wl2240 - ndb partitioning

1) Fix startTransaction with hint
2) Ship fragment data to API to make better guess
3) Expose both primary & backup replicas 
   To (in the future) be even more clever on choosing nodes for
   transactions/operations


ndb/include/kernel/ndb_limits.h:
  Set maxsize of array with fragment data
ndb/include/kernel/signaldata/DictTabInfo.hpp:
  Send fragment data to API
ndb/src/common/debugger/signaldata/DictTabInfo.cpp:
  Send fragment data to API
ndb/src/kernel/blocks/dbdict/Dbdict.cpp:
  Send fragment data to API
ndb/src/kernel/blocks/dbdict/Dbdict.hpp:
  Send fragment data to API
ndb/src/kernel/blocks/dbdih/DbdihMain.cpp:
  Use Uint16 for fragment info
  Fix uninit variable
ndb/src/ndbapi/Ndb.cpp:
  Impl. startTransaction with hint
ndb/src/ndbapi/NdbDictionaryImpl.cpp:
  Add interface for retreiving replica nodes given a hash-value
ndb/src/ndbapi/NdbDictionaryImpl.hpp:
  Add interface for retreiving replica nodes given a hash-value
ndb/src/ndbapi/ndb_cluster_connection.cpp:
  remove Fragment2NodeMap and put it on table instead
ndb/src/ndbapi/ndb_cluster_connection_impl.hpp:
  remove Fragment2NodeMap and put it on table instead
ndb/test/ndbapi/testNdbApi.cpp:
  Test some more

1 files changed, 31 insertions, 8 deletions

diff --git a/ndb/src/ndbapi/Ndb.cpp b/ndb/src/ndbapi/Ndb.cpp
index aa3f188e885..ba878ac4336 100644
--- a/ndb/src/ndbapi/Ndb.cpp
+++ b/ndb/src/ndbapi/Ndb.cpp
@@ -307,18 +307,41 @@ Ndb::startTransaction(const NdbDictionary::Table *table,
   if (theInitState == Initialised) {
     theError.code = 0;
     checkFailedNode();
-  /**
-   * If the user supplied key data
-   * We will make a qualified quess to which node is the primary for the
-   * the fragment and contact that node
-   */
+    /**
+     * If the user supplied key data
+     * We will make a qualified quess to which node is the primary for the
+     * the fragment and contact that node
+     */
     Uint32 nodeId;
-    if(keyData != 0) {
-      nodeId = 0; // guess not supported
-      // nodeId = m_ndb_cluster_connection->guess_primary_node(keyData, keyLen);
+    NdbTableImpl* impl;
+    if(table != 0 && keyData != 0 && (impl= &NdbTableImpl::getImpl(*table))) 
+    {
+      Uint32 hashValue;
+      {
+	Uint32 buf[4];
+	if((UintPtr(keyData) & 7) == 0 && (keyLen & 3) == 0)
+	{
+	  md5_hash(buf, (const Uint64*)keyData, keyLen >> 2);
+	}
+	else
+	{
+	  Uint64 tmp[1000];
+	  tmp[keyLen/8] = 0;
+	  memcpy(tmp, keyData, keyLen);
+	  md5_hash(buf, tmp, (keyLen+3) >> 2);	  
+	}
+	hashValue= buf[1];
+      }
+      const Uint16 *nodes;
+      Uint32 cnt= impl->get_nodes(hashValue, &nodes);
+      if(cnt)
+	nodeId= nodes[0];
+      else
+	nodeId= 0;
     } else {
       nodeId = 0;
     }//if
+
     {
       NdbTransaction *trans= startTransactionLocal(0, nodeId);
       DBUG_PRINT("exit",("start trans: 0x%x transid: 0x%llx",