Bug #25275 SINGLE USER MODE prevents ALTER on non-ndb tables for other mysqld nodes
- correction of part 1
    add ndb_waiter option to wait for single user mode

ndb/src/kernel/blocks/dbdict/Dbdict.cpp

@@ -2910,9 +2910,7 @@ Dbdict::execCREATE_TABLE_REQ(Signal* signal){
       break;
     }
 
-    if(getNodeState().getSingleUserMode() &&
-       (refToNode(signal->getSendersBlockRef()) !=
-        getNodeState().getSingleUserApi()))
+    if (checkSingleUserMode(signal->getSendersBlockRef()))
     {
       jam();
       parseRecord.errorCode = CreateTableRef::SingleUser;
@@ -3081,9 +3079,7 @@ Dbdict::execALTER_TABLE_REQ(Signal* signal)
     return;
   }
   
-  if(getNodeState().getSingleUserMode() &&
-     (refToNode(signal->getSendersBlockRef()) !=
-      getNodeState().getSingleUserApi()))
+  if (checkSingleUserMode(signal->getSendersBlockRef()))
   {
     jam();
     alterTableRef(signal, req, AlterTableRef::SingleUser);
@@ -5419,9 +5415,7 @@ Dbdict::execDROP_TABLE_REQ(Signal* signal){
     return;
   }
   
-  if(getNodeState().getSingleUserMode() &&
-     (refToNode(signal->getSendersBlockRef()) !=
-      getNodeState().getSingleUserApi()))
+  if (checkSingleUserMode(signal->getSendersBlockRef()))
   {
     jam();
     dropTableRef(signal, req, DropTableRef::SingleUser);
@@ -6558,9 +6552,7 @@ Dbdict::execCREATE_INDX_REQ(Signal* signal)
         jam();
         tmperr = CreateIndxRef::Busy;
       }
-      else if(getNodeState().getSingleUserMode() &&
-              (refToNode(senderRef) !=
-               getNodeState().getSingleUserApi()))
+      else if (checkSingleUserMode(senderRef))
       {
         jam();
         tmperr = CreateIndxRef::SingleUser;
@@ -7135,9 +7127,7 @@ Dbdict::execDROP_INDX_REQ(Signal* signal)
         jam();
         tmperr = DropIndxRef::Busy;
       }
-      else if(getNodeState().getSingleUserMode() &&
-              (refToNode(senderRef) !=
-               getNodeState().getSingleUserApi()))
+      else if (checkSingleUserMode(senderRef))
       {
         jam();
         tmperr = DropIndxRef::SingleUser;
@@ -10579,4 +10569,20 @@ Dbdict::getMetaAttribute(MetaData::Attribute& attr, const MetaData::Table& table
   return 0;
 }
 
+/*
+  return 1 if all of the below is true
+  a) node in single user mode
+  b) senderRef is not a db node
+  c) senderRef nodeid is not the singleUserApi
+*/
+
+int Dbdict::checkSingleUserMode(Uint32 senderRef)
+{
+  Uint32 nodeId = refToNode(senderRef);
+  return
+    getNodeState().getSingleUserMode() &&
+    (getNodeInfo(nodeId).m_type != NodeInfo::DB) &&
+    (nodeId != getNodeState().getSingleUserApi());
+}
+
 CArray<KeyDescriptor> g_key_descriptor_pool;

ndb/src/kernel/blocks/dbdict/Dbdict.hpp

@@ -1997,6 +1997,8 @@ private:
   int getMetaTable(MetaData::Table& table, const char* tableName);
   int getMetaAttribute(MetaData::Attribute& attribute, const MetaData::Table& table, Uint32 attributeId);
   int getMetaAttribute(MetaData::Attribute& attribute, const MetaData::Table& table, const char* attributeName);
+
+  int checkSingleUserMode(Uint32 senderRef);
 };
 
 #endif

ndb/tools/waiter.cpp

@@ -30,12 +30,14 @@ waitClusterStatus(const char* _addr, ndb_mgm_node_status _status,
 		  unsigned int _timeout);
 
 enum ndb_waiter_options {
-  OPT_WAIT_STATUS_NOT_STARTED = NDB_STD_OPTIONS_LAST
+  OPT_WAIT_STATUS_NOT_STARTED = NDB_STD_OPTIONS_LAST,
+  OPT_WAIT_STATUS_SINGLE_USER
 };
 NDB_STD_OPTS_VARS;
 
 static int _no_contact = 0;
 static int _not_started = 0;
+static int _single_user = 0;
 static int _timeout = 120;
 
 const char *load_default_groups[]= { "mysql_cluster",0 };
@@ -49,6 +51,10 @@ static struct my_option my_long_options[] =
   { "not-started", OPT_WAIT_STATUS_NOT_STARTED, "Wait for cluster not started",
     (gptr*) &_not_started, (gptr*) &_not_started, 0,
     GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0 }, 
+  { "single-user", OPT_WAIT_STATUS_SINGLE_USER,
+    "Wait for cluster to enter single user mode",
+    (gptr*) &_single_user, (gptr*) &_single_user, 0,
+    GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0 }, 
   { "timeout", 't', "Timeout to wait",
     (gptr*) &_timeout, (gptr*) &_timeout, 0,
     GET_INT, REQUIRED_ARG, 120, 0, 0, 0, 0, 0 }, 
@@ -90,6 +96,10 @@ int main(int argc, char** argv){
   {
     wait_status= NDB_MGM_NODE_STATUS_NOT_STARTED;
   }
+  else if (_single_user)
+  {
+    wait_status= NDB_MGM_NODE_STATUS_SINGLEUSER;
+  }
   else 
   {
     wait_status= NDB_MGM_NODE_STATUS_STARTED;