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S3 engine's s3_slave_ignore_updates=1 mode is broken.
The idea of this option is that the slave shall ignore update operations (e.g. CREATE TABLE, ALTER TABLE, etc), because the master has already made all the changes on S3.
But what if
- the slave is lagging behind (and executing events e.g. from yesterday)
- the master is using a different table definition today?
then, any statement that makes use of the table's definition will break.
Test case:
Put this into suite/s3/rpl_basic1.cnf
!include suite/rpl/rpl_1slave_base.cnf
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!include include/default_client.cnf
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[mysqld.1]
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plugin-maturity=alpha
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plugin-load-add=ha_s3.so
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s3-host-name="s3.amazonaws.com"
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s3-protocol-version="Amazon"
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s3-bucket=...
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s3-access-key=...
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s3-secret-key=...
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s3-region=...
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[mysqld.2]
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plugin-maturity=alpha
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plugin-load-add=ha_s3.so
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s3-host-name="s3.amazonaws.com"
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s3-protocol-version="Amazon"
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s3-bucket=...
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s3-access-key=...
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s3-secret-key=...
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s3-region=...
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Put this into suite/s3/rpl_basic1-slave.opt :
--s3_slave_ignore_updates=1
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Put this into suite/s3/rpl_basic1.test
--source include/master-slave.inc
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--sync_slave_with_master
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connection master;
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--disable_warnings
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drop table if exists ten, t1;
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--enable_warnings
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--sync_slave_with_master
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connection slave;
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stop slave;
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connection master;
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create table ten(a int primary key);
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insert into ten values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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create table t1 (a int, b int, c int);
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insert into t1 select a,a,a from ten;
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alter table t1 engine=s3;
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create view v1 as select a,b from t1;
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drop view v1;
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drop table t1;
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create table t1 (x int, y int, z int) ;
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insert into t1 select a,a,a from ten;
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alter table t1 engine=s3;
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connection slave;
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start slave;
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connection master;
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--sync_slave_with_master
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select * from t1;
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connection master;
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drop table t1;
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--sync_slave_with_master
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--source include/rpl_end.inc
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And run.
The test will fail with
mysqltest: At line 37: sync_slave_with_master failed: 'select
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master_pos_wait('master-bin.000001', 2389, 300, '')'
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returned NULL indicating slave SQL thread failure
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and the slave will be stopped with:
Last_Error Error 'Table 'test.t1' doesn't exist' on query. Default database:
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'test'. Query: 'CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost`
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SQL SECURITY DEFINER VIEW `v1` AS select a,b from t1'
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