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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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12
reporting/CassandraBackend.cpp
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@@ -502,12 +502,15 @@ 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)
-> std::pair<bool, std::vector<std::pair<std::uint64_t, ripple::uint256>>>
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_};
completeQuery.bindInt(sequence);
@@ -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;