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This report is about a non-debug 10.5 build. Debug builds fail with an assertion failure from MDEV-18589. However, according to MDEV-18589, on non-debug builds it didn't have the failure described here, so I'm not sure it's the same problem.
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10.5 e290e5a7
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[00] 2020-06-16 15:12:21 page size for /dev/shm/var_xbackup_apply/backup_2//ibdata1.delta is 16384 bytes
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[00] 2020-06-16 15:12:21 Applying /dev/shm/var_xbackup_apply/backup_2//ibdata1.delta to ./ibdata1...
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[00] 2020-06-16 15:12:21 page size for /dev/shm/var_xbackup_apply/backup_2//test/alt_t1.ibd.delta is 8192 bytes
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[00] 2020-06-16 15:12:21 Can't create file ./test/alt_t1.ibd
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[00] 2020-06-16 15:12:21 error: can't open ./test/alt_t1.ibd
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[00] 2020-06-16 15:12:21 Error: xtrabackup_apply_delta(): failed to apply /dev/shm/var_xbackup_apply/backup_2//test/alt_t1.ibd.delta to ./test/alt_t1.ibd.
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To reproduce:
git clone https://github.com/MariaDB/randgen --branch mdev22913 rqg-mdev22913
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rqg-mdev22913
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perl ./runall-trials.pl --basedir=<basedir> --trials=5 --skip-gendata --duration=150 --threads=4 --scenario=MariaBackupIncremental --grammar=mdev22913.yy --vardir=/dev/shm/var_mdev22913
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Remember to set the basedir on the command line.
For reproducing, use a 10.5 non-debug build.
The grammar in the test above only contains single query:
query:
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CREATE OR REPLACE TABLE { 't'.$prng->int(1,9) } (b BIT) ENGINE=InnoDB ROW_FORMAT COMPRESSED;
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It currently fails every time for me, but there is always room for non-determinism.
The command line above runs the test 5 times, until it fails (in any way). Given the number of problems with incremental backup (or even any backup), it can occasionally fail with a different problem than the one described here. If you want to ignore all other ones and only focus on this one, run with the extra option
--output="Error: xtrabackup_apply_delta"
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Then it will ignore other errors and automatically continue running the configured 5 trials until it hits this exact failure.
Logs are attached.
In the community server, this failure was only observed on 10.5 non-debug.
10.4 and 10.5 debug and sometimes 10.4 non-debug fail with MDEV-18589 instead.
10.4 non-debug also fails non-deterministically with
2020-06-16 20:13:22 0 [ERROR] InnoDB: Plugin initialization aborted with error Generic error
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[00] FATAL ERROR: 2020-06-16 20:13:23 mariabackup: innodb_init() returned 11 (Generic error).
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(to be filed separately).
10.2 non-debug fails non-deterministically with MDEV-18550.
10.3 non-debug fails non-deterministically with
[00] FATAL ERROR: 2020-06-16 20:03:57 xtrabackup_copy_logfile() failed.
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mbackup_backup_0.log