skip updates with the same server id as self

 kill zombie COM_BINLOG_DUMP with the same server id on connect


sql/mysql_priv.h:
  made kill_one_thread global scope
sql/slave.cc:
  skip updates with the same server id as self
  fixed compiler warning
sql/sql_parse.cc:
  COM_BINLOG_DUMP is followed by a simulation of COM_QUIT for proper thread clean up
sql/sql_repl.cc:
  kill zombie COM_BINLOG_DUMP with the same server id on connect,
  more verbose binlog_send process status

sql/mysql_priv.h

@@ -41,6 +41,7 @@ char *sql_strdup(const char *str);
 char *sql_strmake(const char *str,uint len);
 gptr sql_memdup(const void * ptr,unsigned size);
 void sql_element_free(void *ptr);
+void kill_one_thread(THD *thd, ulong id);
 
 #define x_free(A)	{ my_free((gptr) (A),MYF(MY_WME | MY_FAE | MY_ALLOW_ZERO_PTR)); }
 #define safeFree(x)	{ if(x) { my_free((gptr) x,MYF(0)); x = NULL; } }

sql/slave.cc

@@ -38,6 +38,7 @@ MASTER_INFO glob_mi;
 
 extern bool opt_log_slave_updates ;
 
+static inline void skip_load_data_infile(NET* net);
 static inline bool slave_killed(THD* thd);
 static int init_slave_thread(THD* thd);
 int init_master_info(MASTER_INFO* mi);
@@ -53,6 +54,15 @@ static inline bool slave_killed(THD* thd)
   return abort_slave || abort_loop || thd->killed;
 }
 
+static inline void skip_load_data_infile(NET* net)
+{
+  (void)my_net_write(net, "\xfb/dev/null", 10);
+  (void)net_flush(net);
+  (void)my_net_read(net); // discard response
+  send_ok(net); // the master expects it
+}
+
+
 int db_ok(const char* db, I_List<i_string> &do_list,
 	  I_List<i_string> &ignore_list )
 {
@@ -553,9 +563,26 @@ static int exec_event(THD* thd, NET* net, MASTER_INFO* mi, int event_len)
 {
   Log_event * ev = Log_event::read_log_event((const char*)net->read_pos + 1,
 					     event_len);
+  
   if (ev)
   {
-    switch(ev->get_type_code())
+    int type_code = ev->get_type_code();
+    if(ev->server_id == ::server_id)
+      {
+	if(type_code == LOAD_EVENT)
+	  skip_load_data_infile(net);
+	
+	mi->inc_pos(event_len);
+	flush_master_info(mi);
+	delete ev;     
+	return 0; // avoid infinite update loops
+      }
+  
+    thd->server_id = ev->server_id; // use the original server id for logging
+    thd->set_time(); // time the query
+    ev->when = time(NULL);
+    
+    switch(type_code)
     {
     case QUERY_EVENT:
     {
@@ -706,10 +733,7 @@ static int exec_event(THD* thd, NET* net, MASTER_INFO* mi, int event_len)
       else // we will just ask the master to send us /dev/null if we do not want to
 	// load the data :-)
       {
-	(void)my_net_write(net, "\xfb/dev/null", 10);
-	(void)net_flush(net);
-	(void)my_net_read(net); // discard response
-	send_ok(net); // the master expects it
+	skip_load_data_infile(net);
       }
 	    
       thd->net.vio = 0; 
@@ -799,14 +823,14 @@ pthread_handler_decl(handle_slave,arg __attribute__((unused)))
   if(!server_id)
     {
      sql_print_error("Server id not set, will not start slave");
-     pthread_exit(1);
+     pthread_exit((void*)1);
     }
   
   pthread_mutex_lock(&LOCK_slave);
   if(slave_running)
     {
       pthread_mutex_unlock(&LOCK_slave);
-      pthread_exit(1);  // safety just in case
+      pthread_exit((void*)1);  // safety just in case
     }
   slave_running = 1;
   abort_slave = 0;

sql/sql_parse.cc

@@ -39,7 +39,6 @@ static bool check_dup(THD *thd,const char *db,const char *name,
 		      TABLE_LIST *tables);
 static void mysql_init_query(THD *thd);
 static void remove_escape(char *name);
-static void kill_one_thread(THD *thd, ulong thread);
 static void refresh_status(void);
 
 const char *any_db="*any*";	// Special symbol for check_access
@@ -712,6 +711,9 @@ bool do_command(THD *thd)
       thd->server_id = slave_server_id;
       pthread_mutex_unlock(&LOCK_server_id);
       mysql_binlog_send(thd, strdup(packet + 11), pos, flags);
+      // fake COM_QUIT -- if we get here, the thread needs to terminate
+      error = TRUE;
+      net->error = 0;
       break;
     }
   case COM_REFRESH:
@@ -2451,7 +2453,7 @@ bool reload_acl_and_cache(THD *thd, uint options, TABLE_LIST *tables)
 }
 
 
-static void kill_one_thread(THD *thd, ulong id)
+void kill_one_thread(THD *thd, ulong id)
 {
   VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
   I_List_iterator<THD> it(threads);

sql/sql_repl.cc

@@ -225,6 +225,7 @@ void mysql_binlog_send(THD* thd, char* log_ident, ulong pos, ushort flags)
 
 	    if(read_packet)
 	    {
+	      thd->proc_info = "sending update to slave";
 	      if(my_net_write(net, (char*)packet->ptr(), packet->length()) )
 	      {
 		errmsg = "Failed on my_net_write()";
@@ -257,7 +258,7 @@ void mysql_binlog_send(THD* thd, char* log_ident, ulong pos, ushort flags)
       else
 	{
 	  bool loop_breaker = 0; // need this to break out of the for loop from switch
-
+          thd->proc_info = "switching to next log";
 	  switch(mysql_bin_log.find_next_log(&linfo))
 	    {
 	    case LOG_INFO_EOF:
@@ -309,8 +310,10 @@ void mysql_binlog_send(THD* thd, char* log_ident, ulong pos, ushort flags)
   (void)my_fclose(log, MYF(MY_WME));
   
   send_eof(&thd->net);
+  thd->proc_info = "waiting to finalize termination";
   DBUG_VOID_RETURN;
  err:
+  thd->proc_info = "waiting to finalize termination";
   if(log)
    (void) my_fclose(log, MYF(MY_WME));
   send_error(&thd->net, 0, errmsg);
@@ -408,6 +411,34 @@ void reset_slave()
 void kill_zombie_dump_threads(uint32 slave_server_id)
 {
   pthread_mutex_lock(&LOCK_thread_count);
+  I_List_iterator<THD> it(threads);
+  THD *tmp;
+
+  while((tmp=it++))
+    {
+      if(tmp->command == COM_BINLOG_DUMP &&
+	 tmp->server_id == slave_server_id)
+	{
+	  // here we do not call kill_one_thread()
+	  // it will be slow because it will iterate through the list
+	  // again. Plus it double-locks LOCK_thread_count, which
+	  // make safe_mutex complain and abort
+	  // so we just to our own thread murder
+	  
+	  thr_alarm_kill(tmp->real_id);
+	  tmp->killed = 1;
+	  pthread_mutex_lock(&tmp->mysys_var->mutex);
+          tmp->mysys_var->abort = 1;
+	  if(tmp->mysys_var->current_mutex)
+	    {
+	      pthread_mutex_lock(tmp->mysys_var->current_mutex);
+	      pthread_cond_broadcast(tmp->mysys_var->current_cond);
+	      pthread_mutex_unlock(tmp->mysys_var->current_mutex);
+	    }
+	  pthread_mutex_unlock(&tmp->mysys_var->mutex);
+	}
+   }
+  
   pthread_mutex_unlock(&LOCK_thread_count);
 }