Postgres fixes (#84)

* Postgres fixes

* Create partial index for ledger_diffs, to avoid indexing the first
  ledger's objects

* Don't write duplicate keys to successor table

* default to 4 markers when syncing cache

* remove isFirst from writeLedger interface

src/backend/BackendInterface.cpp

@@ -8,16 +8,8 @@ BackendInterface::finishWrites(uint32_t ledgerSequence)
     auto commitRes = doFinishWrites();
     if (commitRes)
     {
-        isFirst_ = false;
         updateRange(ledgerSequence);
     }
-    else
-    {
-        // if commitRes is false, we are relinquishing control of ETL. We
-        // reset isFirst_ to true so that way if we later regain control of
-        // ETL, we trigger the index repair
-        isFirst_ = true;
-    }
     return commitRes;
 }
 void
@@ -242,8 +234,9 @@ BackendInterface::fetchLedgerPage(
     std::vector<ripple::uint256> keys;
     while (keys.size() < limit)
     {
-        ripple::uint256 const& curCursor =
-            keys.size() ? keys.back() : cursor ? *cursor : firstKey;
+        ripple::uint256 const& curCursor = keys.size() ? keys.back()
+            : cursor                                   ? *cursor
+                                                       : firstKey;
         auto succ = fetchSuccessorKey(curCursor, ledgerSequence);
         if (!succ)
             break;

src/backend/BackendInterface.h

@@ -19,7 +19,6 @@ class DatabaseTimeout : public std::exception
 class BackendInterface
 {
 protected:
-    bool isFirst_ = true;
     std::optional<LedgerRange> range;
     SimpleCache cache_;
 
@@ -153,8 +152,7 @@ public:
     virtual void
     writeLedger(
         ripple::LedgerInfo const& ledgerInfo,
-        std::string&& ledgerHeader,
-        bool isFirst = false) = 0;
+        std::string&& ledgerHeader) = 0;
 
     void
     writeLedgerObject(std::string&& key, uint32_t seq, std::string&& blob);

src/backend/CassandraBackend.cpp

@@ -151,7 +151,7 @@ CassandraBackend::doWriteLedgerObject(
     std::string&& blob)
 {
     BOOST_LOG_TRIVIAL(trace) << "Writing ledger object to cassandra";
-    if (!isFirst_)
+    if (range)
         makeAndExecuteAsyncWrite(
             this, std::move(std::make_tuple(seq, key)), [this](auto& params) {
                 auto& [sequence, key] = params.data;
@@ -201,8 +201,7 @@ CassandraBackend::writeSuccessor(
 void
 CassandraBackend::writeLedger(
     ripple::LedgerInfo const& ledgerInfo,
-    std::string&& header,
-    bool isFirst)
+    std::string&& header)
 {
     makeAndExecuteAsyncWrite(
         this,
@@ -225,7 +224,6 @@ CassandraBackend::writeLedger(
             return statement;
         });
     ledgerSequence_ = ledgerInfo.seq;
-    isFirstLedger_ = isFirst;
 }
 void
 CassandraBackend::writeAccountTransactions(
@@ -462,10 +460,9 @@ CassandraBackend::fetchAccountTransactions(
     {
         statement.bindNextIntTuple(
             cursor->ledgerSequence, cursor->transactionIndex);
-        BOOST_LOG_TRIVIAL(debug)
-            << " account = " << ripple::strHex(account)
-            << " tuple = " << cursor->ledgerSequence << " : "
-            << cursor->transactionIndex;
+        BOOST_LOG_TRIVIAL(debug) << " account = " << ripple::strHex(account)
+                                 << " tuple = " << cursor->ledgerSequence
+                                 << " : " << cursor->transactionIndex;
     }
     else
     {
@@ -474,8 +471,8 @@ CassandraBackend::fetchAccountTransactions(
 
         statement.bindNextIntTuple(placeHolder, placeHolder);
         BOOST_LOG_TRIVIAL(debug)
-            << " account = " << ripple::strHex(account)
-            << " idx = " << seq << " tuple = " << placeHolder;
+            << " account = " << ripple::strHex(account) << " idx = " << seq
+            << " tuple = " << placeHolder;
     }
     statement.bindNextUInt(limit);
 

src/backend/CassandraBackend.h

@@ -597,7 +597,6 @@ private:
     boost::json::object config_;
 
     mutable uint32_t ledgerSequence_ = 0;
-    mutable bool isFirstLedger_ = false;
 
 public:
     CassandraBackend(boost::json::object const& config)
@@ -648,7 +647,7 @@ public:
         // wait for all other writes to finish
         sync();
         // write range
-        if (isFirstLedger_)
+        if (!range)
         {
             CassandraStatement statement{updateLedgerRange_};
             statement.bindNextInt(ledgerSequence_);
@@ -672,10 +671,8 @@ public:
         return true;
     }
     void
-    writeLedger(
-        ripple::LedgerInfo const& ledgerInfo,
-        std::string&& header,
-        bool isFirst = false) override;
+    writeLedger(ripple::LedgerInfo const& ledgerInfo, std::string&& header)
+        override;
 
     std::optional<uint32_t>
     fetchLatestLedgerSequence() const override

src/backend/Pg.cpp

@@ -773,8 +773,6 @@ CREATE TABLE IF NOT EXISTS objects (
 
 CREATE INDEX objects_idx ON objects USING btree(key,ledger_seq);
 
-CREATE INDEX diff ON objects USING hash(ledger_seq);
-
 create table if not exists objects1 partition of objects for values from (0) to (10000000);
 create table if not exists objects2 partition of objects for values from (10000000) to (20000000);
 create table if not exists objects3 partition of objects for values from (20000000) to (30000000);

src/backend/PostgresBackend.cpp

@@ -17,8 +17,7 @@ PostgresBackend::PostgresBackend(boost::json::object const& config)
 void
 PostgresBackend::writeLedger(
     ripple::LedgerInfo const& ledgerInfo,
-    std::string&& ledgerHeader,
-    bool isFirst)
+    std::string&& ledgerHeader)
 {
     auto cmd = boost::format(
         R"(INSERT INTO ledgers
@@ -35,6 +34,7 @@ PostgresBackend::writeLedger(
 
     auto res = writeConnection_(ledgerInsert.data());
     abortWrite_ = !res;
+    inProcessLedger = ledgerInfo.seq;
 }
 
 void
@@ -88,9 +88,17 @@ PostgresBackend::writeSuccessor(
     uint32_t seq,
     std::string&& successor)
 {
+    if (range)
+    {
+        if (successors_.count(key) > 0)
+            return;
+        successors_.insert(key);
+    }
     successorBuffer_ << "\\\\x" << ripple::strHex(key) << '\t'
                      << std::to_string(seq) << '\t' << "\\\\x"
                      << ripple::strHex(successor) << '\n';
+    BOOST_LOG_TRIVIAL(trace)
+        << __func__ << ripple::strHex(key) << " - " << std::to_string(seq);
     numRowsInSuccessorBuffer_++;
     if (numRowsInSuccessorBuffer_ % writeInterval_ == 0)
     {
@@ -532,7 +540,7 @@ PostgresBackend::fetchLedgerDiff(uint32_t ledgerSequence) const
            "WHERE "
         << "ledger_seq = " << std::to_string(ledgerSequence);
     auto res = pgQuery(sql.str().data());
-    if (size_t numRows = checkResult(res, 4))
+    if (size_t numRows = checkResult(res, 2))
     {
         std::vector<LedgerObject> objects;
         for (size_t i = 0; i < numRows; ++i)
@@ -666,6 +674,17 @@ PostgresBackend::doFinishWrites()
         std::string successorStr = successorBuffer_.str();
         if (successorStr.size())
             writeConnection_.bulkInsert("successor", successorStr);
+        successors_.clear();
+        if (!range)
+        {
+            std::stringstream indexCreate;
+            indexCreate
+                << "CREATE INDEX diff ON objects USING hash(ledger_seq) "
+                   "WHERE NOT "
+                   "ledger_seq = "
+                << std::to_string(inProcessLedger);
+            writeConnection_(indexCreate.str().data());
+        }
     }
     auto res = writeConnection_("COMMIT");
     if (!res || res.status() != PGRES_COMMAND_OK)

src/backend/PostgresBackend.h

@@ -11,7 +11,6 @@ private:
     mutable std::stringstream objectsBuffer_;
     mutable size_t numRowsInSuccessorBuffer_ = 0;
     mutable std::stringstream successorBuffer_;
-    mutable std::stringstream keysBuffer_;
     mutable std::stringstream transactionsBuffer_;
     mutable std::stringstream accountTxBuffer_;
     std::shared_ptr<PgPool> pgPool_;
@@ -19,6 +18,8 @@ private:
     mutable bool abortWrite_ = false;
     mutable boost::asio::thread_pool pool_{16};
     uint32_t writeInterval_ = 1000000;
+    uint32_t inProcessLedger = 0;
+    std::unordered_set<std::string> successors_;
 
 public:
     PostgresBackend(boost::json::object const& config);
@@ -75,8 +76,7 @@ public:
     void
     writeLedger(
         ripple::LedgerInfo const& ledgerInfo,
-        std::string&& ledgerHeader,
-        bool isFirst) override;
+        std::string&& ledgerHeader) override;
 
     void
     doWriteLedgerObject(std::string&& key, uint32_t seq, std::string&& blob)

src/etl/ETLSource.cpp

@@ -599,6 +599,11 @@ public:
         for (int i = 0; i < cur_->ledger_objects().objects_size(); ++i)
         {
             auto& obj = *(cur_->mutable_ledger_objects()->mutable_objects(i));
+            if (!more)
+            {
+                if (((unsigned char)obj.key()[0]) >= nextPrefix_)
+                    continue;
+            }
             cacheUpdates.push_back(
                 {*ripple::uint256::fromVoidChecked(obj.key()),
                  {obj.mutable_data()->begin(), obj.mutable_data()->end()}});
@@ -743,6 +748,9 @@ ETLSourceImpl<Derived>::loadInitialLedger(
             auto start = std::chrono::system_clock::now();
             for (auto& key : edgeKeys)
             {
+                BOOST_LOG_TRIVIAL(debug)
+                    << __func__
+                    << " writing edge key = " << ripple::strHex(key);
                 auto succ = backend_->cache().getSuccessor(
                     *ripple::uint256::fromVoidChecked(key), sequence);
                 if (succ)
@@ -761,18 +769,23 @@ ETLSourceImpl<Derived>::loadInitialLedger(
                 if (isBookDir(cur->key, cur->blob))
                 {
                     auto base = getBookBase(cur->key);
-                    auto succ = backend_->cache().getSuccessor(base, sequence);
-                    assert(succ);
-                    if (succ->key == cur->key)
+                    // make sure the base is not an actual object
+                    if (!backend_->cache().get(cur->key, sequence))
                     {
-                        BOOST_LOG_TRIVIAL(debug)
-                            << __func__ << " Writing book successor = "
-                            << ripple::strHex(base) << " - "
-                            << ripple::strHex(cur->key);
-                        backend_->writeSuccessor(
-                            uint256ToString(base),
-                            sequence,
-                            uint256ToString(cur->key));
+                        auto succ =
+                            backend_->cache().getSuccessor(base, sequence);
+                        assert(succ);
+                        if (succ->key == cur->key)
+                        {
+                            BOOST_LOG_TRIVIAL(debug)
+                                << __func__ << " Writing book successor = "
+                                << ripple::strHex(base) << " - "
+                                << ripple::strHex(cur->key);
+                            backend_->writeSuccessor(
+                                uint256ToString(base),
+                                sequence,
+                                uint256ToString(cur->key));
+                        }
                     }
                     ++numWrites;
                 }
@@ -848,6 +861,10 @@ ETLLoadBalancer::ETLLoadBalancer(
 
         downloadRanges_ = std::clamp(downloadRanges_, {1}, {256});
     }
+    else if (backend->fetchLedgerRange())
+    {
+        downloadRanges_ = 4;
+    }
 
     for (auto& entry : config.at("etl_sources").as_array())
     {
@@ -923,7 +940,9 @@ ETLLoadBalancer::fetchLedger(
 }
 
 std::optional<boost::json::object>
-ETLLoadBalancer::forwardToRippled(boost::json::object const& request, std::string const& clientIp) const
+ETLLoadBalancer::forwardToRippled(
+    boost::json::object const& request,
+    std::string const& clientIp) const
 {
     srand((unsigned)time(0));
     auto sourceIdx = rand() % sources_.size();
@@ -942,7 +961,8 @@ ETLLoadBalancer::forwardToRippled(boost::json::object const& request, std::strin
 template <class Derived>
 std::optional<boost::json::object>
 ETLSourceImpl<Derived>::forwardToRippled(
-    boost::json::object const& request, std::string const& clientIp) const
+    boost::json::object const& request,
+    std::string const& clientIp) const
 {
     BOOST_LOG_TRIVIAL(debug) << "Attempting to forward request to tx. "
                              << "request = " << boost::json::serialize(request);
@@ -983,17 +1003,14 @@ ETLSourceImpl<Derived>::forwardToRippled(
         //
         // https://github.com/ripple/rippled/blob/develop/cfg/rippled-example.cfg
         ws->set_option(websocket::stream_base::decorator(
-            [&request,&clientIp] (websocket::request_type& req) {
+            [&request, &clientIp](websocket::request_type& req) {
                 req.set(
                     http::field::user_agent,
                     std::string(BOOST_BEAST_VERSION_STRING) +
                         " websocket-client-coro");
-                req.set(
-                    http::field::forwarded,
-                    "for=" + clientIp);
+                req.set(http::field::forwarded, "for=" + clientIp);
             }));
-        BOOST_LOG_TRIVIAL(debug)
-            << "client ip: " << clientIp;
+        BOOST_LOG_TRIVIAL(debug) << "client ip: " << clientIp;
 
         BOOST_LOG_TRIVIAL(debug) << "Performing websocket handshake";
         // Perform the websocket handshake

src/etl/ReportingETL.cpp

@@ -11,8 +11,8 @@
 #include <iostream>
 #include <string>
 #include <subscriptions/SubscriptionManager.h>
-#include <variant>
 #include <thread>
+#include <variant>
 
 namespace detail {
 /// Convenience function for printing out basic ledger info
@@ -101,7 +101,7 @@ ReportingETL::loadInitialLedger(uint32_t startingSequence)
     backend_->startWrites();
     BOOST_LOG_TRIVIAL(debug) << __func__ << " started writes";
     backend_->writeLedger(
-        lgrInfo, std::move(*ledgerData->mutable_ledger_header()), true);
+        lgrInfo, std::move(*ledgerData->mutable_ledger_header()));
     BOOST_LOG_TRIVIAL(debug) << __func__ << " wrote ledger";
     std::vector<AccountTransactionsData> accountTxData =
         insertTransactions(lgrInfo, *ledgerData);
@@ -864,14 +864,14 @@ ReportingETL::monitorReadOnly()
     if (!mostRecent)
         return;
     uint32_t sequence = *mostRecent;
+    std::thread t{[this, sequence]() {
+        BOOST_LOG_TRIVIAL(info) << "Loading cache";
+        loadBalancer_->loadInitialLedger(sequence, true);
+    }};
+    t.detach();
     while (!stopping_ &&
            networkValidatedLedgers_->waitUntilValidatedByNetwork(sequence))
     {
-        std::thread t{[this, sequence]() {
-            BOOST_LOG_TRIVIAL(info) << "Loading cache";
-            loadBalancer_->loadInitialLedger(sequence, true);
-        }};
-        t.detach();
         publishLedger(sequence, {});
         ++sequence;
     }

unittests/main.cpp

@@ -85,7 +85,7 @@ TEST(BackendTest, Basic)
             deserializeHeader(ripple::makeSlice(rawHeaderBlob));
 
         backend->startWrites();
-        backend->writeLedger(lgrInfo, std::move(rawHeaderBlob), true);
+        backend->writeLedger(lgrInfo, std::move(rawHeaderBlob));
         backend->writeSuccessor(
             uint256ToString(Backend::firstKey),
             lgrInfo.seq,
@@ -1590,7 +1590,7 @@ TEST(Backend, CacheIntegration)
             deserializeHeader(ripple::makeSlice(rawHeaderBlob));
 
         backend->startWrites();
-        backend->writeLedger(lgrInfo, std::move(rawHeaderBlob), true);
+        backend->writeLedger(lgrInfo, std::move(rawHeaderBlob));
         backend->writeSuccessor(
             uint256ToString(Backend::firstKey),
             lgrInfo.seq,