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LOAD_FILE
LOAD_FILE is not safe to replicate in STATEMENT mode, because it
depends on a file (which is loaded on master and may not exist in
slave(s)). This leads to scenarios on which the slave replicates the
statement with 'load_file' and it will try to load the file from local
file system. Given that the file may not exist in the slave filesystem
the operation will not succeed (probably returning NULL), causing
master and slave(s) to diverge. However, when using MIXED mode
replication, this can be made to work, if the statement including
LOAD_FILE is marked as unsafe, triggering a switch to ROW mode,
meaning that the contents of the file are written to binlog as row
events. Consequently, the contents from the file in the master will
reach the slave via the binlog.
This patch addresses this bug by marking the load_file function as
unsafe. When in mixed mode and when LOAD_FILE is issued, there will be
a switch to row mode. Furthermore, when in statement mode, the
LOAD_FILE will raise a warning that the statement is unsafe in that
mode.
mysql-test/extra/rpl_tests/rpl_loadfile.test:
Extra file that is "sourced" on both rpl_loadfile and rpl_stm_loadfile
test files.
mysql-test/suite/rpl/r/rpl_loadfile.result:
Updated with the results from the test case added to this file.
mysql-test/suite/rpl/r/rpl_stm_loadfile.result:
Result file for rpl_loadfile test split with the warnings in statement
mode.
mysql-test/suite/rpl/t/rpl_loadfile.test:
After splitting the original rpl_loadfile file, this one is only
required to be executed in mixed or row format.
Appended the test for 39701 to this file.
mysql-test/suite/rpl/t/rpl_stm_loadfile.test:
Split the original rpl_loadfile test because load_file now raises
a warning when in statement mode. The goal of this split is
two-fold: i) make the test case more resilient; ii) assert that
warnings are indeed raised when in statement mode.
sql/item_create.cc:
Added the set_stmt_unsafe call to lex.
36 lines
1 KiB
Text
36 lines
1 KiB
Text
# Begin clean up test section
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--disable_warnings
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connection master;
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DROP PROCEDURE IF EXISTS test.p1;
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DROP TABLE IF EXISTS test.t1;
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--enable_warnings
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# Section 1 test
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CREATE TABLE test.t1 (a INT, blob_column LONGBLOB, PRIMARY KEY(a));
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INSERT INTO test.t1 VALUES(1,'test');
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UPDATE test.t1 SET blob_column=LOAD_FILE('../../std_data/words2.dat') WHERE a=1;
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delimiter |;
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create procedure test.p1()
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begin
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INSERT INTO test.t1 VALUES(2,'test');
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UPDATE test.t1 SET blob_column=LOAD_FILE('../../std_data/words2.dat') WHERE a=2;
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end|
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delimiter ;|
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CALL test.p1();
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SELECT * FROM test.t1 ORDER BY blob_column;
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save_master_pos;
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sync_slave_with_master;
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connection slave;
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# Need to allow some time when NDB engine is used for
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# the injector thread to have time to populate binlog
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let $wait_condition= SELECT INSTR(blob_column,'aberration') > 0 FROM test.t1 WHERE a = 2;
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--source include/wait_condition.inc
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SELECT * FROM test.t1 ORDER BY blob_column;
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# Cleanup
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connection master;
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DROP PROCEDURE IF EXISTS test.p1;
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DROP TABLE test.t1;
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sync_slave_with_master;
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