BUG#56343 binlog_cache_use status is bigger than expected

The binlog_cache_use is incremented twice when changes to a transactional table
are committed, i.e. TC_LOG_BINLOG::log_xid calls is called. The problem happens
because log_xid calls both binlog_flush_stmt_cache and binlog_flush_trx_cache
without checking if such caches are empty thus unintentionally increasing the
binlog_cache_use value twice.

To fix the problem we avoided incrementing the binlog_cache_use if the cache is
empty. We also decided to increment binlog_cache_use when the cache is truncated
as the cache is used although its content is discarded and is not written to the
binary log.

Note that binlog_cache_use is incremented for both types of cache, transactional
and non-transactional and that the behavior presented in this patch also applies
to the binlog_cache_disk_use.

Finally, we re-organized the code around the functions binlog_flush_trx_cache and
binlog_flush_stmt_cache.

mysql-test/extra/binlog_tests/binlog_cache_stat.test:
  Updated the test case with comments and additional tests to check both
  transactional and non-transactional changes and what happens when a 
  is transaction either committed or aborted.
mysql-test/suite/binlog/r/binlog_innodb.result:
  Updated the result file.
mysql-test/suite/binlog/r/binlog_mixed_cache_stat.result:
  Updated the result file.
mysql-test/suite/binlog/r/binlog_row_cache_stat.result:
  Updated the result file.
mysql-test/suite/binlog/r/binlog_stm_cache_stat.result:
  Updated the result file.
mysql-test/suite/binlog/t/binlog_mixed_cache_stat.test:
  Updated the test case with a new source file.
mysql-test/suite/binlog/t/binlog_row_cache_stat.test:
  Updated the test case with a new source file.
mysql-test/suite/binlog/t/binlog_stm_cache_stat.test:
  Updated the test case with a new source file.
sql/log_event.cc:
  Introduced debug information to check if Query_log_event("BEGIN"),
  Query_log_event("COMMIT") and Query_log_event("ROLLBACK").
sql/log_event.h:
  Guaranteed Xid_log_event is always classified as a transactional event.

mysql-test/extra/binlog_tests/binlog_cache_stat.test

+# Embedded server doesn't support binlog
+-- source include/not_embedded.inc
+-- source include/have_innodb.inc
+
+# Creating tables
+--disable_warnings
+drop table if exists t1, t2;
+--enable_warnings
+
+create table t1 (a int) engine=innodb;
+create table t2 (a int) engine=myisam;
+
+#
+# Let us test binlog_cache_use and binlog_cache_disk_use status vars.
+# Actually this test has nothing to do with innodb per se, it just
+# requires transactional table.
+#
+# This test checks binlog_cache_use and binlog_cache_disk_use when
+# transactions are committed and after when they are aborted.
+#
+
+#
+# Checking commit.
+#
+--echo **** Preparing the enviroment to check commit and its effect on
+--echo **** the binlog_cache_use and binlog_cache_disk_use.
+--echo **** Expected: binlog_cache_use = 0, binlog_cache_disk_use = 0.
+flush status;
+show status like "binlog_cache_use";
+show status like "binlog_cache_disk_use";
+
+--echo **** Now we are going to create transactional changes which are long enough so
+--echo **** they will be flushed to disk...
+--echo **** Expected: binlog_cache_use = 1, binlog_cache_disk_use = 1.
+let $1=2000;
+disable_query_log;
+begin;
+while ($1)
+{
+ eval insert into t1 values( $1 );
+ dec $1;
+}
+commit;
+enable_query_log;
+show status like "binlog_cache_use";
+show status like "binlog_cache_disk_use";
+
+--echo **** Transactional changes which should not be flushed to disk and so should not
+--echo **** increase binlog_cache_disk_use.
+--echo **** Expected: binlog_cache_use = 2, binlog_cache_disk_use = 1.
+begin;
+insert into t1 values( 1 );
+commit;
+show status like "binlog_cache_use";
+show status like "binlog_cache_disk_use";
+
+--echo **** Non-Transactional changes which should not be flushed to disk and so should not
+--echo **** increase binlog_cache_disk_use.
+--echo **** Expected: binlog_cache_use = 3, binlog_cache_disk_use = 1.
+begin;
+insert into t2 values( 1 );
+commit;
+show status like "binlog_cache_use";
+show status like "binlog_cache_disk_use";
+
+--echo **** Mixed changes which should not be flushed to disk and so should not
+--echo **** increase binlog_cache_disk_use.
+--echo **** Expected: binlog_cache_use = 5, binlog_cache_disk_use = 1.
+begin;
+insert into t1 values( 1 );
+insert into t2 values( 1 );
+commit;
+show status like "binlog_cache_use";
+show status like "binlog_cache_disk_use";
+
+#
+# Checking abort.
+#
+--echo **** Preparing the enviroment to check abort and its effect on
+--echo **** the binlog_cache_use and binlog_cache_disk_use
+--echo **** Expected: binlog_cache_use = 0, binlog_cache_disk_use = 0.
+flush status;
+show status like "binlog_cache_use";
+show status like "binlog_cache_disk_use";
+
+--echo **** Now we are going to create transactional changes which are long enough so
+--echo **** they will be flushed to disk...
+--echo **** Expected: binlog_cache_use = 1, binlog_cache_disk_use = 1.
+let $1=2000;
+disable_query_log;
+begin;
+while ($1)
+{
+ eval insert into t1 values( $1 );
+ dec $1;
+}
+rollback;
+enable_query_log;
+show status like "binlog_cache_use";
+show status like "binlog_cache_disk_use";
+
+--echo **** Transactional changes which should not be flushed to disk and so should not
+--echo **** increase binlog_cache_disk_use.
+--echo **** Expected: binlog_cache_use = 2, binlog_cache_disk_use = 1.
+begin;
+insert into t1 values( 1 );
+rollback;
+show status like "binlog_cache_use";
+show status like "binlog_cache_disk_use";
+
+--echo **** Non-Transactional changes which should not be flushed to disk and so should not
+--echo **** increase binlog_cache_disk_use.
+--echo **** Expected: binlog_cache_use = 3, binlog_cache_disk_use = 1.
+begin;
+insert into t2 values( 1 );
+rollback;
+show status like "binlog_cache_use";
+show status like "binlog_cache_disk_use";
+
+--echo **** Mixed changes which should not be flushed to disk and so should not
+--echo **** increase binlog_cache_disk_use.
+--echo **** Expected: binlog_cache_use = 5, binlog_cache_disk_use = 1.
+begin;
+insert into t1 values( 1 );
+insert into t2 values( 1 );
+rollback;
+show status like "binlog_cache_use";
+show status like "binlog_cache_disk_use";
+drop table t1, t2;

mysql-test/extra/binlog_tests/innodb_stat.test

-# Embedded server doesn't support binlog
--- source include/not_embedded.inc
--- source include/have_innodb.inc
-
-#
-# Let us test binlog_cache_use and binlog_cache_disk_use status vars.
-# Actually this test has nothing to do with innodb per se, it just requires
-# transactional table. 
-#
-flush status;
-show status like "binlog_cache_use";
-show status like "binlog_cache_disk_use";
---disable_warnings
-drop table if exists t1;
---enable_warnings
-
-create table t1 (a int) engine=innodb;
-
-# Now we are going to create transaction which is long enough so its 
-# transaction binlog will be flushed to disk...
-let $1=2000;
-disable_query_log;
-begin;
-while ($1)
-{
- eval insert into t1 values( $1 );
- dec $1;
-}
-commit;
-enable_query_log;
-show status like "binlog_cache_use";
-show status like "binlog_cache_disk_use";
-
-# Transaction which should not be flushed to disk and so should not
-# increase binlog_cache_disk_use.
-begin;
-delete from t1;
-commit;
-show status like "binlog_cache_use";
-show status like "binlog_cache_disk_use";
-drop table t1;

mysql-test/suite/binlog/r/binlog_innodb.result

@@ -123,7 +123,7 @@ Binlog_cache_disk_use	0
 create table t1 (a int) engine=innodb;
 show status like "binlog_cache_use";
 Variable_name	Value
-Binlog_cache_use	2
+Binlog_cache_use	1
 show status like "binlog_cache_disk_use";
 Variable_name	Value
 Binlog_cache_disk_use	1
@@ -132,7 +132,7 @@ delete from t1;
 commit;
 show status like "binlog_cache_use";
 Variable_name	Value
-Binlog_cache_use	4
+Binlog_cache_use	2
 show status like "binlog_cache_disk_use";
 Variable_name	Value
 Binlog_cache_disk_use	1

mysql-test/suite/binlog/r/binlog_mix_innodb_stat.result

-flush status;
-show status like "binlog_cache_use";
-Variable_name	Value
-Binlog_cache_use	0
-show status like "binlog_cache_disk_use";
-Variable_name	Value
-Binlog_cache_disk_use	0
-drop table if exists t1;
-create table t1 (a int) engine=innodb;
-show status like "binlog_cache_use";
-Variable_name	Value
-Binlog_cache_use	2
-show status like "binlog_cache_disk_use";
-Variable_name	Value
-Binlog_cache_disk_use	1
-begin;
-delete from t1;
-commit;
-show status like "binlog_cache_use";
-Variable_name	Value
-Binlog_cache_use	4
-show status like "binlog_cache_disk_use";
-Variable_name	Value
-Binlog_cache_disk_use	1
-drop table t1;

mysql-test/suite/binlog/r/binlog_mixed_cache_stat.result

+drop table if exists t1, t2;
+create table t1 (a int) engine=innodb;
+create table t2 (a int) engine=myisam;
+**** Preparing the enviroment to check commit and its effect on
+**** the binlog_cache_use and binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 0, binlog_cache_disk_use = 0.
+flush status;
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	0
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	0
+**** Now we are going to create transactional changes which are long enough so
+**** they will be flushed to disk...
+**** Expected: binlog_cache_use = 1, binlog_cache_disk_use = 1.
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	1
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Transactional changes which should not be flushed to disk and so should not
+**** increase binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 2, binlog_cache_disk_use = 1.
+begin;
+insert into t1 values( 1 );
+commit;
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	2
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Non-Transactional changes which should not be flushed to disk and so should not
+**** increase binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 3, binlog_cache_disk_use = 1.
+begin;
+insert into t2 values( 1 );
+commit;
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	3
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Mixed changes which should not be flushed to disk and so should not
+**** increase binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 5, binlog_cache_disk_use = 1.
+begin;
+insert into t1 values( 1 );
+insert into t2 values( 1 );
+commit;
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	5
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Preparing the enviroment to check abort and its effect on
+**** the binlog_cache_use and binlog_cache_disk_use
+**** Expected: binlog_cache_use = 0, binlog_cache_disk_use = 0.
+flush status;
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	0
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	0
+**** Now we are going to create transactional changes which are long enough so
+**** they will be flushed to disk...
+**** Expected: binlog_cache_use = 1, binlog_cache_disk_use = 1.
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	1
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Transactional changes which should not be flushed to disk and so should not
+**** increase binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 2, binlog_cache_disk_use = 1.
+begin;
+insert into t1 values( 1 );
+rollback;
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	2
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Non-Transactional changes which should not be flushed to disk and so should not
+**** increase binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 3, binlog_cache_disk_use = 1.
+begin;
+insert into t2 values( 1 );
+rollback;
+Warnings:
+Warning	1196	Some non-transactional changed tables couldn't be rolled back
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	3
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Mixed changes which should not be flushed to disk and so should not
+**** increase binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 5, binlog_cache_disk_use = 1.
+begin;
+insert into t1 values( 1 );
+insert into t2 values( 1 );
+rollback;
+Warnings:
+Warning	1196	Some non-transactional changed tables couldn't be rolled back
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	5
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+drop table t1, t2;

mysql-test/suite/binlog/r/binlog_row_cache_stat.result

+drop table if exists t1, t2;
+create table t1 (a int) engine=innodb;
+create table t2 (a int) engine=myisam;
+**** Preparing the enviroment to check commit and its effect on
+**** the binlog_cache_use and binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 0, binlog_cache_disk_use = 0.
+flush status;
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	0
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	0
+**** Now we are going to create transactional changes which are long enough so
+**** they will be flushed to disk...
+**** Expected: binlog_cache_use = 1, binlog_cache_disk_use = 1.
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	1
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Transactional changes which should not be flushed to disk and so should not
+**** increase binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 2, binlog_cache_disk_use = 1.
+begin;
+insert into t1 values( 1 );
+commit;
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	2
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Non-Transactional changes which should not be flushed to disk and so should not
+**** increase binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 3, binlog_cache_disk_use = 1.
+begin;
+insert into t2 values( 1 );
+commit;
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	3
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Mixed changes which should not be flushed to disk and so should not
+**** increase binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 5, binlog_cache_disk_use = 1.
+begin;
+insert into t1 values( 1 );
+insert into t2 values( 1 );
+commit;
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	5
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Preparing the enviroment to check abort and its effect on
+**** the binlog_cache_use and binlog_cache_disk_use
+**** Expected: binlog_cache_use = 0, binlog_cache_disk_use = 0.
+flush status;
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	0
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	0
+**** Now we are going to create transactional changes which are long enough so
+**** they will be flushed to disk...
+**** Expected: binlog_cache_use = 1, binlog_cache_disk_use = 1.
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	1
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Transactional changes which should not be flushed to disk and so should not
+**** increase binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 2, binlog_cache_disk_use = 1.
+begin;
+insert into t1 values( 1 );
+rollback;
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	2
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Non-Transactional changes which should not be flushed to disk and so should not
+**** increase binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 3, binlog_cache_disk_use = 1.
+begin;
+insert into t2 values( 1 );
+rollback;
+Warnings:
+Warning	1196	Some non-transactional changed tables couldn't be rolled back
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	3
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Mixed changes which should not be flushed to disk and so should not
+**** increase binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 5, binlog_cache_disk_use = 1.
+begin;
+insert into t1 values( 1 );
+insert into t2 values( 1 );
+rollback;
+Warnings:
+Warning	1196	Some non-transactional changed tables couldn't be rolled back
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	5
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+drop table t1, t2;

mysql-test/suite/binlog/r/binlog_row_innodb_stat.result

-flush status;
-show status like "binlog_cache_use";
-Variable_name	Value
-Binlog_cache_use	0
-show status like "binlog_cache_disk_use";
-Variable_name	Value
-Binlog_cache_disk_use	0
-drop table if exists t1;
-create table t1 (a int) engine=innodb;
-show status like "binlog_cache_use";
-Variable_name	Value
-Binlog_cache_use	2
-show status like "binlog_cache_disk_use";
-Variable_name	Value
-Binlog_cache_disk_use	1
-begin;
-delete from t1;
-commit;
-show status like "binlog_cache_use";
-Variable_name	Value
-Binlog_cache_use	4
-show status like "binlog_cache_disk_use";
-Variable_name	Value
-Binlog_cache_disk_use	1
-drop table t1;

mysql-test/suite/binlog/r/binlog_stm_cache_stat.result

+drop table if exists t1, t2;
+create table t1 (a int) engine=innodb;
+create table t2 (a int) engine=myisam;
+**** Preparing the enviroment to check commit and its effect on
+**** the binlog_cache_use and binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 0, binlog_cache_disk_use = 0.
+flush status;
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	0
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	0
+**** Now we are going to create transactional changes which are long enough so
+**** they will be flushed to disk...
+**** Expected: binlog_cache_use = 1, binlog_cache_disk_use = 1.
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	1
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Transactional changes which should not be flushed to disk and so should not
+**** increase binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 2, binlog_cache_disk_use = 1.
+begin;
+insert into t1 values( 1 );
+commit;
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	2
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Non-Transactional changes which should not be flushed to disk and so should not
+**** increase binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 3, binlog_cache_disk_use = 1.
+begin;
+insert into t2 values( 1 );
+commit;
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	3
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Mixed changes which should not be flushed to disk and so should not
+**** increase binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 5, binlog_cache_disk_use = 1.
+begin;
+insert into t1 values( 1 );
+insert into t2 values( 1 );
+commit;
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	5
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Preparing the enviroment to check abort and its effect on
+**** the binlog_cache_use and binlog_cache_disk_use
+**** Expected: binlog_cache_use = 0, binlog_cache_disk_use = 0.
+flush status;
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	0
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	0
+**** Now we are going to create transactional changes which are long enough so
+**** they will be flushed to disk...
+**** Expected: binlog_cache_use = 1, binlog_cache_disk_use = 1.
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	1
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Transactional changes which should not be flushed to disk and so should not
+**** increase binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 2, binlog_cache_disk_use = 1.
+begin;
+insert into t1 values( 1 );
+rollback;
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	2
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Non-Transactional changes which should not be flushed to disk and so should not
+**** increase binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 3, binlog_cache_disk_use = 1.
+begin;
+insert into t2 values( 1 );
+rollback;
+Warnings:
+Warning	1196	Some non-transactional changed tables couldn't be rolled back
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	3
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+**** Mixed changes which should not be flushed to disk and so should not
+**** increase binlog_cache_disk_use.
+**** Expected: binlog_cache_use = 5, binlog_cache_disk_use = 1.
+begin;
+insert into t1 values( 1 );
+insert into t2 values( 1 );
+rollback;
+Warnings:
+Warning	1196	Some non-transactional changed tables couldn't be rolled back
+show status like "binlog_cache_use";
+Variable_name	Value
+Binlog_cache_use	5
+show status like "binlog_cache_disk_use";
+Variable_name	Value
+Binlog_cache_disk_use	1
+drop table t1, t2;

mysql-test/suite/binlog/r/binlog_stm_innodb_stat.result

-flush status;
-show status like "binlog_cache_use";
-Variable_name	Value
-Binlog_cache_use	0
-show status like "binlog_cache_disk_use";
-Variable_name	Value
-Binlog_cache_disk_use	0
-drop table if exists t1;
-create table t1 (a int) engine=innodb;
-show status like "binlog_cache_use";
-Variable_name	Value
-Binlog_cache_use	2
-show status like "binlog_cache_disk_use";
-Variable_name	Value
-Binlog_cache_disk_use	1
-begin;
-delete from t1;
-commit;
-show status like "binlog_cache_use";
-Variable_name	Value
-Binlog_cache_use	4
-show status like "binlog_cache_disk_use";
-Variable_name	Value
-Binlog_cache_disk_use	1
-drop table t1;

mysql-test/suite/binlog/t/binlog_mix_innodb_stat.test → mysql-test/suite/binlog/t/binlog_mixed_cache_stat.test

@@ -2,4 +2,4 @@
 # For both statement and row based bin logs 9/19/2005 [jbm]
 
 -- source include/have_binlog_format_mixed.inc
--- source extra/binlog_tests/innodb_stat.test
+-- source extra/binlog_tests/binlog_cache_stat.test

mysql-test/suite/binlog/t/binlog_row_innodb_stat.test → mysql-test/suite/binlog/t/binlog_row_cache_stat.test

@@ -2,4 +2,4 @@
 # For both statement and row based bin logs 9/19/2005 [jbm]
 
 -- source include/have_binlog_format_row.inc
--- source extra/binlog_tests/innodb_stat.test
+-- source extra/binlog_tests/binlog_cache_stat.test

mysql-test/suite/binlog/t/binlog_stm_innodb_stat.test → mysql-test/suite/binlog/t/binlog_stm_cache_stat.test

@@ -2,4 +2,4 @@
 # For both statement and row based bin logs 9/19/2005 [jbm]
 
 -- source include/have_binlog_format_statement.inc
--- source extra/binlog_tests/innodb_stat.test
+-- source extra/binlog_tests/binlog_cache_stat.test

sql/log_event.cc

@@ -2537,6 +2537,22 @@ Query_log_event::Query_log_event(THD* thd_arg, const char* query_arg,
   bool trx_cache= FALSE;
   cache_type= Log_event::EVENT_INVALID_CACHE;
 
+#ifndef DBUG_OFF
+  /*
+    If debug is enabled, we make sure that begin, commit and rollback
+    have the cache_type exclusively defined by the param using_trans.
+    as this is important while checking if the correct cache is used.
+
+    Note this is the only way to accurately set the type of the cache
+    when a begin, commit or rollback event is created because such
+    events may be artificially produced to compose the binary log.
+  */
+  if (strncmp("BEGIN", query_arg, query_length) &&
+      strncmp("COMMIT", query_arg, query_length) &&
+      strncmp("ROLLBACK", query_arg, query_length))
+  {  
+#endif
+
   switch (lex->sql_command)
   {
     case SQLCOM_DROP_TABLE:
@@ -2574,6 +2590,15 @@ Query_log_event::Query_log_event(THD* thd_arg, const char* query_arg,
     cache_type= Log_event::EVENT_TRANSACTIONAL_CACHE;
   else
     cache_type= Log_event::EVENT_STMT_CACHE;
+
+#ifndef DBUG_OFF
+  }
+  else if (using_trans)
+    cache_type= Log_event::EVENT_TRANSACTIONAL_CACHE;
+  else
+    cache_type= Log_event::EVENT_STMT_CACHE;
+#endif
+
   DBUG_ASSERT(cache_type != Log_event::EVENT_INVALID_CACHE);
   DBUG_PRINT("info",("Query_log_event has flags2: %lu  sql_mode: %lu",
                      (ulong) flags2, sql_mode));

sql/log_event.h

@@ -2504,7 +2504,7 @@ class Xid_log_event: public Log_event
    my_xid xid;
 
 #ifdef MYSQL_SERVER
-  Xid_log_event(THD* thd_arg, my_xid x): Log_event(thd_arg,0,0), xid(x) {}
+  Xid_log_event(THD* thd_arg, my_xid x): Log_event(thd_arg, 0, TRUE), xid(x) {}
 #ifdef HAVE_REPLICATION
   void pack_info(Protocol* protocol);
 #endif /* HAVE_REPLICATION */