Bug #18595 repeated create, insert, drop can cause MySQL table definition cache to

corrupt
  - add infinite retry on drop table temporary error

sql/ha_ndbcluster.cc

@@ -4036,20 +4036,30 @@ int ha_ndbcluster::delete_table(const char *name)
 
 int ha_ndbcluster::drop_table()
 {
+  THD *thd= current_thd;
   Ndb *ndb= get_ndb();
   NdbDictionary::Dictionary *dict= ndb->getDictionary();
   
   DBUG_ENTER("drop_table");
   DBUG_PRINT("enter", ("Deleting %s", m_tabname));
   
-  if (dict->dropTable(m_tabname)) 
+  while (dict->dropTable(m_tabname)) 
   {
     const NdbError err= dict->getNdbError();
-    if (err.code == 709)
-      ; // 709: No such table existed
-    else 
+    switch (err.status)
+    {
+      case NdbError::TemporaryError:
+        if (!thd->killed)
+          continue; // retry indefinitly
+        break;
+      default:
+        break;
+    }
+    if (err.code != 709) // 709: No such table existed
       ERR_RETURN(dict->getNdbError());
+    break;
   }
+
   release_metadata();
   DBUG_RETURN(0);
 }
@@ -4453,14 +4463,24 @@ int ndbcluster_drop_database(const char *path)
   List_iterator_fast<char> it(drop_list);
   while ((tabname=it++))
   {
-    if (dict->dropTable(tabname))
+    while (dict->dropTable(tabname))
     {
       const NdbError err= dict->getNdbError();
-      if (err.code != 709)
+      switch (err.status)
+      {
+        case NdbError::TemporaryError:
+          if (!thd->killed)
+            continue; // retry indefinitly
+          break;
+        default:
+          break;
+      }
+      if (err.code != 709) // 709: No such table existed
       {
         ERR_PRINT(err);
         ret= ndb_to_mysql_error(&err);
       }
+      break;
     }
   }
   DBUG_RETURN(ret);