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| author | Alfranio Correia <alfranio.correia@sun.com> | 2010-01-20 19:08:16 +0000 |
|---|---|---|
| committer | Alfranio Correia <alfranio.correia@sun.com> | 2010-01-20 19:08:16 +0000 |
| commit | 0aa3aee0dad0962adb74bfb85c4b76ac8e15a810 (patch) | |
| tree | 6eab0274b9fabaa0e1c7701e4a5f85370f4e874a /sql/set_var.cc | |
| parent | fdf1441a5a8e0adf13a4579abb5926231b6b95af (diff) | |
| download | mariadb-git-0aa3aee0dad0962adb74bfb85c4b76ac8e15a810.tar.gz | |
BUG#46364 MyISAM transbuffer problems (NTM problem)
It is well-known that due to concurrency issues, a slave can become
inconsistent when a transaction contains updates to both transaction and
non-transactional tables in statement and mixed modes.
In a nutshell, the current code-base tries to preserve causality among the
statements by writing non-transactional statements to the txn-cache which
is flushed upon commit. However, modifications done to non-transactional
tables on behalf of a transaction become immediately visible to other
connections but may not immediately get into the binary log and therefore
consistency may be broken.
In general, it is impossible to automatically detect causality/dependency
among statements by just analyzing the statements sent to the server. This
happen because dependency may be hidden in the application code and it is
necessary to know a priori all the statements processed in the context of
a transaction such as in a procedure. Moreover, even for the few cases that
we could automatically address in the server, the computation effort
required could make the approach infeasible.
So, in this patch we introduce the option
- "--binlog-direct-non-transactional-updates" that can be used to bypass
the current behavior in order to write directly to binary log statements
that change non-transactional tables.
Diffstat (limited to 'sql/set_var.cc')
| -rw-r--r-- | sql/set_var.cc | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sql/set_var.cc b/sql/set_var.cc index 3c6b259045d..e06ad9dcc59 100644 --- a/sql/set_var.cc +++ b/sql/set_var.cc @@ -181,6 +181,8 @@ static sys_var_long_ptr sys_binlog_cache_size(&vars, "binlog_cache_size", &binlog_cache_size); static sys_var_thd_binlog_format sys_binlog_format(&vars, "binlog_format", &SV::binlog_format); +static sys_var_thd_bool sys_binlog_direct_non_trans_update(&vars, "binlog_direct_non_transactional_updates", + &SV::binlog_direct_non_trans_update); static sys_var_thd_ulong sys_bulk_insert_buff_size(&vars, "bulk_insert_buffer_size", &SV::bulk_insert_buff_size); static sys_var_const_os sys_character_sets_dir(&vars, |