Revert "Apply transaction batches in periodic intervals (XRPLF#4504)"

This reverts commit 002893f.

Therefore two files with conflicts in the automated revert:
- src/ripple/rpc/impl/RPCHelpers.h and
- src/test/rpc/JSONRPC_test.cpp
Those files were manually resolved.

There is currently no evidence that any problems were introduced
by XRPLF#4504.  However something is misbehaving on the current state
of develop, and pull request XRPLF#4504 was identified as a possible
suspect.

Builds/CMake/RippledCore.cmake

@@ -201,7 +201,6 @@ install (
     src/ripple/basics/StringUtilities.h
     src/ripple/basics/TaggedCache.h
     src/ripple/basics/tagged_integer.h
-    src/ripple/basics/SubmitSync.h
     src/ripple/basics/ThreadSafetyAnalysis.h
     src/ripple/basics/ToString.h
     src/ripple/basics/UnorderedContainers.h

cfg/rippled-example.cfg

@@ -482,7 +482,7 @@
 #
 #   Configure the maximum number of transactions to have in the job queue
 #
-#   Must be a number between 1000 and 100000, defaults to 10000
+#   Must be a number between 100 and 1000, defaults to 250
 #
 #
 # [overlay]

cfg/rippled-reporting.cfg

@@ -454,7 +454,7 @@
 #
 #   Configure the maximum number of transactions to have in the job queue
 #
-#   Must be a number between 1000 and 100000, defaults to 10000
+#   Must be a number between 100 and 1000, defaults to 250
 #
 #
 # [overlay]

src/ripple/app/ledger/impl/LedgerMaster.cpp

@@ -549,25 +549,22 @@ void
 LedgerMaster::applyHeldTransactions()
 {
     std::lock_guard sl(m_mutex);
-    // It can be expensive to modify the open ledger even with no transactions
-    // to process. Regardless, make sure to reset held transactions with
-    // the parent.
-    if (mHeldTransactions.size())
-    {
-        app_.openLedger().modify([&](OpenView& view, beast::Journal j) {
-            bool any = false;
-            for (auto const& it : mHeldTransactions)
-            {
-                ApplyFlags flags = tapNONE;
-                auto const result =
-                    app_.getTxQ().apply(app_, view, it.second, flags, j);
-                if (result.second)
-                    any = true;
-            }
-            return any;
-        });
-    }
 
+    app_.openLedger().modify([&](OpenView& view, beast::Journal j) {
+        bool any = false;
+        for (auto const& it : mHeldTransactions)
+        {
+            ApplyFlags flags = tapNONE;
+            auto const result =
+                app_.getTxQ().apply(app_, view, it.second, flags, j);
+            if (result.second)
+                any = true;
+        }
+        return any;
+    });
+
+    // VFALCO TODO recreate the CanonicalTxSet object instead of resetting
+    // it.
     // VFALCO NOTE The hash for an open ledger is undefined so we use
     // something that is a reasonable substitute.
     mHeldTransactions.reset(app_.openLedger().current()->info().parentHash);

src/ripple/app/main/Application.cpp

@@ -1533,7 +1533,6 @@ ApplicationImp::start(bool withTimers)
     {
         setSweepTimer();
         setEntropyTimer();
-        m_networkOPs->setBatchApplyTimer();
     }
 
     m_io_latency_sampler.start();