Bug #18395 dual mysqld's with binlog do not sync drop table binlog event correctly

- in ndb_binlog_thread_handle_schema_event make sure to postpone "slock achnowledgement" until event has been put into the binlog

+ some cleanup, Cluster_replication_schem -> Cluster_schema, indentation

sql/ha_ndbcluster_binlog.cc

@@ -804,7 +804,7 @@ void ndbcluster_setup_binlog_table_shares(THD *thd)
 #define SCHEMA_SLOCK_SIZE 32u
 #define SCHEMA_QUERY_SIZE 4096u
 
-struct Cluster_replication_schema
+struct Cluster_schema
 {
   unsigned char db_length;
   char db[64];
@@ -825,7 +825,7 @@ struct Cluster_replication_schema
   Transfer schema table data into corresponding struct
 */
 static void ndbcluster_get_schema(TABLE *table,
-                                  Cluster_replication_schema *s)
+                                  Cluster_schema *s)
 {
   Field **field;
   /* db varchar 1 length byte */
@@ -1153,7 +1153,8 @@ int ndbcluster_log_schema_op(THD *thd, NDB_SHARE *share,
       /* remove any unsubscribed from share->slock */
       bitmap_intersect(&share->slock_bitmap, &schema_subscribers);
 
-      DBUG_DUMP("share->slock_bitmap.bitmap", (char*)share->slock_bitmap.bitmap,
+      DBUG_DUMP("share->slock_bitmap.bitmap",
+                (char*)share->slock_bitmap.bitmap,
                 no_bytes_in_map(&share->slock_bitmap));
 
       if (bitmap_is_clear_all(&share->slock_bitmap))
@@ -1484,9 +1485,9 @@ ndb_handle_schema_change(THD *thd, Ndb *ndb, NdbEventOperation *pOp,
 static int
 ndb_binlog_thread_handle_schema_event(THD *thd, Ndb *ndb,
                                       NdbEventOperation *pOp,
-                                      List<Cluster_replication_schema> 
+                                      List<Cluster_schema> 
                                       *post_epoch_log_list,
-                                      List<Cluster_replication_schema> 
+                                      List<Cluster_schema> 
                                       *post_epoch_unlock_list,
                                       MEM_ROOT *mem_root)
 {
@@ -1497,48 +1498,51 @@ ndb_binlog_thread_handle_schema_event(THD *thd, Ndb *ndb,
     NDBEVENT::TableEvent ev_type= pOp->getEventType();
     DBUG_PRINT("enter", ("%s.%s  ev_type: %d",
                          share->db, share->table_name, ev_type));
-    switch (ev_type)
-    {
-    case NDBEVENT::TE_UPDATE:
-      /* fall through */
-    case NDBEVENT::TE_INSERT:
+    if (ev_type == NDBEVENT::TE_UPDATE ||
+        ev_type == NDBEVENT::TE_INSERT)
     {
-      Cluster_replication_schema *schema= (Cluster_replication_schema *)
-        sql_alloc(sizeof(Cluster_replication_schema));
+      Cluster_schema *schema= (Cluster_schema *)
+        sql_alloc(sizeof(Cluster_schema));
       MY_BITMAP slock;
       bitmap_init(&slock, schema->slock, 8*SCHEMA_SLOCK_SIZE, false);
       uint node_id= g_ndb_cluster_connection->node_id();
       ndbcluster_get_schema(share->table, schema);
       if (schema->node_id != node_id)
       {
-        int log_query= 0;
+        int log_query= 0, post_epoch_unlock= 0;
         DBUG_PRINT("info", ("log query_length: %d  query: '%s'",
                             schema->query_length, schema->query));
         char key[FN_REFLEN];
         build_table_filename(key, sizeof(key), schema->db, schema->name, "");
         NDB_SHARE *share= get_share(key, 0, false, false);
-
         switch ((enum SCHEMA_OP_TYPE)schema->type)
         {
         case SOT_DROP_TABLE:
           /* binlog dropping table after any table operations */
           if (share && share->op)
+          {
             post_epoch_log_list->push_back(schema, mem_root);
+            /* acknowledge this query _after_ epoch completion */
+            post_epoch_unlock= 1;
+          }
+          /* table is either ignored or logging is postponed to later */
           log_query= 0;
           break;
         case SOT_RENAME_TABLE:
           if (share && share->op)
           {
-            log_query= 0;
             post_epoch_log_list->push_back(schema, mem_root);
+            /* acknowledge this query _after_ epoch completion */
+            post_epoch_unlock= 1;
             break; /* discovery will be handled by binlog */
           }
           goto sot_create_table;
         case SOT_ALTER_TABLE:
           if (share && share->op)
           {
-            log_query= 0;
             post_epoch_log_list->push_back(schema, mem_root);
+            /* acknowledge this query _after_ epoch completion */
+            post_epoch_unlock= 1;
             break; /* discovery will be handled by binlog */
           }
           goto sot_create_table;
@@ -1571,8 +1575,11 @@ ndb_binlog_thread_handle_schema_event(THD *thd, Ndb *ndb,
                     TRUE);   /* don't binlog the query */
           /* binlog dropping database after any table operations */
           if (ndb_binlog_running)
+          {
             post_epoch_log_list->push_back(schema, mem_root);
-          log_query= 0;
+            /* acknowledge this query _after_ epoch completion */
+            post_epoch_unlock= 1;
+          }
           break;
         case SOT_CREATE_DB:
           /* fall through */
@@ -1581,7 +1588,6 @@ ndb_binlog_thread_handle_schema_event(THD *thd, Ndb *ndb,
                     schema->query + schema->query_length,
                     TRUE,    /* print error */
                     FALSE);  /* binlog the query */
-          log_query= 0;
           break;
         case SOT_CLEAR_SLOCK:
         {
@@ -1609,25 +1615,6 @@ ndb_binlog_thread_handle_schema_event(THD *thd, Ndb *ndb,
           free_share(&share);
           share= 0;
         }
-        /* signal that schema operation has been handled */
-        if ((enum SCHEMA_OP_TYPE)schema->type != SOT_CLEAR_SLOCK)
-        {
-          DBUG_DUMP("slock", (char*)schema->slock, schema->slock_length);
-          if (bitmap_is_set(&slock, node_id))
-          {
-            /*
-              If it is an SOT_ALTER_TABLE we need to acknowledge the
-              schema operation _after_ all the events have been
-              processed so that all schema events coming through
-              the event operation has been processed
-            */
-            if ((enum SCHEMA_OP_TYPE)schema->type == SOT_ALTER_TABLE)
-              post_epoch_unlock_list->push_back(schema, mem_root);
-            else
-              ndbcluster_update_slock(thd, schema->db, schema->name);
-          }
-        }
-
         if (log_query && ndb_binlog_running)
         {
           char *thd_db_save= thd->db;
@@ -1637,9 +1624,23 @@ ndb_binlog_thread_handle_schema_event(THD *thd, Ndb *ndb,
                             schema->name[0] == 0 || thd->db[0] == 0);
           thd->db= thd_db_save;
         }
+        /* signal that schema operation has been handled */
+        DBUG_DUMP("slock", (char*)schema->slock, schema->slock_length);
+        if (bitmap_is_set(&slock, node_id))
+        {
+          if (post_epoch_unlock)
+            post_epoch_unlock_list->push_back(schema, mem_root);
+          else
+            ndbcluster_update_slock(thd, schema->db, schema->name);
         }
       }
-    break;
+      DBUG_RETURN(0);
+    }
+    /*
+      the normal case of UPDATE/INSERT has already been handled
+    */
+    switch (ev_type)
+    {
     case NDBEVENT::TE_DELETE:
       // skip
       break;
@@ -1726,13 +1727,13 @@ ndb_binlog_thread_handle_schema_event(THD *thd, Ndb *ndb,
 */
 static void
 ndb_binlog_thread_handle_schema_event_post_epoch(THD *thd,
-                                                 List<Cluster_replication_schema>
+                                                 List<Cluster_schema>
                                                  *post_epoch_log_list,
-                                                 List<Cluster_replication_schema>
+                                                 List<Cluster_schema>
                                                  *post_epoch_unlock_list)
 {
   DBUG_ENTER("ndb_binlog_thread_handle_schema_event_post_epoch");
-  Cluster_replication_schema *schema;
+  Cluster_schema *schema;
   while ((schema= post_epoch_log_list->pop()))
   {
     DBUG_PRINT("info", ("log query_length: %d  query: '%s'",
@@ -2120,7 +2121,8 @@ ndbcluster_create_event(Ndb *ndb, const NDBTAB *ndbtab,
   }
   if (share->flags & NSF_NO_BINLOG)
   {
-    DBUG_PRINT("info", ("share->flags & NSF_NO_BINLOG, flags: %x %d", share->flags, share->flags & NSF_NO_BINLOG));
+    DBUG_PRINT("info", ("share->flags & NSF_NO_BINLOG, flags: %x %d",
+                        share->flags, share->flags & NSF_NO_BINLOG));
     DBUG_RETURN(0);
   }
 
@@ -2137,7 +2139,8 @@ ndbcluster_create_event(Ndb *ndb, const NDBTAB *ndbtab,
                       share->key);
       if (push_warning)
         push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_ERROR,
-                            ER_ILLEGAL_HA_CREATE_OPTION, ER(ER_ILLEGAL_HA_CREATE_OPTION),
+                            ER_ILLEGAL_HA_CREATE_OPTION,
+                            ER(ER_ILLEGAL_HA_CREATE_OPTION),
                             ndbcluster_hton.name,
                             "Binlog of table with BLOB attribute and no PK");
         
@@ -2268,7 +2271,8 @@ ndbcluster_create_event_ops(NDB_SHARE *share, const NDBTAB *ndbtab,
 
   if (share->flags & NSF_NO_BINLOG)
   {
-    DBUG_PRINT("info", ("share->flags & NSF_NO_BINLOG, flags: %x", share->flags));
+    DBUG_PRINT("info", ("share->flags & NSF_NO_BINLOG, flags: %x",
+                        share->flags));
     DBUG_RETURN(0);
   }
 
@@ -2690,7 +2694,8 @@ ndb_binlog_thread_handle_data_event(Ndb *ndb, NdbEventOperation *pOp,
   {
   case NDBEVENT::TE_INSERT:
     row.n_inserts++;
-    DBUG_PRINT("info", ("INSERT INTO %s.%s", table_s->db.str, table_s->table_name.str));
+    DBUG_PRINT("info", ("INSERT INTO %s.%s",
+                        table_s->db.str, table_s->table_name.str));
     {
       if (share->flags & NSF_BLOB_FLAG)
       {
@@ -2701,14 +2706,16 @@ ndb_binlog_thread_handle_data_event(Ndb *ndb, NdbEventOperation *pOp,
         DBUG_ASSERT(ret == 0);
       }
       ndb_unpack_record(table, share->ndb_value[0], &b, table->record[0]);
-      int ret= trans.write_row(::server_id, injector::transaction::table(table, true),
+      int ret= trans.write_row(::server_id,
+                               injector::transaction::table(table, true),
                                &b, n_fields, table->record[0]);
       DBUG_ASSERT(ret == 0);
     }
     break;
   case NDBEVENT::TE_DELETE:
     row.n_deletes++;
-    DBUG_PRINT("info",("DELETE FROM %s.%s", table_s->db.str, table_s->table_name.str));
+    DBUG_PRINT("info",("DELETE FROM %s.%s",
+                       table_s->db.str, table_s->table_name.str));
     {
       /*
         table->record[0] contains only the primary key in this case
@@ -2737,14 +2744,16 @@ ndb_binlog_thread_handle_data_event(Ndb *ndb, NdbEventOperation *pOp,
       }
       ndb_unpack_record(table, share->ndb_value[n], &b, table->record[n]);
       DBUG_EXECUTE("info", print_records(table, table->record[n]););
-      int ret= trans.delete_row(::server_id, injector::transaction::table(table, true),
+      int ret= trans.delete_row(::server_id,
+                                injector::transaction::table(table, true),
                                 &b, n_fields, table->record[n]);
       DBUG_ASSERT(ret == 0);
     }
     break;
   case NDBEVENT::TE_UPDATE:
     row.n_updates++;
-    DBUG_PRINT("info", ("UPDATE %s.%s", table_s->db.str, table_s->table_name.str));
+    DBUG_PRINT("info", ("UPDATE %s.%s",
+                        table_s->db.str, table_s->table_name.str));
     {
       if (share->flags & NSF_BLOB_FLAG)
       {
@@ -3025,15 +3034,16 @@ pthread_handler_t ndb_binlog_thread_func(void *arg)
     MEM_ROOT *old_root= *root_ptr;
     MEM_ROOT mem_root;
     init_sql_alloc(&mem_root, 4096, 0);
-    List<Cluster_replication_schema> post_epoch_log_list;
-    List<Cluster_replication_schema> post_epoch_unlock_list;
+    List<Cluster_schema> post_epoch_log_list;
+    List<Cluster_schema> post_epoch_unlock_list;
     *root_ptr= &mem_root;
 
     if (unlikely(schema_res > 0))
     {
       schema_ndb->
         setReportThreshEventGCISlip(ndb_report_thresh_binlog_epoch_slip);
-      schema_ndb->setReportThreshEventFreeMem(ndb_report_thresh_binlog_mem_usage);
+      schema_ndb->
+        setReportThreshEventFreeMem(ndb_report_thresh_binlog_mem_usage);
       NdbEventOperation *pOp= schema_ndb->nextEvent();
       while (pOp != NULL)
       {