Re: bzr commit into mysql-5.0-bugteam branch (alfranio.correia:2704) Bug#31665 Bug#35542 Bug#40337

[He Zhenxing]

alfranio correia wrote:
> Hi,
> 
> He Zhenxing wrote:
> > Hi Alfranio
> >
> > Maybe I did not make my point very clearly in my previous mail, here is
> > a summary of the things that I think you need to consider:
> >
> > 1) Only include the code of your approach in your patch, remove all the
> > code from patches for BUG#31665
> >   
> I agree with that but my patch needs to be applied right after applying
> yours.
> There is an intersection between these patches.

Although both patches may modify some code lines at the same time, but I
think that your approach does not dependent on the approach implemented
for BUG#31665, they are two different approaches for the same problem.
So I don't think your patch need to be based on the patch of BUG#31665,
I think you can base your approach directly on the original mysql-5.0
code.

Please don't hesitate to tell me if I misunderstand or miss something
here.

> See the code below.
> > 2) I think we only discard relay-log when we restart slave after a
> > crash, or we detected some error in the relay-log or master.info,
> > otherwise slave should act as normal.
> >
> > 3) the discarded relay-logs need to be purged correctly, so that there
> > will not be duplicated binlog events in the relay-log. (You already
> > commented on this, if it does, then it's OK)
> >
> > alfranio correia wrote:
> >   
> >> He Zhenxing wrote:
> >>     
> >>> Hi Alfranio
> >>>
> >>> Thank you for your work!
> >>>
> >>> Here is my thoughts about these two approaches:
> >>> 1) The first approach (BUG#35542, BUG#31665) introduces
> >>> --sync-relay-log, which fsync the relay-log and master.info for every
> >>> sync_relay_log events, and fsync the relay-log.info every
> sync_relay_log
> >>> transactions.
> >>>  
> >>> 2) The second approach (BUG#40337) introduces --relay-log-throw, which
> >>> fsync the relay-log.info for EVERY transaction, and when restart from
> >>> server crash, the slave purges any relay-logs after the executed master
> >>> log position recorded in relay-log.info and re-fetch master binlogs
> from
> >>> that position.
> >>>
> >>> I think most part of these two approaches are orthogonal, except that
> we
> >>> have to make sure when both are enabled, the relay-log.info is only
> >>> flushed once for every transaction.
> >>>   
> >>>       
> >> Jasonh, I partially agree with that.  In order to ensure that the
> >> relay-log.info is synced after every transaction
> >> I've changed some lines in your patch:
> >>
> >> yours--->
> >>
> >> @@ -4885,10 +4890,16 @@ bool flush_relay_log_info(RELAY_LOG_INFO
> >>      error=1;
> >>    if (flush_io_cache(file))
> >>      error=1;
> >> +  static unsigned int count= 1;
> >>    if (sync_relaylog_period &&
> >>        !error &&
> >> -      my_sync(rli->info_fd, MYF(MY_WME)))
> >> -    error=1;
> >> +      count > sync_relaylog_period)
> >> +  {
> >> +    if (my_sync(rli->info_fd, MYF(MY_WME)))
> >> +      error=1;
> >> +    count= 1;
> >> +  }
> >>
> >> ----------------------
> >> mine--->
> >>
> >> - if (sync_relaylog_period &&
> >> - !error &&
> >> -     count > sync_relaylog_period)
> >> +  if (sync_relaylog_period &&
> >> +      !error)
> >> ------------------------
> >>
> >> I can do something like this:
> >>
> >> if (((sync_relaylog_period && count > sync_relaylog_period) ||
> relay_log_throw)
> >>  && !error)
> >>
> >>     
> >>> So I think you do not need to base your patch on mine (actually
> >>> Sinisa's), I think your approach and the approach proposed by Sinisa
> can
> >>> be seperate. It should be possible that we only add your approach to
> the
> >>> code. So I think your approach should only depend on option
> >>> --relay-log-throw, and should not have dependency on option
> >>> --sync-relay-log.
> >>>
> >>> BTW, since the performance of previous approach is acceptable if we
> turn
> >>> on hard drive cache, and it won't delete the relay-log that's already
> >>> been saved on slave, which some users may prefer, so I think the first
> >>> approach still has its use case. So I think we can have both and the
> >>> users can choose any one of them or both of them.
> >>>
> >>> There are also some inline comments.
> >>>
> >>> Alfranio Correia wrote:
> >>>   
> >>>       
> >>>> #At
> file:///home/acorreia/workspace.sun/playground.mysql/mysql-5.0.68-custom_build/
> >>>>
> >>>>  2704 Alfranio Correia	2008-10-27
> >>>>       Merged patch that was proposed by Sinisa and modified by He
> Zhenxing to fix bugs: BUG#35542 and BUG#31665. This is an update to BUG#40337.
> >>>>       And introduced a new recovery process that disregards old
> relay-log.bin(s) and starts
> >>>>       re-fetching from the master based on the information in
> relay-log.info which may be flushed and synced after each transaction commit.
> >>>> modified:
> >>>>   mysql-test/r/rpl_flush_log_loop.result
> >>>>   sql/log.cc
> >>>>   sql/mysql_priv.h
> >>>>   sql/mysqld.cc
> >>>>   sql/set_var.cc
> >>>>   sql/set_var.h
> >>>>   sql/slave.cc
> >>>>   sql/sql_class.h
> >>>>
> >>>> per-file messages:
> >>>>   mysql-test/r/rpl_flush_log_loop.result
> >>>>     Changed result file for a test case affected by fix proposed for
> BUG#40337
> >>>>   sql/log.cc
> >>>>     Added support to the checkpoint interval through the parameter
> --sync-relay-log.
> >>>>   sql/mysql_priv.h
> >>>>     Created parameter --relay_log_throw, default = 0 thus keeping
> the original behavior. And added support to the checkpoint interval through the parameter
> --sync-relay-log, default = 0 thus keeping the original behavior.
> >>>>     
> >>>>         
> >>> Usually, we use hyphen (-) instead of underscore (_) in option names,
> >>> but the corresponding parameter name will use unserscore.
> >>>   
> >>>       
> >> I will fix this in the next commit.
> >>     
> >>>   
> >>>       
> >>>>   sql/mysqld.cc
> >>>>     Created parameter --relay_log_throw, default = 0 thus keeping
> the original behavior. And added support to the checkpoint interval through the parameter
> --sync-relay-log, default = 0 thus keeping the original behavior.
> >>>>   sql/set_var.cc
> >>>>     Created parameter --relay_log_throw, default = 0 thus keeping
> the original behavior. And added support to the checkpoint interval through the parameter
> --sync-relay-log, default = 0 thus keeping the original behavior.
> >>>>   sql/set_var.h
> >>>>     Added support to the checkpoint interval through the parameter
> --sync-relay-log.
> >>>>   sql/slave.cc
> >>>>     Introduced the function init_recovery that is fired right after
> the startup and
> >>>>     updates the master.info according to the relay-log.info and
> throws away (i.e. ignores)the old relay-log.bin. And also added support to the checkpoint
> interval through the parameter --sync-relay-log. 
> >>>>     
> >>>>     Note that the when --sync-relay-log is on the relay-info is
> flushed and synced per transaction commit: 
> >>>>     
> >>>>           if (sync_relaylog_period &&
> >>>>               !error)
> >>>>           {
> >>>>             if (my_sync(rli->info_fd, MYF(MY_WME)))
> >>>>               error=1;
> >>>>           }
> >>>>     
> >>>>     This is a bit different from the patch proposed for BUG#35542
> and BUG#31665.
> >>>>   sql/sql_class.h
> >>>>     Created sync_period that determines how often the master.info
> and relay-log.bin are flushed and synch. This parameter should be seen as a checkpoint
> based on number of events.
> >>>> === modified file 'mysql-test/r/rpl_flush_log_loop.result'
> >>>> --- a/mysql-test/r/rpl_flush_log_loop.result	2007-10-10 07:21:11
> +0000
> >>>> +++ b/mysql-test/r/rpl_flush_log_loop.result	2008-10-27 15:09:43
> +0000
> >>>> @@ -10,6 +10,7 @@ relay_log	MYSQLTEST_VARDIR/master-data/r
> >>>>  relay_log_index	
> >>>>  relay_log_info_file	relay-log.info
> >>>>  relay_log_purge	ON
> >>>> +relay_log_throw	OFF
> >>>>  relay_log_space_limit	0
> >>>>  stop slave;
> >>>>  change master to master_host='127.0.0.1',master_user='root',
> >>>>
> >>>> === modified file 'sql/log.cc'
> >>>> --- a/sql/log.cc	2008-07-24 12:28:21 +0000
> >>>> +++ b/sql/log.cc	2008-10-27 15:09:43 +0000
> >>>> @@ -32,8 +32,7 @@
> >>>>  #include "message.h"
> >>>>  #endif
> >>>>  
> >>>> -MYSQL_LOG mysql_log, mysql_slow_log, mysql_bin_log;
> >>>> -ulong sync_binlog_counter= 0;
> >>>> +MYSQL_LOG mysql_log, mysql_slow_log,
> mysql_bin_log(&sync_binlog_period);
> >>>>  
> >>>>  static Muted_query_log_event invisible_commit;
> >>>>  
> >>>> @@ -402,10 +401,11 @@ static int find_uniq_filename(char *name
> >>>>  }
> >>>>  
> >>>>
> >>>> -MYSQL_LOG::MYSQL_LOG()
> >>>> +MYSQL_LOG::MYSQL_LOG(uint *sync_period)
> >>>>    :bytes_written(0), last_time(0), query_start(0), name(0),
> >>>>     prepared_xids(0), log_type(LOG_CLOSED), file_id(1),
> open_count(1),
> >>>>     write_error(FALSE), inited(FALSE), need_start_event(TRUE),
> >>>> +   sync_period_ptr(sync_period),
> >>>>     description_event_for_exec(0), description_event_for_queue(0)
> >>>>  {
> >>>>    /*
> >>>> @@ -1622,6 +1622,8 @@ bool MYSQL_LOG::append(Log_event* ev)
> >>>>    }
> >>>>    bytes_written+= ev->data_written;
> >>>>    DBUG_PRINT("info",("max_size: %lu",max_size));
> >>>> +  if (flush_and_sync())
> >>>> +    goto err;
> >>>>    if ((uint) my_b_append_tell(&log_file) > max_size)
> >>>>      new_file(0);
> >>>>  
> >>>> @@ -1652,6 +1654,8 @@ bool MYSQL_LOG::appendv(const char* buf,
> >>>>      bytes_written += len;
> >>>>    } while ((buf=va_arg(args,const char*)) &&
> (len=va_arg(args,uint)));
> >>>>    DBUG_PRINT("info",("max_size: %lu",max_size));
> >>>> +  if (flush_and_sync())
> >>>> +    goto err;
> >>>>    if ((uint) my_b_append_tell(&log_file) > max_size)
> >>>>      new_file(0);
> >>>>  
> >>>> @@ -1758,9 +1762,10 @@ bool MYSQL_LOG::flush_and_sync()
> >>>>    safe_mutex_assert_owner(&LOCK_log);
> >>>>    if (flush_io_cache(&log_file))
> >>>>      return 1;
> >>>> -  if (++sync_binlog_counter >= sync_binlog_period &&
> sync_binlog_period)
> >>>> +  uint sync_period= get_sync_period();
> >>>> +  if (sync_period && ++sync_counter >= sync_period)
> >>>>    {
> >>>> -    sync_binlog_counter= 0;
> >>>> +    sync_counter= 0;
> >>>>      err=my_sync(fd, MYF(MY_WME));
> >>>>    }
> >>>>    return err;
> >>>>
> >>>> === modified file 'sql/mysql_priv.h'
> >>>> --- a/sql/mysql_priv.h	2008-10-02 11:57:52 +0000
> >>>> +++ b/sql/mysql_priv.h	2008-10-27 15:09:43 +0000
> >>>> @@ -1310,10 +1310,11 @@ extern ulong max_binlog_size, max_relay_
> >>>>  extern ulong rpl_recovery_rank, thread_cache_size;
> >>>>  extern ulong back_log;
> >>>>  extern ulong specialflag, current_pid;
> >>>> -extern ulong expire_logs_days, sync_binlog_period,
> sync_binlog_counter;
> >>>> +extern ulong expire_logs_days;
> >>>> +extern uint sync_binlog_period, sync_relaylog_period;
> >>>>  extern ulong opt_tc_log_size, tc_log_max_pages_used,
> tc_log_page_size;
> >>>>  extern ulong tc_log_page_waits;
> >>>> -extern my_bool relay_log_purge, opt_innodb_safe_binlog,
> opt_innodb;
> >>>> +extern my_bool relay_log_purge, relay_log_throw,
> opt_innodb_safe_binlog, opt_innodb;
> >>>>  extern uint test_flags,select_errors,ha_open_options;
> >>>>  extern uint protocol_version, mysqld_port, dropping_tables;
> >>>>  extern uint delay_key_write_options, lower_case_table_names;
> >>>>
> >>>> === modified file 'sql/mysqld.cc'
> >>>> --- a/sql/mysqld.cc	2008-08-26 08:32:43 +0000
> >>>> +++ b/sql/mysqld.cc	2008-10-27 15:09:43 +0000
> >>>> @@ -404,7 +404,7 @@ ulong opt_ndb_cache_check_time;
> >>>>  const char *opt_ndb_mgmd;
> >>>>  ulong opt_ndb_nodeid;
> >>>>  #endif
> >>>> -my_bool opt_readonly, use_temp_pool, relay_log_purge;
> >>>> +my_bool opt_readonly, use_temp_pool, relay_log_purge,
> relay_log_throw;
> >>>>  my_bool opt_sync_frm, opt_allow_suspicious_udfs;
> >>>>  my_bool opt_secure_auth= 0;
> >>>>  char* opt_secure_file_priv= 0;
> >>>> @@ -466,7 +466,8 @@ ulong max_prepared_stmt_count;
> >>>>  */
> >>>>  ulong prepared_stmt_count=0;
> >>>>  ulong thread_id=1L,current_pid;
> >>>> -ulong slow_launch_threads = 0, sync_binlog_period;
> >>>> +ulong slow_launch_threads = 0;
> >>>> +uint sync_binlog_period= 0, sync_relaylog_period= 0;
> >>>>  ulong expire_logs_days = 0;
> >>>>  ulong rpl_recovery_rank=0;
> >>>>  
> >>>> @@ -4918,6 +4919,7 @@ enum options_mysqld
> >>>>    OPT_QUERY_CACHE_TYPE, OPT_QUERY_CACHE_WLOCK_INVALIDATE,
> OPT_RECORD_BUFFER,
> >>>>    OPT_RECORD_RND_BUFFER, OPT_DIV_PRECINCREMENT,
> OPT_RELAY_LOG_SPACE_LIMIT,
> >>>>    OPT_RELAY_LOG_PURGE,
> >>>> +  OPT_RELAY_LOG_THROW,
> >>>>    OPT_SLAVE_NET_TIMEOUT, OPT_SLAVE_COMPRESSED_PROTOCOL,
> OPT_SLOW_LAUNCH_TIME,
> >>>>    OPT_SLAVE_TRANS_RETRIES, OPT_READONLY, OPT_DEBUGGING,
> >>>>    OPT_SORT_BUFFER, OPT_TABLE_CACHE,
> >>>> @@ -4995,7 +4997,8 @@ enum options_mysqld
> >>>>    OPT_SECURE_FILE_PRIV,
> >>>>    OPT_KEEP_FILES_ON_CREATE,
> >>>>    OPT_INNODB_ADAPTIVE_HASH_INDEX,
> >>>> -  OPT_FEDERATED
> >>>> +  OPT_FEDERATED,
> >>>> +  OPT_SYNC_RELAY_LOG
> >>>>  };
> >>>>  
> >>>>
> >>>> @@ -6302,6 +6305,11 @@ The minimum value for this variable is 4
> >>>>     (gptr*) &relay_log_purge,
> >>>>     (gptr*) &relay_log_purge, 0, GET_BOOL, NO_ARG,
> >>>>     1, 0, 1, 0, 1, 0},
> >>>> +  {"relay_log_throw", OPT_RELAY_LOG_THROW,
> >>>> +   "0 = do not ignore retrieved relay logs. 1 = ignore retrieved
> relay logs.",
> >>>> +   (gptr*) &relay_log_throw,
> >>>> +   (gptr*) &relay_log_throw, 0, GET_BOOL, NO_ARG,
> >>>> +   0, 0, 1, 0, 1, 0},
> >>>>    {"relay_log_space_limit", OPT_RELAY_LOG_SPACE_LIMIT,
> >>>>     "Maximum space to use for all relay logs.",
> >>>>     (gptr*) &relay_log_space_limit,
> >>>> @@ -6342,8 +6350,13 @@ The minimum value for this variable is 4
> >>>>    {"sync-binlog", OPT_SYNC_BINLOG,
> >>>>     "Synchronously flush binary log to disk after every #th event.
> "
> >>>>     "Use 0 (default) to disable synchronous flushing.",
> >>>> -   (gptr*) &sync_binlog_period, (gptr*)
> &sync_binlog_period, 0, GET_ULONG,
> >>>> -   REQUIRED_ARG, 0, 0, ULONG_MAX, 0, 1, 0},
> >>>> +   (gptr*) &sync_binlog_period, (gptr*)
> &sync_binlog_period, 0, GET_UINT,
> >>>> +   REQUIRED_ARG, 0, 0, UINT_MAX, 0, 1, 0},
> >>>> +  {"sync-relay-log", OPT_SYNC_RELAY_LOG,
> >>>> +   "Synchronously flush relay log to disk after every #th event. "
> >>>> +   "Use 0 (default) to disable synchronous flushing.",
> >>>> +   (gptr *) &sync_relaylog_period, (gptr *)
> &sync_relaylog_period, 0, GET_UINT,
> >>>> +   REQUIRED_ARG, 0, 0, UINT_MAX, 0, 1, 0},
> >>>>    {"sync-frm", OPT_SYNC_FRM, "Sync .frm to disk on create. Enabled
> by default.",
> >>>>     (gptr*) &opt_sync_frm, (gptr*) &opt_sync_frm, 0,
> GET_BOOL, NO_ARG, 1, 0,
> >>>>     0, 0, 0, 0},
> >>>>
> >>>> === modified file 'sql/set_var.cc'
> >>>> --- a/sql/set_var.cc	2008-08-25 12:11:59 +0000
> >>>> +++ b/sql/set_var.cc	2008-10-27 15:09:43 +0000
> >>>> @@ -323,6 +323,8 @@ sys_var_thd_ulong	sys_div_precincrement(
> >>>>  #ifdef HAVE_REPLICATION
> >>>>  sys_var_bool_ptr	sys_relay_log_purge("relay_log_purge",
> >>>>                                              &relay_log_purge);
> >>>> +sys_var_bool_ptr	sys_relay_log_throw("relay_log_throw",
> >>>> +                                            &relay_log_throw);
> >>>>  #endif
> >>>>  sys_var_long_ptr	sys_rpl_recovery_rank("rpl_recovery_rank",
> >>>>  					      &rpl_recovery_rank);
> >>>> @@ -402,7 +404,8 @@ sys_var_thd_table_type  sys_table_type("
> >>>>  sys_var_thd_storage_engine sys_storage_engine("storage_engine",
> >>>>  				       &SV::table_type);
> >>>>  #ifdef HAVE_REPLICATION
> >>>> -sys_var_sync_binlog_period sys_sync_binlog_period("sync_binlog",
> &sync_binlog_period);
> >>>> +sys_var_int_ptr sys_sync_binlog_period("sync_binlog",
> &sync_binlog_period);
> >>>> +sys_var_int_ptr sys_sync_relaylog_period("sync_relay_log",
> &sync_relaylog_period);
> >>>>  #endif
> >>>>  sys_var_bool_ptr	sys_sync_frm("sync_frm", &opt_sync_frm);
> >>>>  sys_var_const_str	sys_system_time_zone("system_time_zone",
> >>>> @@ -733,6 +736,7 @@ sys_var *sys_variables[]=
> >>>>    &sys_read_rnd_buff_size,
> >>>>  #ifdef HAVE_REPLICATION
> >>>>    &sys_relay_log_purge,
> >>>> +  &sys_relay_log_throw,
> >>>>  #endif
> >>>>    &sys_rpl_recovery_rank,
> >>>>    &sys_safe_updates,
> >>>> @@ -762,6 +766,7 @@ sys_var *sys_variables[]=
> >>>>    &sys_storage_engine,
> >>>>  #ifdef HAVE_REPLICATION
> >>>>    &sys_sync_binlog_period,
> >>>> +  &sys_sync_relaylog_period,
> >>>>  #endif
> >>>>    &sys_sync_frm,
> >>>>    &sys_system_time_zone,
> >>>> @@ -1052,6 +1057,7 @@ struct show_var_st init_vars[]= {
> >>>>    {"relay_log_index", (char*) &opt_relaylog_index_name,
> SHOW_CHAR_PTR},
> >>>>    {"relay_log_info_file", (char*) &relay_log_info_file,
> SHOW_CHAR_PTR},
> >>>>    {sys_relay_log_purge.name,  (char*) &sys_relay_log_purge,    
>     SHOW_SYS},
> >>>> +  {sys_relay_log_throw.name,  (char*) &sys_relay_log_throw,    
>     SHOW_SYS},
> >>>>    {"relay_log_space_limit",  (char*) &relay_log_space_limit,   
>     SHOW_LONGLONG},
> >>>>  #endif
> >>>>    {sys_rpl_recovery_rank.name,(char*) &sys_rpl_recovery_rank,  
>     SHOW_SYS},
> >>>> @@ -1090,6 +1096,7 @@ struct show_var_st init_vars[]= {
> >>>>    {sys_storage_engine.name,   (char*) &sys_storage_engine,     
>     SHOW_SYS},
> >>>>  #ifdef HAVE_REPLICATION
> >>>>    {sys_sync_binlog_period.name,(char*) &sys_sync_binlog_period,
>     SHOW_SYS},
> >>>> +  {sys_sync_relaylog_period.name,(char*)
> &sys_sync_relaylog_period,     SHOW_SYS},
> >>>>  #endif
> >>>>    {sys_sync_frm.name,         (char*) &sys_sync_frm,           
>    SHOW_SYS},
> >>>>  #ifdef HAVE_TZNAME
> >>>> @@ -1486,6 +1493,23 @@ static bool get_unsigned(THD *thd, set_v
> >>>>  }
> >>>>  
> >>>>
> >>>> +bool sys_var_int_ptr::check(THD *thd, set_var *var)
> >>>> +{
> >>>> +  var->save_result.ulong_value= (ulong)
> var->value->val_int();
> >>>> +  return 0;
> >>>> +}
> >>>> +
> >>>> +bool sys_var_int_ptr::update(THD *thd, set_var *var)
> >>>> +{
> >>>> +  *value= (uint) var->save_result.ulong_value;
> >>>> +  return 0;
> >>>> +}
> >>>> +
> >>>> +void sys_var_int_ptr::set_default(THD *thd, enum_var_type type)
> >>>> +{
> >>>> +  *value= (uint) option_limits->def_value;
> >>>> +}
> >>>> +
> >>>>  sys_var_long_ptr::
> >>>>  sys_var_long_ptr(const char *name_arg, ulong *value_ptr_arg,
> >>>>                   sys_after_update_func after_update_arg)
> >>>> @@ -2759,13 +2783,6 @@ bool sys_var_slave_skip_counter::update(
> >>>>    pthread_mutex_unlock(&LOCK_active_mi);
> >>>>    return 0;
> >>>>  }
> >>>> -
> >>>> -
> >>>> -bool sys_var_sync_binlog_period::update(THD *thd, set_var *var)
> >>>> -{
> >>>> -  sync_binlog_period= (ulong) var->save_result.ulonglong_value;
> >>>> -  return 0;
> >>>> -}
> >>>>  #endif /* HAVE_REPLICATION */
> >>>>  
> >>>>  bool sys_var_rand_seed1::update(THD *thd, set_var *var)
> >>>>
> >>>> === modified file 'sql/set_var.h'
> >>>> --- a/sql/set_var.h	2008-01-23 15:03:58 +0000
> >>>> +++ b/sql/set_var.h	2008-10-27 15:09:43 +0000
> >>>> @@ -110,6 +110,26 @@ public:
> >>>>    { return (byte*) value; }
> >>>>  };
> >>>>  
> >>>> +/**
> >>>> +   Unsigned int system variable class
> >>>> + */
> >>>> +class sys_var_int_ptr :public sys_var
> >>>> +{
> >>>> +public:
> >>>> +  sys_var_int_ptr(const char *name_arg, uint *value_ptr_arg,
> >>>> +                  sys_after_update_func after_update_arg= NULL)
> >>>> +    :sys_var(name_arg, after_update_arg),
> >>>> +     value(value_ptr_arg)
> >>>> +  {}
> >>>> +  bool check(THD *thd, set_var *var);
> >>>> +  bool update(THD *thd, set_var *var);
> >>>> +  void set_default(THD *thd, enum_var_type type);
> >>>> +  SHOW_TYPE show_type() { return SHOW_INT; }
> >>>> +  byte *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base)
> >>>> +  { return (byte*) value; }
> >>>> +private:
> >>>> +  uint *value;
> >>>> +};
> >>>>  
> >>>>  /*
> >>>>    A global ulong variable that is protected by
> LOCK_global_system_variables
> >>>> @@ -550,11 +570,11 @@ public:
> >>>>    */
> >>>>  };
> >>>>  
> >>>> -class sys_var_sync_binlog_period :public sys_var_long_ptr
> >>>> +class sys_var_sync_binlog_period :public sys_var_int_ptr
> >>>>  {
> >>>>  public:
> >>>> -  sys_var_sync_binlog_period(const char *name_arg, ulong
> *value_ptr_arg)
> >>>> -    :sys_var_long_ptr(name_arg,value_ptr_arg) {}
> >>>> +  sys_var_sync_binlog_period(const char *name_arg, uint
> *value_ptr_arg)
> >>>> +    :sys_var_int_ptr(name_arg,value_ptr_arg) {}
> >>>>    bool update(THD *thd, set_var *var);
> >>>>  };
> >>>>  #endif
> >>>>
> >>>> === modified file 'sql/slave.cc'
> >>>> --- a/sql/slave.cc	2008-03-28 20:01:05 +0000
> >>>> +++ b/sql/slave.cc	2008-10-27 15:09:43 +0000
> >>>> @@ -66,6 +66,7 @@ static bool wait_for_relay_log_space(REL
> >>>>  static inline bool io_slave_killed(THD* thd,MASTER_INFO* mi);
> >>>>  static inline bool sql_slave_killed(THD* thd,RELAY_LOG_INFO* rli);
> >>>>  static int count_relay_log_space(RELAY_LOG_INFO* rli);
> >>>> +static int init_recovery(MASTER_INFO* mi);
> >>>>  static int init_slave_thread(THD* thd, SLAVE_THD_TYPE thd_type);
> >>>>  static int safe_connect(THD* thd, MYSQL* mysql, MASTER_INFO* mi);
> >>>>  static int safe_reconnect(THD* thd, MYSQL* mysql, MASTER_INFO* mi,
> >>>> @@ -174,6 +175,9 @@ int init_slave()
> >>>>    if (server_id && !master_host &&
> active_mi->host[0])
> >>>>      master_host= active_mi->host;
> >>>>  
> >>>> +  if (init_recovery(active_mi))
> >>>> +    goto err;
> >>>> +
> >>>>    /* If server id is not set, start_slave_thread() will say it */
> >>>>  
> >>>>    if (master_host && !opt_skip_slave_start)
> >>>> @@ -197,6 +201,48 @@ err:
> >>>>    DBUG_RETURN(1);
> >>>>  }
> >>>>  
> >>>> +static int init_recovery(MASTER_INFO* mi)
> >>>> +{
> >>>> +  const char* errmsg=0;
> >>>> +  DBUG_ENTER("recovery_init");
> >>>> +
> >>>>     
> >>>>         
> >>> A typo, should be "init_recovery"
> >>>   
> >>>       
> >> done in my own tree.
> >>     
> >>>   
> >>>       
> >>>> +  RELAY_LOG_INFO* rli = &mi->rli;
> >>>> +  if (relay_log_throw && rli->group_master_log_name[0])
> >>>> +  {
> >>>> +    mi->master_log_pos = max(BIN_LOG_HEADER_SIZE,
> >>>> +                              rli->group_master_log_pos);
> >>>> +    strmake(mi->master_log_name, rli->group_master_log_name,
> >>>> +      sizeof(mi->master_log_name)-1);
> >>>> +
> >>>> +    strmake(rli->group_relay_log_name,
> rli->relay_log.get_log_fname(),
> >>>> +            sizeof(rli->group_relay_log_name)-1);
> >>>> +    strmake(rli->event_relay_log_name,
> rli->relay_log.get_log_fname(),
> >>>> +            sizeof(mi->rli.event_relay_log_name)-1);
> >>>> +
> >>>> +    rli->group_relay_log_pos = rli->group_relay_log_pos =
> BIN_LOG_HEADER_SIZE;
> >>>> +
> >>>> +    if (init_relay_log_pos(rli,
> >>>> +                           rli->group_relay_log_name,
> >>>> +                           rli->group_relay_log_pos,
> >>>> +                           0 /*no data lock*/,
> >>>> +                           &errmsg, 0))
> >>>> +      DBUG_RETURN(1);
> >>>> +
> >>>> +    if (flush_master_info(mi, 0))
> >>>> +    {
> >>>> +      sql_print_error("Failed to flush master info file");
> >>>> +      DBUG_RETURN(1);
> >>>> +    }
> >>>> +    if (flush_relay_log_info(rli))
> >>>> +    {
> >>>> +       sql_print_error("Failed to flush master info file");
> >>>> +       DBUG_RETURN(1);
> >>>> +    }
> >>>>     
> >>>>         
> >>> I think you need to purge the discarded relay-log files here.
> >>>   
> >>>       
> >> Eventually, it will be discarded in the next call to the purge method.
> >> At this point I don't have a reference to a THD which is required to call
> >> the purge method.
> >>     
> >>>   
> >>>       
> >>>> +  }
> >>>> +
> >>>> +  DBUG_RETURN(0);
> >>>> +}
> >>>> +
> >>>>  
> >>>>  static void free_table_ent(TABLE_RULE_ENT* e)
> >>>>  {
> >>>> @@ -2582,6 +2628,7 @@ int flush_master_info(MASTER_INFO* mi, b
> >>>>  {
> >>>>    IO_CACHE* file = &mi->file;
> >>>>    char lbuf[22];
> >>>> +  int err= 0;
> >>>>    DBUG_ENTER("flush_master_info");
> >>>>    DBUG_PRINT("enter",("master_pos: %ld", (long)
> mi->master_log_pos));
> >>>>  
> >>>> @@ -2597,9 +2644,12 @@ int flush_master_info(MASTER_INFO* mi, b
> >>>>      When we come to this place in code, relay log may or not be
> initialized;
> >>>>      the caller is responsible for setting 'flush_relay_log_cache'
> accordingly.
> >>>>    */
> >>>> -  if (flush_relay_log_cache &&
> >>>> -      flush_io_cache(mi->rli.relay_log.get_log_file()))
> >>>> -    DBUG_RETURN(2);
> >>>> +  if (flush_relay_log_cache)
> >>>> +  {
> >>>> +    IO_CACHE *log_file= mi->rli.relay_log.get_log_file();
> >>>> +    if (flush_io_cache(log_file))
> >>>> +      DBUG_RETURN(2);
> >>>> +  }
> >>>>  
> >>>>    /*
> >>>>      We flushed the relay log BEFORE the master.info file, because
> if we crash
> >>>> @@ -2626,12 +2676,21 @@ int flush_master_info(MASTER_INFO* mi, b
> >>>>  	      mi->password, mi->port, mi->connect_retry,
> >>>>                (int)(mi->ssl), mi->ssl_ca, mi->ssl_capath,
> mi->ssl_cert,
> >>>>                mi->ssl_cipher, mi->ssl_key);
> >>>> -  DBUG_RETURN(-flush_io_cache(file));
> >>>> +  err= flush_io_cache(file);
> >>>> +  static unsigned int count=1;
> >>>> +  if (sync_relaylog_period && !err && count >
> sync_relaylog_period)
> >>>> +  {
> >>>> +    err= my_sync(mi->fd, MYF(MY_WME));
> >>>> +    count= 1;
> >>>> +  }
> >>>> +  count++;
> >>>> +  DBUG_RETURN(-err);
> >>>>  }
> >>>>  
> >>>>
> >>>>  st_relay_log_info::st_relay_log_info()
> >>>> -  :info_fd(-1), cur_log_fd(-1), save_temporary_tables(0),
> >>>> +  :info_fd(-1), cur_log_fd(-1),
> relay_log(&sync_relaylog_period),
> >>>> +   save_temporary_tables(0),
> >>>>     cur_log_old_open_count(0), group_master_log_pos(0),
> log_space_total(0),
> >>>>     ignore_log_space_limit(0), last_master_timestamp(0),
> slave_skip_counter(0),
> >>>>     abort_pos_wait(0), slave_run_id(0), sql_thd(0),
> last_slave_errno(0),
> >>>> @@ -4872,6 +4931,14 @@ bool flush_relay_log_info(RELAY_LOG_INFO
> >>>>      error=1;
> >>>>    if (flush_io_cache(file))
> >>>>      error=1;
> >>>> +  static unsigned int count= 1;
> >>>> +  if (sync_relaylog_period &&
> >>>> +      !error)
> >>>> +  {
> >>>> +    if (my_sync(rli->info_fd, MYF(MY_WME)))
> >>>> +      error=1;
> >>>> +  }
> >>>> +  count++;
> >>>>    /* Flushing the relay log is done by the slave I/O thread */
> >>>>    return error;
> >>>>  }
> >>>>
> >>>> === modified file 'sql/sql_class.h'
> >>>> --- a/sql/sql_class.h	2008-09-17 06:34:00 +0000
> >>>> +++ b/sql/sql_class.h	2008-10-27 15:09:43 +0000
> >>>> @@ -238,6 +238,18 @@ class MYSQL_LOG: public TC_LOG
> >>>>    bool no_auto_events;
> >>>>    friend class Log_event;
> >>>>  
> >>>> +  /* pointer to the sync period variable, for binlog this will be
> >>>> +     sync_binlog_period, for relay log this will be
> >>>> +     sync_relay_log_period
> >>>> +  */
> >>>> +  uint *sync_period_ptr;
> >>>> +  uint sync_counter;
> >>>> +
> >>>> +  inline uint get_sync_period()
> >>>> +  {
> >>>> +    return *sync_period_ptr;
> >>>> +  }
> >>>> +
> >>>>  public:
> >>>>    /*
> >>>>      These describe the log's format. This is used only for relay
> logs.
> >>>> @@ -250,7 +262,7 @@ public:
> >>>>    Format_description_log_event *description_event_for_exec,
> >>>>      *description_event_for_queue;
> >>>>  
> >>>> -  MYSQL_LOG();
> >>>> +  MYSQL_LOG(uint *sync_period=0);
> >>>>    /*
> >>>>      note that there's no destructor ~MYSQL_LOG() !
> >>>>      The reason is that we don't want it to be automatically called
> >>>>
> >>>>     
> >>>>         
> >>>
> >>>   
> >>>       
> >>     
> >
> >
> >