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Bug#29536710: MYSQL 8.0 IS 10% SLOWER THAN 5.7 AT WRITE-IO BOUND CASE
(once descripted as WL#13419 : InnoDB: extend 32-bit value compaction also for high value of unsigned in transaction log) Using undefined bit pattern of the current format, high unsigned value also can be packed to smaller bytes as higher its value is. (2 ~ 5 bytes) 1) increment LOG_HEADER_FORMAT to 4 The older parser detect as new format not to treat. 2) change the following 32-bit values packing 0xFF000000 ~ 0xFFFFFFFF : 0b11110000 + 4bytes to 0xFF000000 ~ 0xFFFDFFFF : 0b11111110 + 3bytes 0xFFFE0000 ~ 0xFFFFFBFF : 0b1111110n + 2bytes 0xFFFFFC00 ~ 0xFFFFFFFF : 0b111110nn + 1byte Approved by Pawel Olchawa <pawel.olchawa@oracle.com> RB: 22349
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Yasufumi Kinoshita
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Sep 30, 2019
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commit 3ee5f8b1f262c3014a4e6f267216869098ef151e
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