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coins: add Sync() method to allow flush without cacheCoins drop

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In certain circumstances, we may want to flush to disk without
emptying `cacheCoins`, which affects performance. UTXO snapshot
activation is one such case.

This method is currently unused and this commit does not
change any behavior.

Incorporates feedback from John Newbery.

Co-authored-by: Suhas Daftuar <sdaftuar@gmail.com>
This commit is contained in:
James O'Beirne
2019-12-03 13:25:35 -05:00
committed by James O'Beirne
parent c0b6c40bb0
commit 79cedc36af
5 changed files with 59 additions and 17 deletions
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5
src/txdb.cpp
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@@ -111,7 +111,7 @@ std::vector<uint256> CCoinsViewDB::GetHeadBlocks() const {
return vhashHeadBlocks;
}
bool CCoinsViewDB::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock) {
bool CCoinsViewDB::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock, bool erase) {
CDBBatch batch(*m_db);
size_t count = 0;
size_t changed = 0;
@@ -146,8 +146,7 @@ bool CCoinsViewDB::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock) {
changed++;
}
count++;
CCoinsMap::iterator itOld = it++;
mapCoins.erase(itOld);
it = erase ? mapCoins.erase(it) : std::next(it);
if (batch.SizeEstimate() > batch_size) {
LogPrint(BCLog::COINDB, "Writing partial batch of %.2f MiB\n", batch.SizeEstimate() * (1.0 / 1048576.0));
m_db->WriteBatch(batch);