wl2077 - scan optimizations

(recommit in clean clone)


ndb/src/kernel/blocks/dbdih/Dbdih.hpp:
  removed unused variable
ndb/src/kernel/blocks/dbdih/DbdihMain.cpp:
  Always give all nodes in DIGETPRIMREQ
ndb/src/kernel/blocks/dbtc/DbtcMain.cpp:
  Allow readcommited-scans to scan backup fragments
ndb/test/ndbapi/testReadPerf.cpp:
  better printous

ndb/docs/wl2077.txt

+
+100' * (select 1 from T1 (1M rows) where key = rand());
+1 host, 1 ndbd, api co-hosted
+results in 1000 rows / sec
+
+		       wo/reset bounds  w/ rb
+4.1-read committed     a) 4.9		b) 7.4
+4.1-read hold lock     c) 4.7		d) 6.7
+
+wl2077-read committed  6.4 (+30%)	10.8 (+45%)
+wl2077-read hold lock  4.6 (-1%)	6.7 (+ 0%)
+
+-- Comparision e)
+serial pk:	       10.9'
+batched (1000):	       59'
+serial uniq index:     8.4'
+batched (1000):	       33'
+index range (1000):    186'
+
+----
+
+load) testScanPerf -c 1 -d 1 T1
+a) testScanPerf -s 100000 -c 0 -d 0 -a 1 -l 0 -r 2 -q 0 T1
+b) testScanPerf -s 100000 -c 0 -d 0 -a 1 -l 0 -r 2 -q 1 T1
+c) testScanPerf -s 100000 -c 0 -d 0 -a 1 -l 1 -r 2 -q 0 T1
+d) testScanPerf -s 100000 -c 0 -d 0 -a 1 -l 1 -r 2 -q 1 T1
+e) testReadPerf -i 25 -c 0 -d 0 T1
+
+--- music join		1db-co		2db-co
+			
+4.1			13s		14s
+4.1 wo/ blobs		1.7s		3.2s
+
+wl2077			12s		14s
+wl2077 wo/ blobs	1.2s (-30%)	2.5s (-22%)

ndb/src/kernel/blocks/dbdih/Dbdih.hpp

@@ -147,7 +147,6 @@ public:
     Uint32 nfConnect;
     Uint32 table;
     Uint32 userpointer;
-    Uint32 nodeCount;
     BlockReference userblockref;
   };
   typedef Ptr<ConnectRecord> ConnectRecordPtr;

ndb/src/kernel/blocks/dbdih/DbdihMain.cpp

@@ -7080,24 +7080,22 @@ void Dbdih::execDIGETPRIMREQ(Signal* signal)
   
   ndbrequire(tabPtr.p->tabStatus == TabRecord::TS_ACTIVE);
   connectPtr.i = signal->theData[0];
-  if(connectPtr.i != RNIL){
+  if(connectPtr.i != RNIL)
+  {
     jam();
     ptrCheckGuard(connectPtr, cconnectFileSize, connectRecord);
-    ndbrequire(connectPtr.p->connectState == ConnectRecord::INUSE);
-    getFragstore(tabPtr.p, fragId, fragPtr);
-    connectPtr.p->nodeCount = extractNodeInfo(fragPtr.p, connectPtr.p->nodes);
     signal->theData[0] = connectPtr.p->userpointer;
-    signal->theData[1] = passThrough;
-    signal->theData[2] = connectPtr.p->nodes[0];
-    sendSignal(connectPtr.p->userblockref, GSN_DIGETPRIMCONF, signal, 3, JBB);
-    return;
-  }//if
-  //connectPtr.i == RNIL -> question without connect record
+  }
+  else
+  {
+    jam();
+    signal->theData[0] = RNIL;
+  }
+  
   Uint32 nodes[MAX_REPLICAS];
   getFragstore(tabPtr.p, fragId, fragPtr);
   Uint32 count = extractNodeInfo(fragPtr.p, nodes);
   
-  signal->theData[0] = RNIL;
   signal->theData[1] = passThrough;
   signal->theData[2] = nodes[0];
   signal->theData[3] = nodes[1];

ndb/src/kernel/blocks/dbtc/DbtcMain.cpp

@@ -8944,6 +8944,20 @@ void Dbtc::execDIGETPRIMCONF(Signal* signal)
   scanptr.i = scanFragptr.p->scanRec;
   ptrCheckGuard(scanptr, cscanrecFileSize, scanRecord);
 
+  if(ScanFragReq::getReadCommittedFlag(scanptr.p->scanRequestInfo))
+  {
+    jam();
+    Uint32 max = 3+signal->theData[6];
+    Uint32 nodeid = getOwnNodeId();
+    for(Uint32 i = 3; i<max; i++)
+      if(signal->theData[i] ==  nodeid)
+      {
+	jam();
+	tnodeid = nodeid;
+	break;
+      }
+  }
+  
   {
     /**
      * Check table

ndb/test/ndbapi/testReadPerf.cpp

@@ -390,8 +390,15 @@ run_read(){
 
 void
 print_result(){
+  int tmp = 1;
+  tmp *= g_paramters[P_RANGE].value;
+  tmp *= g_paramters[P_LOOPS].value;
+
+  int t, t2;
   for(int i = 0; i<P_OP_TYPES; i++){
-    g_err.println("%s avg: %u us/row", g_ops[i],
-		  (1000*g_times[i])/(g_paramters[P_RANGE].value*g_paramters[P_LOOPS].value));
+    g_err << g_ops[i] << " avg: "
+	  << (int)((1000*g_times[i])/tmp)
+	  << " us/row (" 
+	  << (1000 * tmp)/g_times[i] << " rows / sec)" << endl;
   }
 }