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The current semi-sync binlog fail-over recovery process uses rpl_semi_sync_slave_enabled==TRUE as its condition to truncate a primary server’s binlog, as it is anticipating the server to re-join a replication topology as a replica. However, for servers configured with both rpl_semi_sync_master_enabled=1 and rpl_semi_sync_slave_enabled=1, if a primary is just re-started (i.e. retaining its role as master), it can truncate its binlog to drop transactions which its replica(s) has already received and executed. If this happens, when the replica reconnects, its gtid_slave_pos can be ahead of the recovered primary’s gtid_binlog_pos, resulting in an error state where the replica’s state is ahead of the primary’s. This patch changes the condition for semi-sync recovery to truncate the binlog to instead use the configuration variable --init-rpl-role, when set to SLAVE. This allows for both rpl_semi_sync_master_enabled and rpl_semi_sync_slave_enabled to be set for a primary that is restarted, and no transactions will be lost, so long as --init-rpl-role is not set to SLAVE. Reviewed By: ============ Sergei Golubchik <serg@mariadb.com>
104 lines
3 KiB
Text
104 lines
3 KiB
Text
# ==== Purpose ====
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#
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# Test verifies the truncation of single binary log file.
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#
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# ==== References ====
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#
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# MDEV-21117: recovery for --rpl-semi-sync-slave-enabled server
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--source include/have_innodb.inc
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--source include/have_aria.inc
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# File: binlog_truncate_active_log.inc included in test makes use of
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# 'debug_sync' facility.
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--source include/have_debug_sync.inc
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--source include/have_binlog_format_statement.inc
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call mtr.add_suppression("Can.t init tc log");
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call mtr.add_suppression("Aborting");
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# The following cases are tested:
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# A. 2pc transaction is followed by a blank "zero-engines" one
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# B. 2pc transaction follows the blank one
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# C. Similarly to A, with the XA blank transaction
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RESET MASTER;
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SET @@global.sync_binlog=1;
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CREATE TABLE t (f INT) ENGINE=INNODB;
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CREATE TABLE t2 (f INT) ENGINE=INNODB;
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CREATE TABLE t4 (f INT) ENGINE=INNODB;
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CREATE TABLE tm (f INT) ENGINE=Aria;
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# Old (pre-crash) binlog file index initial value.
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# It keeps incremented at the end of each case.
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--let $binlog_file_index=1
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--echo # Case A.
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# Using 'debug_sync' hold 'query1' execution after 'query1' is flushed and
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# synced to binary log but not yet committed. In an another connection hold
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# 'query2' execution after 'query2' is flushed and synced to binlog.
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# Crash and restart server with --init-rpl-role=SLAVE
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#
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# During recovery of binary log 'query1' status is checked with InnoDB engine,
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# it will be in prepared but not yet commited. All transactions starting from
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# 'query1' onwards will be removed from the binary log.
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# Show-binlog-events is to prove that.
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--let $truncate_gtid_pos = 0-1-7
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--let $query1 = INSERT INTO t VALUES (20)
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--let $query2 = DELETE FROM t2 WHERE f = 0 /* no such record */
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--source binlog_truncate_active_log.inc
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--echo # Case B.
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# The inverted sequence ends up to truncate starting from $query2
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--let $truncate_gtid_pos = 0-1-11
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--let $query1 = DELETE FROM t2 WHERE f = 0
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--let $query2 = INSERT INTO t VALUES (20)
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--source binlog_truncate_active_log.inc
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--echo # Case C.
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delimiter |;
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CREATE PROCEDURE sp_blank_xa()
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BEGIN
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XA START 'blank';
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DELETE FROM t2 WHERE f = 0 /* no such record */;
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XA END 'blank';
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XA PREPARE 'blank';
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END|
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delimiter ;|
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# The same as in A with $query2 being the zero-engine XA transaction.
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# Both $query1 and $query2 are going to be truncated.
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--let $truncate_gtid_pos = 0-1-15
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--let $query1 = INSERT INTO t VALUES (20)
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--let $query2 = CALL sp_blank_xa
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--source binlog_truncate_active_log.inc
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DROP PROCEDURE sp_blank_xa;
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--echo # Case D.
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delimiter |;
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CREATE PROCEDURE sp_xa()
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BEGIN
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XA START 'xid';
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DELETE FROM t WHERE f = 10;
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XA END 'xid';
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XA PREPARE 'xid';
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END|
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delimiter ;|
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# The same as in B with $query1 being the prepared XA transaction.
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# Truncation must occurs at $query2.
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--let $truncate_gtid_pos = 0-1-21
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--let $query1 = CALL sp_xa
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--let $query2 = INSERT INTO t2 VALUES (20)
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--source binlog_truncate_active_log.inc
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DROP PROCEDURE sp_xa;
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--echo # Cleanup
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DROP TABLE t,t2,tm;
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SET @@global.sync_binlog= default;
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--echo # End of the tests
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