Fix for Bug #20395 Cluster datanodes always assigned to nodegroup 0 during single user mode.

Data node is not allowed to get added in the cluster when it is in single user mode.

ndb/include/kernel/signaldata/CmRegSignalData.hpp

@@ -90,7 +90,11 @@ public:
     ZNOT_PRESIDENT = 5, /* We are not president */
     ZNOT_DEAD = 6,       /* We are not dead when we are starting  */
     ZINCOMPATIBLE_VERSION = 7,
-    ZINCOMPATIBLE_START_TYPE = 8
+    ZINCOMPATIBLE_START_TYPE = 8,
+    ZSINGLE_USER_MODE = 9, /* The cluster is in single user mode,
+			    * data node is not allowed to get added
+			    * in the cluster while in single user mode */
+    ZGENERIC = 100 /* The generic error code */
   };
 private:
   

ndb/include/mgmapi/ndbd_exit_codes.h

@@ -65,6 +65,7 @@ typedef ndbd_exit_status_enum ndbd_exit_status;
 typedef ndbd_exit_classification_enum ndbd_exit_classification;
 
 /* Errorcodes before block division was used */
+#define NDBD_EXIT_GENERIC                     2300
 #define NDBD_EXIT_PRGERR                      2301
 #define NDBD_EXIT_NODE_NOT_IN_CONFIG          2302
 #define NDBD_EXIT_SYSTEM_ERROR                2303
@@ -78,6 +79,7 @@ typedef ndbd_exit_classification_enum ndbd_exit_classification;
 #define NDBD_EXIT_SR_RESTARTCONFLICT          2311
 #define NDBD_EXIT_NO_MORE_UNDOLOG             2312 
 #define NDBD_EXIT_SR_UNDOLOG                  2313 
+#define NDBD_EXIT_SINGLE_USER_MODE            2314 
 #define NDBD_EXIT_MEMALLOC                    2327
 #define NDBD_EXIT_BLOCK_JBUFCONGESTION        2334
 #define NDBD_EXIT_TIME_QUEUE_SHORT            2335

ndb/include/ndb_version.h.in

@@ -62,5 +62,6 @@ char ndb_version_string_buf[NDB_VERSION_STRING_BUF_SZ];
 
 #define NDBD_DICT_LOCK_VERSION_5 MAKE_VERSION(5,0,23)
 
+#define NDBD_QMGR_SINGLEUSER_VERSION_5 MAKE_VERSION(5,0,25)
 #endif
  

ndb/src/kernel/blocks/qmgr/QmgrMain.cpp

@@ -153,6 +153,7 @@ void Qmgr::execCONTINUEB(Signal* signal)
       return;
     }
     Uint64 now = NdbTick_CurrentMillisecond();
+
     if (now > (c_start_election_time + c_restartFailureTimeout))
     {
       jam();
@@ -699,6 +700,39 @@ void Qmgr::execCM_REGREQ(Signal* signal)
     return;
   } 
 
+  if (getNodeState().getSingleUserMode()) 
+  {
+    /** 
+     * The cluster is in single user mode.
+     * Data node is not allowed to get added in the cluster 
+     * while in single user mode.
+     */
+    // handle rolling upgrade
+    {
+      unsigned int get_major = getMajor(startingVersion);
+      unsigned int get_minor = getMinor(startingVersion);
+      unsigned int get_build = getBuild(startingVersion);
+
+      if (startingVersion < NDBD_QMGR_SINGLEUSER_VERSION_5) {
+        jam();
+
+        infoEvent("QMGR: detect upgrade: new node %u old version %u.%u.%u",
+          (unsigned int)addNodePtr.i, get_major, get_minor, get_build);
+        /** 
+         * The new node is old version, send ZINCOMPATIBLE_VERSION instead
+         * of ZSINGLE_USER_MODE.
+         */
+        sendCmRegrefLab(signal, Tblockref, CmRegRef::ZINCOMPATIBLE_VERSION);
+      } else {
+        jam();
+
+        sendCmRegrefLab(signal, Tblockref, CmRegRef::ZSINGLE_USER_MODE);
+      }//if
+    }
+
+    return;
+  }//if
+
   ptrCheckGuard(addNodePtr, MAX_NDB_NODES, nodeRec);
   Phase phase = addNodePtr.p->phase;
   if (phase != ZINIT)
@@ -1093,6 +1127,19 @@ void Qmgr::execCM_REGREF(Signal* signal)
     jam();
     progError(__LINE__, NDBD_EXIT_NODE_NOT_DEAD);
     break;
+  case CmRegRef::ZSINGLE_USER_MODE:
+    jam();
+    progError(__LINE__, NDBD_EXIT_SINGLE_USER_MODE);
+    break;
+  /**
+   * For generic refuse error.
+   * e.g. in online upgrade, we can use this error code instead
+   * of the incompatible error code.
+   */
+  case CmRegRef::ZGENERIC:
+    jam();
+    progError(__LINE__, NDBD_EXIT_GENERIC);
+    break;
   case CmRegRef::ZELECTION:
     jam();
     if (candidate_gci > c_start.m_president_candidate_gci ||

ndb/src/kernel/error/ndbd_exit_codes.c

@@ -45,6 +45,7 @@ typedef struct ErrStruct {
 
 static const ErrStruct errArray[] =
 {
+   {NDBD_EXIT_GENERIC, XRE, "Generic error"},
    {NDBD_EXIT_PRGERR, XIE, "Assertion"},
    {NDBD_EXIT_NODE_NOT_IN_CONFIG, XCE,
     "node id in the configuration has the wrong type, (i.e. not an NDB node)"},
@@ -68,6 +69,8 @@ static const ErrStruct errArray[] =
     "No more free UNDO log, increase UndoIndexBuffer"},
    {NDBD_EXIT_SR_UNDOLOG, XFI,
     "Error while reading the datapages and UNDO log"},
+   {NDBD_EXIT_SINGLE_USER_MODE, XRE, "Data node is not allowed to get added "
+    "to the cluster while it is in single user mode"},
    {NDBD_EXIT_MEMALLOC, XCE, "Memory allocation failure, "
     "please decrease some configuration parameters"},
    {NDBD_EXIT_BLOCK_JBUFCONGESTION, XIE, "Job buffer congestion"},