{"id":12978,"date":"2019-11-12T14:06:09","date_gmt":"2019-11-12T13:06:09","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/galera-cluster-4-with-mariadb-10-4-8-part-2\/"},"modified":"2019-11-12T14:06:09","modified_gmt":"2019-11-12T13:06:09","slug":"galera-cluster-4-with-mariadb-10-4-8-part-2","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/galera-cluster-4-with-mariadb-10-4-8-part-2\/","title":{"rendered":"Galera Cluster 4 with MariaDB 10.4.8: part 2"},"content":{"rendered":"<p><span data-offset-key=\"h18k-0-0\">My <a href=\"https:\/\/www.dbi-services.com\/blog\/galera-cluster-4-with-mariadb-10-4-8\/\" target=\"_blank\" rel=\"noopener noreferrer\">previous<\/a> blog was about the MariaDB Galera cluster new features (version 10.4).<br \/>\nNow I will only focus on the streaming replication and give you an overview of all the tests I performed.<\/span><\/p>\n<h2>How to enable streaming replication?<\/h2>\n<p>Quite easy, there are only 2 parameters:<br \/>\n<strong>wsrep_trx_fragment_unit and wsrep_trx_fragment_size<\/strong><br \/>\nThen you have to choose a replication unit between the followings:<br \/>\n. <strong>bytes<\/strong> and the fragment size is in bytes<br \/>\n. <strong>rows <\/strong>and the fragment size is as big as the number of rows defined<br \/>\n. <strong>statements<\/strong> and the fragment size is as the number of statements in a fragment<br \/>\n<span data-offset-key=\"h18k-0-8\">Per default, the wsrep_trx_fragment_unit is in &#8220;bytes&#8221;. <\/span><span class=\"hardreadability\"><span data-offset-key=\"h18k-1-0\">To enable the streaming replication, set the wsrep_trx_fragment_size to a value different from 0<\/span><\/span><span data-offset-key=\"h18k-2-0\">.<br \/>\n<\/span><span data-offset-key=\"h18k-0-0\">Now, depending on your activity, select the right one to manage your big transactions.<br \/>\nThe best way is to test all three units with different fragment size.<br \/>\nFor my tests, I use a MariaDB Galera Cluster 10.4.8 of 3 master nodes running on CentOS Linux release 7.5,<br \/>\nI export a table of more than 400.000 rows, delete all rows and reimport it using different scenarios.<\/span><br \/>\n<strong>Without the streaming Replication<\/strong><\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">MariaDB [mysql]&gt; select @@wsrep_trx_fragment_unit, @@wsrep_trx_fragment_size;\n+------------------------------------+-------------------------------------+\n| @@wsrep_trx_fragment_unit          | @@wsrep_trx_fragment_size\u00a0\u00a0\u00a0\u00a0\u00a0      |\n+------------------------------------+-------------------------------------+\n| bytes\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0 |\n+------------------------------------+-------------------------------------+\n1 row in set (0.000 sec);\nMariaDB [employees]&gt; select * into outfile '\/tmp\/titles.txt' fields terminated by ',' optionally enclosed by '\"'\n-&gt; lines terminated by 'n' from employees.titles;\nQuery OK, 443308 rows affected (0.338 sec)\nMariaDB [employees]&gt; delete from titles;\nQuery OK, 443308 rows affected (5.780 sec)\nMariaDB [employees]&gt; load data infile '\/tmp\/titles.txt' into table titles fields terminated by ',' optionally enclosed by '\"' lines terminated by 'n';\nQuery OK, 443308 rows affected (6.230 sec)\nRecords: 443308 Deleted: 0 Skipped: 0 Warnings: 0<\/pre>\n<p><strong>With streaming replication and statement unit<\/strong><\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">MariaDB [employees]&gt; set session wsrep_trx_fragment_unit='statements';SET SESSION wsrep_trx_fragment_size=3;\nMariaDB [employees]&gt; load data infile '\/tmp\/titles.txt' into table titles fields terminated by ',' optionally enclosed by '\"' lines terminated by 'n';\nQuery OK, 443308 rows affected (6.717 sec)\nRecords: 443308  Deleted: 0  Skipped: 0  Warnings: 0\nMariaDB [employees]&gt; set session wsrep_trx_fragment_unit='statements';SET SESSION wsrep_trx_fragment_size=5;\nMariaDB [employees]&gt; load data infile '\/tmp\/titles.txt' into table titles fields terminated by ',' optionally enclosed by '\"' lines terminated by 'n';\nQuery OK, 443308 rows affected (6.476 sec)\nRecords: 443308  Deleted: 0  Skipped: 0  Warnings: 0\nMariaDB [employees]&gt; set session wsrep_trx_fragment_unit='statements';SET SESSION wsrep_trx_fragment_size=10;\nMariaDB [employees]&gt; load data infile '\/tmp\/titles.txt' into table titles fields terminated by ',' optionally enclosed by '\"' lines terminated by 'n';\nQuery OK, 443308 rows affected (6.473 sec)\nMariaDB [employees]&gt; set session wsrep_trx_fragment_unit='statements';SET SESSION wsrep_trx_fragment_size=100;\nMariaDB [employees]&gt; delete from titles;\nQuery OK, 443308 rows affected (6.638 sec)\nMariaDB [employees]&gt; load data infile '\/tmp\/titles.txt' into table titles fields terminated by ',' optionally enclosed by '\"' lines terminated by 'n';\nQuery OK, 443308 rows affected (6.392 sec)\nRecords: 443308 Deleted: 0 Skipped: 0 Warnings: 0<\/pre>\n<div class=\"\" data-block=\"true\" data-editor=\"dcd4g\" data-offset-key=\"h18k-0-0\">\n<div class=\"public-DraftStyleDefault-block public-DraftStyleDefault-ltr\" data-offset-key=\"6rm7k-0-0\">\n<p>We can see here that the time to delete all rows and to reimport the table are almost the same. Galera did not use, whatever the fragment size, the streaming replication.<br \/>\nAnother way to check and to be sure of it, is to\u00a0 query the system table mysql.wsrep_streaming_log.<br \/>\nIf it is always empty, the streaming replication is never used.<\/p>\n<\/div>\n<\/div>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">MariaDB [mysql]&gt; select count(*) from mysql.wsrep_streaming_log;\n+----------+\n| count(*) |\n+----------+\n| 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\n+----------+\n1 row in set (0.000 sec)<\/pre>\n<p><strong>With streaming replication and<\/strong> <strong>rows then bytes unit<\/strong><\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">MariaDB [employees]&gt; set session wsrep_trx_fragment_unit='rows';SET SESSION wsrep_trx_fragment_size=3;\nMariaDB [employees]&gt; load data infile '\/tmp\/titles.txt' into table titles fields terminated by ',' optionally enclosed by '\"' lines terminated by 'n';\nQuery OK, 443308 rows affected (6 min 7.889 sec)\nRecords: 443308 Deleted: 0 Skipped: 0 Warnings: 0\nMariaDB [employees]&gt; set session wsrep_trx_fragment_unit='rows';SET SESSION wsrep_trx_fragment_size=5;\nMariaDB [employees]&gt; load data infile '\/tmp\/titles.txt' into table titles fields terminated by ',' optionally enclosed by '\"' lines terminated by 'n';\nQuery OK, 443308 rows affected (3 min 19.940 sec)\nRecords: 443308 Deleted: 0 Skipped: 0 Warnings: 0\nMariaDB [employees]&gt; set session wsrep_trx_fragment_unit='rows';SET SESSION wsrep_trx_fragment_size=100;\nMariaDB [employees]&gt; load data infile '\/tmp\/titles.txt' into table titles fields terminated by ',' optionally enclosed by '\"' lines terminated by 'n';\nQuery OK, 443308 rows affected (22.546 sec)\nRecords: 443308 Deleted: 0 Skipped: 0 Warnings: 0\nMariaDB [employees]&gt; set session wsrep_trx_fragment_unit='rows';SET SESSION wsrep_trx_fragment_size=200;\nMariaDB [employees]&gt; load data infile '\/tmp\/titles.txt' into table titles fields terminated by ',' optionally enclosed by '\"' lines terminated by 'n';\nQuery OK, 443308 rows affected (15.449 sec)\nRecords: 443308 Deleted: 0 Skipped: 0 Warnings: 0\nMariaDB [employees]&gt; set session wsrep_trx_fragment_unit='rows';SET SESSION wsrep_trx_fragment_size=2000;\nMariaDB [employees]&gt; delete from titles;\nQuery OK, 443308 rows affected (8.405 sec)\nMariaDB [employees]&gt; load data infile '\/tmp\/titles.txt' into table titles fields terminated by ',' optionally enclosed by '\"' lines terminated by 'n';\nQuery OK, 443308 rows affected (7.443 sec)\nRecords: 443308  Deleted: 0  Skipped: 0  Warnings: 0\nMariaDB [employees]&gt; set session wsrep_trx_fragment_unit='bytes';SET SESSION wsrep_trx_fragment_size=10000;\nMariaDB [employees]&gt; delete from titles;\nQuery OK, 443308 rows affected (10.722 sec)\nMariaDB [employees]&gt; set session wsrep_trx_fragment_unit='bytes';SET SESSION wsrep_trx_fragment_size=20000;\nMariaDB [employees]&gt; load data infile '\/tmp\/titles.txt' into table titles fields terminated by ',' optionally enclosed by '\"' lines terminated by 'n';\nQuery OK, 443308 rows affected (8.899 sec)\nRecords: 443308  Deleted: 0  Skipped: 0  Warnings: 0<\/code><\/pre>\n<p><span data-offset-key=\"h18k-0-0\">We can see for both units, streaming replication is always used. The more fragments you have, the faster it will be to delete and reload the table.<\/span><\/p>\n<h2>Conclusion:<\/h2>\n<div class=\"\" data-block=\"true\" data-editor=\"dcd4g\" data-offset-key=\"h18k-0-0\">\n<div class=\"public-DraftStyleDefault-block public-DraftStyleDefault-ltr\" data-offset-key=\"h18k-0-0\"><span data-offset-key=\"h18k-0-0\">To use the streaming replication, you first identify large and long running transactions. Execute then the same transaction without activating the streaming replication as a reference. Set the streaming replication at the session level. Perfom tests against this transaction using different units and fragment size. <\/span><span class=\"veryhardreadability\"><span data-offset-key=\"h18k-1-0\">Check if the streaming replication is running by querying the system table mysql.wsrep_streaming_log<\/span><\/span><span data-offset-key=\"h18k-2-0\">.<br \/>\nWhen the execution time <\/span><span class=\"passivevoice\"><span data-offset-key=\"h18k-3-0\">is closed<\/span><\/span><span data-offset-key=\"h18k-4-0\"> to the referenced one then use these values.<br \/>\n<\/span><span class=\"hardreadability\"><span data-offset-key=\"h18k-5-0\">One last thing, do not forget to disable the streaming replication from your current session<\/span><\/span><span data-offset-key=\"h18k-6-0\">. Reset to 0 the wsrep_trx_fragment_size, otherwise following transactions could suffer from these settings.<\/span><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>My previous blog was about the MariaDB Galera cluster new features (version 10.4). Now I will only focus on the streaming replication and give you an overview of all the tests I performed. How to enable streaming replication? Quite easy, there are only 2 parameters: wsrep_trx_fragment_unit and wsrep_trx_fragment_size Then you have to choose a replication [&hellip;]<\/p>\n","protected":false},"author":28,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229],"tags":[38,1731,141,1738],"type_dbi":[],"class_list":["post-12978","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","tag-cluster","tag-galera","tag-mariadb","tag-streaming-replication"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Galera Cluster 4 with MariaDB 10.4.8: part 2 - dbi Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/galera-cluster-4-with-mariadb-10-4-8-part-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Galera Cluster 4 with MariaDB 10.4.8: part 2\" \/>\n<meta property=\"og:description\" content=\"My previous blog was about the MariaDB Galera cluster new features (version 10.4). 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