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add a limit

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This commit is contained in:
Nathan Nichols
2021-05-14 09:45:31 -05:00
parent d2815ec32e
commit ed58095029
2 changed files with 15 additions and 5 deletions
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10
reporting/CassandraBackend.cpp
View File

@@ -502,11 +502,14 @@ CassandraBackend::fetchBookOffers(
std::optional<ripple::uint256> const& cursor) const
{
auto rng = fetchLedgerRange();
auto limitTuningFactor = 50;
if(!rng)
return {{},{}};
auto readBooks = [this, &book](std::uint32_t sequence)
auto readBooks =
[this, &book, &limit, &limitTuningFactor]
(std::uint32_t sequence)
-> std::pair<bool, std::vector<std::pair<std::uint64_t, ripple::uint256>>>
{
CassandraStatement completeQuery{completeBook_};
@@ -527,6 +530,8 @@ CassandraBackend::fetchBookOffers(
statement.bindBytes(zero.data(), 8);
statement.bindBytes(zero);
statement.bindUInt(limit * limitTuningFactor);
auto start = std::chrono::system_clock::now();
CassandraResult result = executeSyncRead(statement);
@@ -1550,7 +1555,8 @@ CassandraBackend::open(bool readOnly)
query << "SELECT quality_key FROM " << tablePrefix << "books "
<< " WHERE book = ? AND sequence = ?"
<< " AND quality_key >= (?, ?)"
" ORDER BY quality_key ASC";
" ORDER BY quality_key ASC "
" LIMIT ?";
if (!selectBook_.prepareStatement(query, session_.get()))
continue;

8
reporting/PostgresBackend.cpp
View File

@@ -379,6 +379,7 @@ PostgresBackend::fetchBookOffers(
std::optional<ripple::uint256> const& cursor) const
{
auto rng = fetchLedgerRange();
auto limitTuningFactor = 50;
if(!rng)
return {{},{}};
@@ -388,7 +389,9 @@ PostgresBackend::fetchBookOffers(
ripple::uint256 bookEnd = ripple::getQualityNext(bookBase);
using bookKeyPair = std::pair<ripple::uint256, ripple::uint256>;
auto getBooks = [this, &bookBase, &bookEnd, &limit](std::uint32_t sequence)
auto getBooks =
[this, &bookBase, &bookEnd, &limit, &limitTuningFactor]
(std::uint32_t sequence)
-> std::pair<bool, std::vector<bookKeyPair>>
{
BOOST_LOG_TRIVIAL(info) << __func__ << ": Fetching books between "
@@ -418,7 +421,8 @@ PostgresBackend::fetchBookOffers(
<< "\'\\x" << ripple::strHex(bookBase) << "\' "
<< "AND book < "
<< "\'\\x" << ripple::strHex(bookEnd) << "\' "
<< "ORDER BY book ASC";
<< "ORDER BY book ASC "
<< "LIMIT " << std::to_string(limit * limitTuningFactor);
BOOST_LOG_TRIVIAL(debug) << sql.str();