Fix for avoiding gettin Invalid schema object version when doing local changes

mysql-test/r/ndb_multi.result

@@ -13,6 +13,26 @@ a
 show status like 'handler_discover%';
 Variable_name	Value
 Handler_discover	0
+select * from t1;
+a
+2
+drop table t1;
+create table t1 (a int) engine=ndbcluster;
+insert into t1 value (2);
+select * from t1;
+a
+2
+show status like 'handler_discover%';
+Variable_name	Value
+Handler_discover	0
+drop table t1;
+create table t1 (a int) engine=ndbcluster;
+insert into t1 value (2);
+select * from t1;
+ERROR HY000: Got error 241 'Invalid schema object version' from ndbcluster
+select * from t1;
+a
+2
 flush status;
 select * from t1;
 a
@@ -20,7 +40,7 @@ a
 update t1 set a=3 where a=2;
 show status like 'handler_discover%';
 Variable_name	Value
-Handler_discover	1
+Handler_discover	0
 create table t3 (a int not null primary key, b varchar(22),
 c int, last_col text) engine=ndb;
 insert into t3 values(1, 'Hi!', 89, 'Longtext column');

mysql-test/t/ndb_multi.test

@@ -18,6 +18,30 @@ select * from t1;
 select * from t2;
 show status like 'handler_discover%';
 
+# Check dropping and recreating table on same server
+connect (con1,localhost,,,test);
+connect (con2,localhost,,,test);
+connection con1;
+select * from t1;
+connection con2;
+drop table t1;
+create table t1 (a int) engine=ndbcluster;
+insert into t1 value (2);
+connection con1;
+select * from t1;
+
+# Check dropping and recreating table on different server
+connection server2;
+show status like 'handler_discover%';
+drop table t1;
+create table t1 (a int) engine=ndbcluster;
+insert into t1 value (2);
+connection server1;
+# Currently a retry is required remotely
+--error 1296
+select * from t1;
+select * from t1;
+
 # Connect to server2 and use the tables from there
 connection server2;
 flush status;

ndb/include/ndbapi/NdbDictionary.hpp

@@ -75,8 +75,11 @@ public:
       Changed,                ///< The object has been modified in memory 
                               ///< and has to be commited in NDB Kernel for 
                               ///< changes to take effect
-      Retrieved               ///< The object exist and has been read 
+      Retrieved,              ///< The object exist and has been read 
                               ///< into main memory from NDB Kernel
+      Invalid                 ///< The object has been invalidated
+                              ///< and should not be used
+      
     };
 
     /**

ndb/src/ndbapi/NdbDictionaryImpl.cpp

@@ -1448,6 +1448,7 @@ int NdbDictionaryImpl::alterTable(NdbTableImpl &impl)
       // If in local cache it must be in global
       if (!cachedImpl)
 	abort();
+      cachedImpl->m_status = NdbDictionary::Object::Invalid;
       m_globalHash->drop(cachedImpl);
       m_globalHash->unlock();
     }
@@ -1747,8 +1748,8 @@ NdbDictionaryImpl::dropTable(const char * name)
 
     DBUG_PRINT("info",("INCOMPATIBLE_VERSION internal_name: %s", internalTableName));
     m_localHash.drop(internalTableName);
-    
     m_globalHash->lock();
+    tab->m_status = NdbDictionary::Object::Invalid;
     m_globalHash->drop(tab);
     m_globalHash->unlock();   
     DBUG_RETURN(dropTable(name));
@@ -1793,9 +1794,10 @@ NdbDictionaryImpl::dropTable(NdbTableImpl & impl)
   if(ret == 0 || m_error.code == 709){
     const char * internalTableName = impl.m_internalName.c_str();
 
-    m_localHash.drop(internalTableName);
     
+    m_localHash.drop(internalTableName);
     m_globalHash->lock();
+    impl.m_status = NdbDictionary::Object::Invalid;
     m_globalHash->drop(&impl);
     m_globalHash->unlock();
 
@@ -1889,6 +1891,7 @@ NdbDictionaryImpl::invalidateObject(NdbTableImpl & impl)
 
   m_localHash.drop(internalTableName);  
   m_globalHash->lock();
+  impl.m_status = NdbDictionary::Object::Invalid;
   m_globalHash->drop(&impl);
   m_globalHash->unlock();
   return 0;
@@ -2152,8 +2155,8 @@ NdbDictionaryImpl::dropIndex(const char * indexName,
       m_ndb.internalizeTableName(indexName); // Index is also a table
     
     m_localHash.drop(internalIndexName);
-    
     m_globalHash->lock();
+    idx->m_table->m_status = NdbDictionary::Object::Invalid;
     m_globalHash->drop(idx->m_table);
     m_globalHash->unlock();   
     return dropIndex(indexName, tableName);
@@ -2187,8 +2190,8 @@ NdbDictionaryImpl::dropIndex(NdbIndexImpl & impl, const char * tableName)
     int ret = m_receiver.dropIndex(impl, *timpl);
     if(ret == 0){
       m_localHash.drop(internalIndexName);
-      
       m_globalHash->lock();
+      impl.m_table->m_status = NdbDictionary::Object::Invalid;
       m_globalHash->drop(impl.m_table);
       m_globalHash->unlock();
     }

sql/ha_ndbcluster.cc

@@ -331,11 +331,14 @@ void ha_ndbcluster::no_uncommitted_rows_reset(THD *thd)
     #   The mapped error code
 */
 
-void ha_ndbcluster::invalidateDictionaryCache()
+void ha_ndbcluster::invalidate_dictionary_cache(bool global)
 {
   NDBDICT *dict= get_ndb()->getDictionary();
   DBUG_PRINT("info", ("invalidating %s", m_tabname));
+  if (global)
     dict->invalidateTable(m_tabname);
+  else
+    dict->removeCachedTable(m_tabname);
   table->version=0L;			/* Free when thread is ready */
   /* Invalidate indexes */
   for (uint i= 0; i < table->keys; i++)
@@ -347,12 +350,21 @@ void ha_ndbcluster::invalidateDictionaryCache()
     switch(idx_type) {
     case(PRIMARY_KEY_ORDERED_INDEX):
     case(ORDERED_INDEX):
+      if (global)
         dict->invalidateIndex(index->getName(), m_tabname);
+      else
+        dict->removeCachedIndex(index->getName(), m_tabname);
       break;      
     case(UNIQUE_ORDERED_INDEX):
+      if (global)
         dict->invalidateIndex(index->getName(), m_tabname);
+      else
+        dict->removeCachedIndex(index->getName(), m_tabname);
     case(UNIQUE_INDEX):
+      if (global)
         dict->invalidateIndex(unique_index->getName(), m_tabname);
+      else
+        dict->removeCachedIndex(unique_index->getName(), m_tabname);
       break;
     case(PRIMARY_KEY_INDEX):
     case(UNDEFINED_INDEX):
@@ -371,7 +383,7 @@ int ha_ndbcluster::ndb_err(NdbConnection *trans)
   switch (err.classification) {
   case NdbError::SchemaError:
   {
-    invalidateDictionaryCache();
+    invalidate_dictionary_cache(TRUE);
 
     if (err.code==284)
     {
@@ -765,9 +777,15 @@ int ha_ndbcluster::get_metadata(const char *path)
     const void *data, *pack_data;
     uint length, pack_length;
 
+    if (!(tab= dict->getTable(m_tabname)))
+      ERR_RETURN(dict->getNdbError());
+    if (tab->getObjectStatus() == NdbDictionary::Object::Invalid)
+    {
+      invalidate_dictionary_cache(FALSE);
       if (!(tab= dict->getTable(m_tabname)))
          ERR_RETURN(dict->getNdbError());
       DBUG_PRINT("info", ("Table schema version: %d", tab->getObjectVersion()));
+    }
     /*
       Compare FrmData in NDB with frm file from disk.
     */
@@ -786,7 +804,7 @@ int ha_ndbcluster::get_metadata(const char *path)
       if (!invalidating_ndb_table)
       {
 	DBUG_PRINT("info", ("Invalidating table"));
-        invalidateDictionaryCache();
+        invalidate_dictionary_cache(TRUE);
 	invalidating_ndb_table= TRUE;
       }
       else
@@ -812,7 +830,7 @@ int ha_ndbcluster::get_metadata(const char *path)
   if (error)
     DBUG_RETURN(error);
   
-  m_tableVersion= tab->getObjectVersion();
+  m_table_version= tab->getObjectVersion();
   m_table= (void *)tab; 
   m_table_info= NULL; // Set in external lock
   
@@ -3226,15 +3244,25 @@ int ha_ndbcluster::external_lock(THD *thd, int lock_type)
       void *tab_info;
       if (!(tab= dict->getTable(m_tabname, &tab_info)))
 	ERR_RETURN(dict->getNdbError());
-      DBUG_PRINT("info", ("Table schema version: %d", tab->getObjectVersion()));
-      if (m_table != (void *)tab || m_tableVersion != tab->getObjectVersion())
+      DBUG_PRINT("info", ("Table schema version: %d", 
+                          tab->getObjectVersion()));
+      // Check if thread has stale local cache
+      if (tab->getObjectStatus() == NdbDictionary::Object::Invalid)
+      {
+        invalidate_dictionary_cache(FALSE);
+        if (!(tab= dict->getTable(m_tabname)))
+          ERR_RETURN(dict->getNdbError());
+        DBUG_PRINT("info", ("Table schema version: %d", 
+                            tab->getObjectVersion()));
+      }
+      if (m_table != (void *)tab || m_table_version < tab->getObjectVersion())
       {
         /*
           The table has been altered, refresh the index list
         */
         build_index_list(ndb, table, ILBP_OPEN);  
         m_table= (void *)tab;
-        m_tableVersion = tab->getObjectVersion();
+        m_table_version = tab->getObjectVersion();
       }
       m_table_info= tab_info;
     }
@@ -4006,7 +4034,7 @@ ha_ndbcluster::ha_ndbcluster(TABLE *table_arg):
   m_active_trans(NULL),
   m_active_cursor(NULL),
   m_table(NULL),
-  m_tableVersion(-1),
+  m_table_version(-1),
   m_table_info(NULL),
   m_table_flags(HA_REC_NOT_IN_SEQ |
 		HA_NULL_IN_KEY |

sql/ha_ndbcluster.h

@@ -203,7 +203,7 @@ class ha_ndbcluster: public handler
   void print_results();
 
   longlong get_auto_increment();
-  void invalidateDictionaryCache();
+  void invalidate_dictionary_cache(bool global);
   int ndb_err(NdbConnection*);
   bool uses_blob_value(bool all_fields);
 
@@ -215,7 +215,7 @@ class ha_ndbcluster: public handler
   NdbConnection *m_active_trans;
   NdbResultSet *m_active_cursor;
   void *m_table;
-  int m_tableVersion;
+  int m_table_version;
   void *m_table_info;
   char m_dbname[FN_HEADLEN];
   //char m_schemaname[FN_HEADLEN];