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Select orphan transaction uniformly for eviction

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The previous code was biased towards evicting transactions whose txid has
a larger gap (lexicographically) with the previous txid in the orphan pool.
This commit is contained in:
Pieter Wuille 2018-10-31 17:24:38 -07:00
parent 9a43344430
commit 7257353b93
1 changed files with 19 additions and 6 deletions
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25
src/net_processing.cpp
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@ -69,6 +69,7 @@ struct COrphanTx {
CTransactionRef tx;
NodeId fromPeer;
int64_t nTimeExpire;
size_t list_pos;
};
CCriticalSection g_cs_orphans;
std::map<uint256, COrphanTx> mapOrphanTransactions GUARDED_BY(g_cs_orphans);
@ -170,6 +171,8 @@ namespace {
};
std::map<COutPoint, std::set<std::map<uint256, COrphanTx>::iterator, IteratorComparator>> mapOrphanTransactionsByPrev GUARDED_BY(g_cs_orphans);
std::vector<std::map<uint256, COrphanTx>::iterator> g_orphan_list GUARDED_BY(g_cs_orphans); //! For random eviction
static size_t vExtraTxnForCompactIt GUARDED_BY(g_cs_orphans) = 0;
static std::vector<std::pair<uint256, CTransactionRef>> vExtraTxnForCompact GUARDED_BY(g_cs_orphans);
} // namespace
@ -706,8 +709,9 @@ bool AddOrphanTx(const CTransactionRef& tx, NodeId peer) EXCLUSIVE_LOCKS_REQUIRE
return false;
}
auto ret = mapOrphanTransactions.emplace(hash, COrphanTx{tx, peer, GetTime() + ORPHAN_TX_EXPIRE_TIME});
auto ret = mapOrphanTransactions.emplace(hash, COrphanTx{tx, peer, GetTime() + ORPHAN_TX_EXPIRE_TIME, g_orphan_list.size()});
assert(ret.second);
g_orphan_list.push_back(ret.first);
for (const CTxIn& txin : tx->vin) {
mapOrphanTransactionsByPrev[txin.prevout].insert(ret.first);
}
@ -733,6 +737,18 @@ int static EraseOrphanTx(uint256 hash) EXCLUSIVE_LOCKS_REQUIRED(g_cs_orphans)
if (itPrev->second.empty())
mapOrphanTransactionsByPrev.erase(itPrev);
}
size_t old_pos = it->second.list_pos;
assert(g_orphan_list[old_pos] == it);
if (old_pos + 1 != g_orphan_list.size()) {
// Unless we're deleting the last entry in g_orphan_list, move the last
// entry to the position we're deleting.
auto it_last = g_orphan_list.back();
g_orphan_list[old_pos] = it_last;
it_last->second.list_pos = old_pos;
}
g_orphan_list.pop_back();
mapOrphanTransactions.erase(it);
return 1;
}
@ -783,11 +799,8 @@ unsigned int LimitOrphanTxSize(unsigned int nMaxOrphans)
while (mapOrphanTransactions.size() > nMaxOrphans)
{
// Evict a random orphan:
uint256 randomhash = rng.rand256();
std::map<uint256, COrphanTx>::iterator it = mapOrphanTransactions.lower_bound(randomhash);
if (it == mapOrphanTransactions.end())
it = mapOrphanTransactions.begin();
EraseOrphanTx(it->first);
size_t randompos = rng.randrange(g_orphan_list.size());
EraseOrphanTx(g_orphan_list[randompos]->first);
++nEvicted;
}
return nEvicted;