[MDEV-20060] Failing assertion: srv_log_file_size <= 512ULL << 30 while preparing backup - Jira

When too much redo log is generated during backup:

...

[00] 2019-07-04 10:05:31 Redo log (from LSN 369453697919029 to 370244323770496) was copied.

[00] 2019-07-04 10:05:31 completed OK!

mariabackup --prepare stage is terminated with the assertion failure:

[00] 2019-07-05 16:28:18 mariabackup: Using 34359738368 bytes for buffer pool (set by --use-memory parameter)

2019-07-05 16:28:18 139959018460992 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins

2019-07-05 16:28:18 139959018460992 [Note] InnoDB: Uses event mutexes

2019-07-05 16:28:18 139959018460992 [Note] InnoDB: Compressed tables use zlib 1.2.11

2019-07-05 16:28:18 139959018460992 [Note] InnoDB: Using Linux native AIO

2019-07-05 16:28:18 139959018460992 [Note] InnoDB: Number of pools: 1

2019-07-05 16:28:18 139959018460992 [Note] InnoDB: Using SSE2 crc32 instructions

2019-07-05 16:28:18 139959018460992 [Note] InnoDB: Initializing buffer pool, total size = 32G, instances = 1, chunk size = 32G

2019-07-05 16:28:19 139959018460992 [Note] InnoDB: Completed initialization of buffer pool

2019-07-05 16:28:19 139922236876544 [Note] InnoDB: page_cleaner coordinator priority: -20

2019-07-05 16:28:19 0x7f4abf941740  InnoDB: Assertion failure in file /home/buildbot/buildbot/build/storage/innobase/srv/srv0start.cc line 2053

InnoDB: Failing assertion: srv_log_file_size <= 512ULL << 30

...

Note the total redo log size during backup is 736G+:

MariaDB [(none)]> select abs(369453697919029 - 370244323770496)/(1024*1024*1024) as redo_log_size;

+---------------+

| redo_log_size |

+---------------+

|      736.3277 |

+---------------+

1 row in set (0.018 sec)

It seems InnoDB code used by mariabackup is not ready to process logs larger than 512G.

causes

MDEV-20421 big_innodb_log reliably fails on buildbot Windows

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