HPCC-32782 Remove headRegionSize option and associated code

This was not used (I hope!) and was desiged to solve an issue that was better
managed by the IBYTI delay logic.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>

roxie/ccd/ccd.hpp

@@ -295,7 +295,6 @@ extern unsigned callbackTimeout;
 extern unsigned lowTimeout;
 extern unsigned highTimeout;
 extern unsigned slaTimeout;
-extern unsigned headRegionSize;
 extern unsigned ccdMulticastPort;
 extern IPropertyTree *topology;
 extern MapStringTo<int> *preferredClusters;

roxie/ccd/ccdmain.cpp

@@ -75,7 +75,6 @@ unsigned numRequestArrayThreads = 5;
 bool blockedLocalAgent = true;
 bool acknowledgeAllRequests = true;
 unsigned packetAcknowledgeTimeout = 100;
-unsigned headRegionSize;
 unsigned ccdMulticastPort;
 bool enableHeartBeat = true;
 unsigned parallelLoopFlowLimit = 100;
@@ -1000,7 +999,6 @@ int CCD_API roxie_main(int argc, const char *argv[], const char * defaultYaml)
         minPayloadSize = topology->getPropInt("@minPayloadSize", minPayloadSize);
         blockedLocalAgent = topology->getPropBool("@blockedLocalAgent", blockedLocalAgent);
         acknowledgeAllRequests = topology->getPropBool("@acknowledgeAllRequests", acknowledgeAllRequests);
-        headRegionSize = topology->getPropInt("@headRegionSize", 0);
         packetAcknowledgeTimeout = topology->getPropInt("@packetAcknowledgeTimeout", packetAcknowledgeTimeout);
         ccdMulticastPort = topology->getPropInt("@multicastPort", CCD_MULTICAST_PORT);
         statsExpiryTime = topology->getPropInt("@statsExpiryTime", 3600);
@@ -1450,7 +1448,6 @@ int CCD_API roxie_main(int argc, const char *argv[], const char * defaultYaml)
             DBGLOG("Loading all packages took %ums", loadPackageTimer.elapsedMs());
 
         ROQ = createOutputQueueManager(numAgentThreads, encryptInTransit);
-        ROQ->setHeadRegionSize(headRegionSize);
         ROQ->start();
         Owned<IPacketDiscarder> packetDiscarder = createPacketDiscarder();
 #if defined(WIN32) && defined(_DEBUG) && defined(_DEBUG_HEAP_FULL)

roxie/ccd/ccdqueue.cpp

@@ -1151,7 +1151,6 @@ class RoxieQueue : public CInterface, implements IThreadFactory
     Semaphore available;
     CriticalSection availCrit;    // Semaphore post may be slow with a lot of waiters - this crit may be used to limit to a single waiter
     CriticalSection qcrit;
-    unsigned headRegionSize;
     unsigned numWorkers;
     RelaxedAtomic<unsigned> started;
     std::atomic<unsigned> idle;
@@ -1173,9 +1172,8 @@ class RoxieQueue : public CInterface, implements IThreadFactory
 public:
     IMPLEMENT_IINTERFACE;
 
-    RoxieQueue(unsigned _headRegionSize, unsigned _numWorkers)
+    RoxieQueue(unsigned _numWorkers)
     {
-        headRegionSize = _headRegionSize;
         numWorkers = _numWorkers;
         workers.setown(createThreadPool("RoxieWorkers", this, false, nullptr, numWorkers));
         started = 0;
@@ -1332,31 +1330,7 @@ class RoxieQueue : public CInterface, implements IThreadFactory
     ISerializedRoxieQueryPacket *dequeue()
     {
         CriticalBlock qc(qcrit);
-        unsigned lim = waiting.ordinality();
-        if (lim)
-        {
-            if (headRegionSize)
-            {
-                if (lim > headRegionSize)
-                    lim = headRegionSize;
-                return waiting.dequeue(fastRand() % lim);
-            }
-            return waiting.dequeue();
-        }
-        else
-            return NULL;
-    }
-
-    unsigned getHeadRegionSize() const
-    {
-        return headRegionSize;
-    }
-
-    unsigned setHeadRegionSize(unsigned newsize)
-    {
-        unsigned ret = headRegionSize;
-        headRegionSize = newsize;
-        return ret;
+        return waiting.dequeue();
     }
 
     void noteOrphanIBYTI(const RoxiePacketHeader &hdr)
@@ -1906,20 +1880,8 @@ class RoxieReceiverBase : implements IRoxieOutputQueueManager, public CInterface
 public:
     IMPLEMENT_IINTERFACE;
 
-    RoxieReceiverBase(unsigned _numWorkers) : slaQueue(headRegionSize, _numWorkers), hiQueue(headRegionSize, _numWorkers), loQueue(headRegionSize, _numWorkers), numWorkers(_numWorkers)
-    {
-    }
-
-    virtual unsigned getHeadRegionSize() const
-    {
-        return loQueue.getHeadRegionSize();
-    }
-
-    virtual void setHeadRegionSize(unsigned newSize)
+    RoxieReceiverBase(unsigned _numWorkers) : slaQueue(_numWorkers), hiQueue(_numWorkers), loQueue(_numWorkers), numWorkers(_numWorkers)
     {
-        slaQueue.setHeadRegionSize(newSize);
-        hiQueue.setHeadRegionSize(newSize);
-        loQueue.setHeadRegionSize(newSize);
     }
 
     virtual void start() 

roxie/udplib/udplib.hpp

@@ -177,9 +177,6 @@ interface IRoxieOutputQueueManager : public IInterface
     virtual bool replyPending(RoxiePacketHeader &x) = 0;
     virtual bool abortCompleted(RoxiePacketHeader &x) = 0;
 
-    virtual unsigned getHeadRegionSize() const = 0;
-    virtual void setHeadRegionSize(unsigned newsize) = 0;
-
     virtual void start() = 0;
     virtual void stop() = 0;
     virtual void join() = 0;