Details
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Type:
Bug
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Status: Closed
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Priority:
Major
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Resolution: Fixed
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Affects Version/s: 10.0.16, 5.5.42
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Component/s: Tests
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Labels:
Description
Compare behavior in MySQL 5.5, MariaDB 5.5.41 and MariaDB 5.5.42:
MySQL 5.5
elenst@wheezy-64:~/git/mysql-5.5/mysql-test$ ls -l | grep var elenst@wheezy-64:~/git/mysql-5.5/mysql-test$ elenst@wheezy-64:~/git/mysql-5.5/mysql-test$ ls -l /dev/shm/ | grep var elenst@wheezy-64:~/git/mysql-5.5/mysql-test$ elenst@wheezy-64:~/git/mysql-5.5/mysql-test$ perl ./mtr main.1st --mem Logging: ./mtr main.1st --mem MySQL Version 5.5.42 ... Creating var directory '/data/repo/git/mysql-5.5/mysql-test/var'... - symlinking 'var' to '/dev/shm/var_auto_UXHl' ... Completed: All 1 tests were successful. elenst@wheezy-64:~/git/mysql-5.5/mysql-test$ ls -l | grep var lrwxrwxrwx 1 elenst disk 22 Feb 27 02:52 var -> /dev/shm/var_auto_UXHl elenst@wheezy-64:~/git/mysql-5.5/mysql-test$ ls -l /dev/shm/ | grep var drwxr-xr-x 8 elenst disk 180 Feb 27 02:52 var_auto_UXHl elenst@wheezy-64:~/git/mysql-5.5/mysql-test$ perl ./mtr main.1st --mem Logging: ./mtr main.1st --mem MySQL Version 5.5.42 ... Creating var directory '/data/repo/git/mysql-5.5/mysql-test/var'... - symlinking 'var' to '/dev/shm/var_auto_uUQE' ... Completed: All 1 tests were successful. elenst@wheezy-64:~/git/mysql-5.5/mysql-test$ ls -l | grep var lrwxrwxrwx 1 elenst disk 22 Feb 27 02:52 var -> /dev/shm/var_auto_uUQE elenst@wheezy-64:~/git/mysql-5.5/mysql-test$ ls -l /dev/shm/ | grep var drwxr-xr-x 8 elenst disk 180 Feb 27 02:52 var_auto_uUQE
This is good behavior: a new folder in /dev/shm gets created, the old one gets removed, var points at the new one.
MariaDB 5.5.41
elenst@wheezy-64:/data/releases/mariadb-5.5.41-linux-x86_64/mysql-test$ ls -l | grep var elenst@wheezy-64:/data/releases/mariadb-5.5.41-linux-x86_64/mysql-test$ ls -l /dev/shm/ | grep var elenst@wheezy-64:/data/releases/mariadb-5.5.41-linux-x86_64/mysql-test$ perl ./mtr main.1st --mem Logging: ./mtr main.1st --mem vardir: /data/releases/mariadb-5.5.41-linux-x86_64/mysql-test/var Removing old var directory... Creating var directory '/data/releases/mariadb-5.5.41-linux-x86_64/mysql-test/var'... - symlinking 'var' to '/dev/shm/var_auto_frKD' Checking supported features... ... Completed: All 1 tests were successful. elenst@wheezy-64:/data/releases/mariadb-5.5.41-linux-x86_64/mysql-test$ ls -l | grep var lrwxrwxrwx 1 elenst disk 22 Feb 27 02:56 var -> /dev/shm/var_auto_frKD elenst@wheezy-64:/data/releases/mariadb-5.5.41-linux-x86_64/mysql-test$ ls -l /dev/shm/ | grep var drwxr-xr-x 8 elenst disk 180 Feb 27 02:56 var_auto_frKD elenst@wheezy-64:/data/releases/mariadb-5.5.41-linux-x86_64/mysql-test$ perl ./mtr main.1st --mem Logging: ./mtr main.1st --mem vardir: /run/shm/var_auto_frKD Checking leftover processes... Removing old var directory... Creating var directory '/run/shm/var_auto_frKD'... Checking supported features... MariaDB Version 5.5.41-MariaDB ... Completed: All 1 tests were successful. elenst@wheezy-64:/data/releases/mariadb-5.5.41-linux-x86_64/mysql-test$ ls -l | grep var lrwxrwxrwx 1 elenst disk 22 Feb 27 02:56 var -> /dev/shm/var_auto_frKD elenst@wheezy-64:/data/releases/mariadb-5.5.41-linux-x86_64/mysql-test$ ls -l /dev/shm/ | grep var drwxr-xr-x 8 elenst disk 180 Feb 27 02:56 var_auto_frKD drwx------ 2 elenst disk 40 Feb 27 02:56 var_auto_nlxl
It's bad behavior: a new folder gets created, the old one is kept, var points at the old one. Eventually there will be lots of folders in /dev/shm, but it's only marginally dangerous since they all will be empty.
elenst@wheezy-64:~/git/5.5/mysql-test$ ls -l /dev/shm/ | grep var elenst@wheezy-64:~/git/5.5/mysql-test$ perl ./mtr 1st --mem Logging: ./mtr 1st --mem vardir: /data/repo/git/5.5/mysql-test/var Removing old var directory... Creating var directory '/data/repo/git/5.5/mysql-test/var'... - symlinking 'var' to '/dev/shm/var_auto_aE7b' Checking supported features... MariaDB Version 5.5.42-MariaDB-debug ... Completed: All 1 tests were successful. elenst@wheezy-64:~/git/5.5/mysql-test$ ls -l | grep var lrwxrwxrwx 1 elenst disk 22 Feb 27 02:59 var -> /dev/shm/var_auto_aE7b elenst@wheezy-64:~/git/5.5/mysql-test$ ls -l /dev/shm/ | grep var drwxr-xr-x 9 elenst disk 200 Feb 27 02:59 var_auto_aE7b elenst@wheezy-64:~/git/5.5/mysql-test$ perl ./mtr 1st --mem Logging: ./mtr 1st --mem vardir: /run/shm/var_auto_aE7b Checking leftover processes... Removing old var directory... Creating var directory '/run/shm/var_auto_aE7b'... - symlinking 'var' to '/dev/shm/var_auto_Ex34' Checking supported features... MariaDB Version 5.5.42-MariaDB-debug ... Completed: All 1 tests were successful. elenst@wheezy-64:~/git/5.5/mysql-test$ ls -l | grep var lrwxrwxrwx 1 elenst disk 22 Feb 27 02:59 var -> /dev/shm/var_auto_aE7b elenst@wheezy-64:~/git/5.5/mysql-test$ ls -l /dev/shm/ | grep var lrwxrwxrwx 1 elenst disk 22 Feb 27 02:59 var_auto_aE7b -> /dev/shm/var_auto_Ex34 drwxr-xr-x 9 elenst disk 200 Feb 27 02:59 var_auto_Ex34
This is awful behavior: a new folder gets created, instead of the old folder a link with the same name points at the new folder, var points at the old folder (now a link). Soon enough the chain becomes too long and further tests refuse to run.
At least the old behavior should be restored. Better still, it should work the way MySQL does.
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ok to push
Sergei Golubchik,
Could you please take a look?
http://lists.askmonty.org/pipermail/commits/2015-March/007508.html
I ran it through buildbot and also tried an out-of-source build, but there can always be some corner cases I didn't think of.