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0a224edc3e
log_group_read_log_seg() returns error when: 1) Calculated log block number does not correspond to read log block number. This can be caused by: a) Garbage or an incompletely written log block. We can exclude this case by checking log block checksum if it's enabled(see innodb-log-checksums, encrypted log block contains checksum always). b) The log block is overwritten. In this case checksum will be correct and read log block number will be greater then requested one. 2) When log block length is wrong. In this case recv_sys->found_corrupt_log is set. 3) When redo log block checksum is wrong. In this case innodb code writes messages to error log with the following prefix: "Invalid log block checksum." The fix processes all the cases above.
28 lines
1.1 KiB
Text
28 lines
1.1 KiB
Text
CREATE TABLE t(i INT) ENGINE=INNODB;
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INSERT INTO t VALUES
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(0), (1), (2), (3), (4), (5), (6), (7), (8), (9),
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(0), (1), (2), (3), (4), (5), (6), (7), (8), (9),
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(0), (1), (2), (3), (4), (5), (6), (7), (8), (9),
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(0), (1), (2), (3), (4), (5), (6), (7), (8), (9),
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(0), (1), (2), (3), (4), (5), (6), (7), (8), (9),
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(0), (1), (2), (3), (4), (5), (6), (7), (8), (9),
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(0), (1), (2), (3), (4), (5), (6), (7), (8), (9),
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(0), (1), (2), (3), (4), (5), (6), (7), (8), (9),
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(0), (1), (2), (3), (4), (5), (6), (7), (8), (9),
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(0), (1), (2), (3), (4), (5), (6), (7), (8), (9);
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# Generate enough data to overwrite innodb redo log
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# on the next "INSERT INTO t SELECT * FROM t" execution.
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INSERT INTO t SELECT * FROM t;
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INSERT INTO t SELECT * FROM t;
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INSERT INTO t SELECT * FROM t;
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INSERT INTO t SELECT * FROM t;
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INSERT INTO t SELECT * FROM t;
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INSERT INTO t SELECT * FROM t;
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INSERT INTO t SELECT * FROM t;
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INSERT INTO t SELECT * FROM t;
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INSERT INTO t SELECT * FROM t;
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# xtrabackup backup
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FOUND 1 /failed: redo log block is overwritten/ in backup.log
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FOUND 1 /failed: redo log block checksum does not match/ in backup.log
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FOUND 1 /failed: unknown reason/ in backup.log
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DROP TABLE t;
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