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It is not safe to invoke trx_purge_free_segment() or execute innodb_undo_log_truncate=ON before all undo log records in the rollback segment has been processed. A prominent failure that would occur due to premature freeing of undo log pages is that trx_undo_get_undo_rec() would crash when trying to copy an undo log record to fetch the previous version of a record. If trx_undo_get_undo_rec() was not invoked in the unlucky time frame, then the symptom would be that some committed transaction history is never removed. This would be detected by CHECK TABLE...EXTENDED that was impleented in commit ab0190101b0587e0e03b2d75a967050b9a85fd1b. Such a garbage collection leak should be possible even when using innodb_undo_log_truncate=OFF, just involving trx_purge_free_segment(). trx_rseg_t::needs_purge: Change the type from Boolean to a transaction identifier, noting the most recent non-purged transaction, or 0 if everything has been purged. On transaction start, we initialize this to 1 more than the transaction start ID. On recovery, the field may be adjusted to the transaction end ID (TRX_UNDO_TRX_NO) if it is larger. The field TRX_UNDO_NEEDS_PURGE becomes write-only; only some debug assertions that would validate the value. The field reflects the old inaccurate Boolean field trx_rseg_t::needs_purge. trx_undo_mem_create_at_db_start(), trx_undo_lists_init(), trx_rseg_mem_restore(): Remove the parameter max_trx_id. Instead, store the maximum in trx_rseg_t::needs_purge, where trx_rseg_array_init() will find it. trx_purge_free_segment(): Contiguously hold a lock on trx_rseg_t to prevent any concurrent allocation of undo log. trx_purge_truncate_rseg_history(): Only invoke trx_purge_free_segment() if the rollback segment is empty and there are no pending transactions associated with it. trx_purge_truncate_history(): Only proceed with innodb_undo_log_truncate=ON if trx_rseg_t::needs_purge indicates that all history has been purged. Tested by: Matthias Leich
This directory contains test suites for the MariaDB server. To run currently existing test cases, execute ./mysql-test-run in this directory. Some tests are known to fail on some platforms or be otherwise unreliable. The file "unstable-tests" contains the list of such tests along with a comment for every test. To exclude them from the test run, execute # ./mysql-test-run --skip-test-list=unstable-tests In general you do not have to have to do "make install", and you can have a co-existing MariaDB installation, the tests will not conflict with it. To run the tests in a source directory, you must do "make" first. In Red Hat distributions, you should run the script as user "mysql". The user is created with nologin shell, so the best bet is something like # su - # cd /usr/share/mysql-test # su -s /bin/bash mysql -c "./mysql-test-run --skip-test-list=unstable-tests" This will use the installed MariaDB executables, but will run a private copy of the server process (using data files within /usr/share/mysql-test), so you need not start the mysqld service beforehand. You can omit --skip-test-list option if you want to check whether the listed failures occur for you. To clean up afterwards, remove the created "var" subdirectory, e.g. # su -s /bin/bash - mysql -c "rm -rf /usr/share/mysql-test/var" If one or more tests fail on your system on reasons other than listed in lists of unstable tests, please read the following manual section for instructions on how to report the problem: https://mariadb.com/kb/en/reporting-bugs If you want to use an already running MySQL server for specific tests, use the --extern option to mysql-test-run. Please note that in this mode, you are expected to provide names of the tests to run. For example, here is the command to run the "alias" and "analyze" tests with an external server: # mysql-test-run --extern socket=/tmp/mysql.sock alias analyze To match your setup, you might need to provide other relevant options. With no test names on the command line, mysql-test-run will attempt to execute the default set of tests, which will certainly fail, because many tests cannot run with an external server (they need to control the options with which the server is started, restart the server during execution, etc.) You can create your own test cases. To create a test case, create a new file in the main subdirectory using a text editor. The file should have a .test extension. For example: # xemacs t/test_case_name.test In the file, put a set of SQL statements that create some tables, load test data, and run some queries to manipulate it. Your test should begin by dropping the tables you are going to create and end by dropping them again. This ensures that you can run the test over and over again. If you are using mysqltest commands in your test case, you should create the result file as follows: # mysql-test-run --record test_case_name or # mysqltest --record < t/test_case_name.test If you only have a simple test case consisting of SQL statements and comments, you can create the result file in one of the following ways: # mysql-test-run --record test_case_name # mysql test < t/test_case_name.test > r/test_case_name.result # mysqltest --record --database test --result-file=r/test_case_name.result < t/test_case_name.test When this is done, take a look at r/test_case_name.result. If the result is incorrect, you have found a bug. In this case, you should edit the test result to the correct results so that we can verify that the bug is corrected in future releases. If you want to submit your test case you can send it to maria-developers@lists.launchpad.net or attach it to a bug report on https://mariadb.org/jira/. If the test case is really big or if it contains 'not public' data, then put your .test file and .result file(s) into a tar.gz archive, add a README that explains the problem, ftp the archive to ftp://ftp.mariadb.org/private and submit a report to https://mariadb.org/jira about it. The latest information about mysql-test-run can be found at: https://mariadb.com/kb/en/mariadb/mysqltest/ If you want to create .rdiff files, check https://mariadb.com/kb/en/mariadb/mysql-test-auxiliary-files/