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online delete for cassandra. doesn't crash, but not sure it works

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CJ Cobb
2021-05-11 21:14:47 +00:00
parent ca886fe2c8
commit 24816c021d
7 changed files with 197 additions and 16 deletions
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12
reporting/PostgresBackend.cpp
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@@ -874,14 +874,20 @@ PostgresBackend::writeBooks(
return true;
}
bool
PostgresBackend::doOnlineDelete(uint32_t minLedgerToKeep) const
PostgresBackend::doOnlineDelete(uint32_t numLedgersToKeep) const
{
auto rng = fetchLedgerRangeNoThrow();
if (!rng)
return false;
uint32_t minLedger = rng->maxSequence - numLedgersToKeep;
if (minLedger <= rng->minSequence)
return false;
uint32_t limit = 2048;
PgQuery pgQuery(pgPool_);
{
std::stringstream sql;
sql << "DELETE FROM ledgers WHERE ledger_seq < "
<< std::to_string(minLedgerToKeep);
<< std::to_string(minLedger);
auto res = pgQuery(sql.str().data());
if (res.msg() != "ok")
throw std::runtime_error("Error deleting from ledgers table");
@@ -892,7 +898,7 @@ PostgresBackend::doOnlineDelete(uint32_t minLedgerToKeep) const
{
std::stringstream sql;
sql << "SELECT DISTINCT ON (key) key,ledger_seq,object FROM objects"
<< " WHERE ledger_seq <= " << std::to_string(minLedgerToKeep);
<< " WHERE ledger_seq <= " << std::to_string(minLedger);
if (cursor.size())
sql << " AND key < \'\\x" << cursor << "\'";
sql << " ORDER BY key DESC, ledger_seq DESC"