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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 | 985c06d0a9bd230cbab2e3cbfb7fbf744ea7ee3e (patch) | |
| tree | 6eab0274b9fabaa0e1c7701e4a5f85370f4e874a /sql/sql_class.h | |
| parent | 4839c42619304989a44dc8f57a800f311ae93bb4 (diff) | |
| download | mariadb-git-985c06d0a9bd230cbab2e3cbfb7fbf744ea7ee3e.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.
mysql-test/extra/rpl_tests/rpl_mixing_engines.inc:
Backported this from Celosia to improve the test cases related to the NTM issue.
sql/log.cc:
Checks the --binlog-direct-non-transactional-updates before choosing
to either use the trxn-cache or not.
sql/mysqld.cc:
Introduces the option --binlog-direct-non-transactional-updates.
sql/set_var.cc:
Introduces the option --binlog-direct-non-transactional-updates.
sql/sql_class.h:
Introduces the option --binlog-direct-non-transactional-updates.
Diffstat (limited to 'sql/sql_class.h')
| -rw-r--r-- | sql/sql_class.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sql/sql_class.h b/sql/sql_class.h index 8acc03f929d..56d31be79c7 100644 --- a/sql/sql_class.h +++ b/sql/sql_class.h @@ -353,6 +353,7 @@ struct system_variables ulong ndb_index_stat_cache_entries; ulong ndb_index_stat_update_freq; ulong binlog_format; // binlog format for this thd (see enum_binlog_format) + my_bool binlog_direct_non_trans_update; /* In slave thread we need to know in behalf of which thread the query is being run to replicate temp tables properly |