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![]() This change adds new options for controlling the SST using the mariabackup method, which in many cases will allow much more effective management of the free space used during the SST process. Two new options have been added, which can be used in the configuration file by placing them in the [sst] section: 1) The 'sstdir' option sets the path to the temporary directory where the received files will be placed during the state transfer process in SST using mariabackup. Before this change, files were always written to a special directory <datadir>/.sst, which created a problem if the storage where datadir resides was close to full. Now, however, it is possible to specify an arbitrary directory where the system will place the files received during SST. Attention! The directory specified with sstdir will be deleted during the SST process – therefore, it cannot be the datadir itself or any important user directory containing valuable files! It must be a working temporary directory that will be automatically removed by the system at the end of SST. The user can also set the special value sstdir='mktemp'. In this case, the system will automatically create a working directory for SST using the mktemp utility (possibly using the tmpdir directory if it is specified in the configuration file). This directory will be deleted after the SST is completed. 2) The 'cleaning' option allows controlling the timing of the deletion of the current system state when SST is required. Currently, as well as by default after this change, the current state is deleted in parallel with the transfer of new data during SST. This is optimal in terms of performance but may cause problems if the storage where datadir resides has little free space and the same storage is used for receiving files – because the old files are not deleted immediately, but only after some time. If the user is interested in deleting the current state before the start of SST, which allows freeing up space on the datadir storage, they can now set the option cleaning='before', and the current state will be deleted before SST starts. This may be slower in terms of performance but frees up space, which can be critical in some user scenarios. On the other hand, the user can specify cleaning='after' – in this case, the current state will be deleted only after the successful completion of data transfer during SST. This reduces performance and requires more free space but guarantees that the current state will not be deleted on the node before the successful completion of data transfer – which can critically increase reliability in user scenarios where loss of state on nodes due to a chain of failures during SST transfer creates a risk of cluster degradation. If the user specifies cleaning='parallel' or does not set any value for this option, the system will operate as before – deleting the current state in parallel with receiving new data. This maximizes performance but requires large amounts of free space in the location specified by sstdir and may result in the loss of node state if data transfer during SST fails. |
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.. | ||
collections | ||
include | ||
lib | ||
main | ||
std_data | ||
suite | ||
asan.supp | ||
CMakeLists.txt | ||
dgcov.pl | ||
lsan.supp | ||
mariadb-stress-test.pl | ||
mariadb-test-run.pl | ||
mtr.out-of-source | ||
purify.supp | ||
README | ||
README-gcov | ||
README.stress | ||
suite.pm | ||
valgrind.supp |
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. In the file collections/smoke_test there is a list of tests that are expected to be stable. 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 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 tests fail on your system, 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 developers@lists.mariadb.org or attach it to a bug report on http://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/