock)
{
//nBestSeenHeight is not updated yet for the new block
int blocksAgo = nBestSeenHeight - entryHeight;
@ -422,6 +449,11 @@ void TxConfirmStats::removeTx(unsigned int entryHeight, unsigned int nBestSeenHe
blockIndex, bucketindex);
}
}
if (!inBlock && blocksAgo >= 1) {
for (size_t i = 0; i < blocksAgo && i < failAvg.size(); i++) {
failAvg[i][bucketindex]++;
}
}
}
// This function is called from CTxMemPool::removeUnchecked to ensure
@ -429,14 +461,14 @@ void TxConfirmStats::removeTx(unsigned int entryHeight, unsigned int nBestSeenHe
// tracked. Txs that were part of a block have already been removed in
// processBlockTx to ensure they are never double tracked, but it is
// of no harm to try to remove them again.
bool CBlockPolicyEstimator::removeTx(uint256 hash)
bool CBlockPolicyEstimator::removeTx(uint256 hash, bool inBlock)
{
LOCK(cs_feeEstimator);
std::map<uint256, TxStatsInfo>::iterator pos = mapMemPoolTxs.find(hash);
if (pos != mapMemPoolTxs.end()) {
feeStats->removeTx(pos->second.blockHeight, nBestSeenHeight, pos->second.bucketIndex);
shortStats->removeTx(pos->second.blockHeight, nBestSeenHeight, pos->second.bucketIndex);
longStats->removeTx(pos->second.blockHeight, nBestSeenHeight, pos->second.bucketIndex);
feeStats->removeTx(pos->second.blockHeight, nBestSeenHeight, pos->second.bucketIndex, inBlock);
shortStats->removeTx(pos->second.blockHeight, nBestSeenHeight, pos->second.bucketIndex, inBlock);
longStats->removeTx(pos->second.blockHeight, nBestSeenHeight, pos->second.bucketIndex, inBlock);
mapMemPoolTxs.erase(hash);
return true;
} else {
@ -511,7 +543,7 @@ void CBlockPolicyEstimator::processTransaction(const CTxMemPoolEntry& entry, boo
bool CBlockPolicyEstimator::processBlockTx(unsigned int nBlockHeight, const CTxMemPoolEntry* entry)
{
if (!removeTx(entry->GetTx().GetHash())) {
if (!removeTx(entry->GetTx().GetHash(), true)) {
// This transaction wasn't being tracked for fee estimation
return false;
}
@ -766,6 +798,18 @@ bool CBlockPolicyEstimator::Read(CAutoFile& filein)
return true;
}
void CBlockPolicyEstimator::FlushUnconfirmed(CTxMemPool& pool) {
int64_t startclear = GetTimeMicros();
std::vector<uint256> txids;
pool.queryHashes(txids);
LOCK(cs_feeEstimator);
for (auto& txid : txids) {
removeTx(txid, false);
}
int64_t endclear = GetTimeMicros();
LogPrint(BCLog::ESTIMATEFEE, "Recorded %u unconfirmed txs from mempool in %ld micros\n",txids.size(), endclear - startclear);
}
FeeFilterRounder::FeeFilterRounder(const CFeeRate& minIncrementalFee)
{
CAmount minFeeLimit = std::max(CAmount(1), minIncrementalFee.GetFeePerK() / 2);

6
src/policy/fees.h
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@ -74,6 +74,7 @@ struct EstimatorBucket
double withinTarget = 0;
double totalConfirmed = 0;
double inMempool = 0;
double leftMempool = 0;
};
struct EstimationResult
@ -145,7 +146,7 @@ public:
void processTransaction(const CTxMemPoolEntry& entry, bool validFeeEstimate);
/** Remove a transaction from the mempool tracking stats*/
bool removeTx(uint256 hash);
bool removeTx(uint256 hash, bool inBlock);
/** Return a feerate estimate */
CFeeRate estimateFee(int confTarget) const;
@ -166,6 +167,9 @@ public:
/** Read estimation data from a file */
bool Read(CAutoFile& filein);
/** Empty mempool transactions on shutdown to record failure to confirm for txs still in mempool */
void FlushUnconfirmed(CTxMemPool& pool);
private:
CFeeRate minTrackedFee; //!< Passed to constructor to avoid dependency on main
unsigned int nBestSeenHeight;

3
src/rpc/mining.cpp
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@ -893,6 +893,7 @@ UniValue estimaterawfee(const JSONRPCRequest& request)
" \"withintarget\" : x.x, (numeric) number of txs over history horizon in the feerate range that were confirmed within target\n"
" \"totalconfirmed\" : x.x, (numeric) number of txs over history horizon in the feerate range that were confirmed at any point\n"
" \"inmempool\" : x.x, (numeric) current number of txs in mempool in the feerate range unconfirmed for at least target blocks\n"
" \"leftmempool\" : x.x, (numeric) number of txs over history horizon in the feerate range that left mempool unconfirmed after target\n"
"}\n"
"\n"
"A negative feerate is returned if no answer can be given.\n"
@ -927,11 +928,13 @@ UniValue estimaterawfee(const JSONRPCRequest& request)
result.push_back(Pair("pass.withintarget", round(buckets.pass.withinTarget * 100.0) / 100.0));
result.push_back(Pair("pass.totalconfirmed", round(buckets.pass.totalConfirmed * 100.0) / 100.0));
result.push_back(Pair("pass.inmempool", round(buckets.pass.inMempool * 100.0) / 100.0));
result.push_back(Pair("pass.leftmempool", round(buckets.pass.leftMempool * 100.0) / 100.0));
result.push_back(Pair("fail.startrange", round(buckets.fail.start)));
result.push_back(Pair("fail.endrange", round(buckets.fail.end)));
result.push_back(Pair("fail.withintarget", round(buckets.fail.withinTarget * 100.0) / 100.0));
result.push_back(Pair("fail.totalconfirmed", round(buckets.fail.totalConfirmed * 100.0) / 100.0));
result.push_back(Pair("fail.inmempool", round(buckets.fail.inMempool * 100.0) / 100.0));
result.push_back(Pair("fail.leftmempool", round(buckets.fail.leftMempool * 100.0) / 100.0));
return result;
}

8
src/test/policyestimator_tests.cpp
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@ -159,16 +159,16 @@ BOOST_AUTO_TEST_CASE(BlockPolicyEstimates)
txHashes[j].pop_back();
}
}
mpool.removeForBlock(block, 265);
mpool.removeForBlock(block, 266);
block.clear();
BOOST_CHECK(feeEst.estimateFee(1) == CFeeRate(0));
for (int i = 2; i < 10;i++) {
BOOST_CHECK(feeEst.estimateFee(i).GetFeePerK() > origFeeEst[i-1] - deltaFee);
BOOST_CHECK(feeEst.estimateFee(i) == CFeeRate(0) || feeEst.estimateFee(i).GetFeePerK() > origFeeEst[i-1] - deltaFee);
}
// Mine 200 more blocks where everything is mined every block
// Mine 400 more blocks where everything is mined every block
// Estimates should be below original estimates
while (blocknum < 465) {
while (blocknum < 665) {
for (int j = 0; j < 10; j++) { // For each fee multiple
for (int k = 0; k < 4; k++) { // add 4 fee txs
tx.vin[0].prevout.n = 10000*blocknum+100*j+k;

2
src/txmempool.cpp
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@ -448,7 +448,7 @@ void CTxMemPool::removeUnchecked(txiter it, MemPoolRemovalReason reason)
mapLinks.erase(it);
mapTx.erase(it);
nTransactionsUpdated++;
if (minerPolicyEstimator) {minerPolicyEstimator->removeTx(hash);}
if (minerPolicyEstimator) {minerPolicyEstimator->removeTx(hash, false);}
}
// Calculates descendants of entry that are not already in setDescendants, and adds to

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