Details

    • Bug
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Fixed
    • 10.2.22, 10.3.13
    • 10.2.23, 10.3.14, 10.4.4
    • Galera
    • None
    • Linux Debian 9 (Stretch)

    Description

      Hi,

      I tested importing dump on MariaDB + Galera (2 nodes Master-Master) as follow :

      • Create a db
      • import dump sql (table in INNODB) on Node 1

      When I check some index cardinalities, I have on node 1 the right value and on node 2 null value (0) e.g :

      Node 1 : index on column username (varchar 255 utf-8) : cardinality =38250
      Node 2 : index username : cardinality = 0

      Indexes are not updated on node 2 and SQL queries on MariaDB Node 2 are too slow !

      I tested different versions :

      MariaDB 10.1.37 (Debian Stretch version) : cardinality is OK : no problem (but not same cardinality ...) !
      MariaDB 10.2.22 (Debian MariaDB repository) : cardinality is NOT ok : problem
      MariaDB 10.3.12 (Debian MariaDB repository) : cardinality is NOT ok : problem

      I run OPTIMIZE Table on Node 2 for build indexes and then indexes are managed on Node 2. Strange things too : the cardinalities are always differentes on the 2 nodes ...

      Hope, you will be able to take a look ...

      Thank's

      Eric

      Attachments

        Activity

          jplindst, it looks like another case of the problem with statistics.

          elenst Elena Stepanova added a comment - jplindst , it looks like another case of the problem with statistics.

          Hi,

          Disappointed my bug with this issue https://jira.mariadb.org/browse/MDEV-18226 was closed as NOT-A-BUG . Hoping this can get another look and fixed since more people are now reporting this as well...

          nielsh Niels Hendriks added a comment - Hi, Disappointed my bug with this issue https://jira.mariadb.org/browse/MDEV-18226 was closed as NOT-A-BUG . Hoping this can get another look and fixed since more people are now reporting this as well...

          I tested with 2 galera nodes issuing both load data infile and huge insert on first node. In both nodes index cardinalities and other info was fine. However, please remember that

          • Index/table statistics is not updated immediately after a load or insert. Table(s) in load or insert could be processed by InnoDB background table statistic calculation i.e. correct index stats can be visible after some time (not deterministic). This can happen on both galera nodes.
          • Index statistics calculation is based on picking some pages semi-randomly, analyzing them, and deriving some conclusions about the entire table and/or index from those analyzed pages. This semi-random method could lead the fact that galera nodes do not have identical index/table statistics.
          • InnoDB persistent index/table statistic is written inside a InnoDB bypassing all the galera replication, thus changes done there to innodb_index_stats and innodb_table_stats tables is not replicated by galera replication.
          jplindst Jan Lindström (Inactive) added a comment - I tested with 2 galera nodes issuing both load data infile and huge insert on first node. In both nodes index cardinalities and other info was fine. However, please remember that Index/table statistics is not updated immediately after a load or insert. Table(s) in load or insert could be processed by InnoDB background table statistic calculation i.e. correct index stats can be visible after some time (not deterministic). This can happen on both galera nodes. Index statistics calculation is based on picking some pages semi-randomly, analyzing them, and deriving some conclusions about the entire table and/or index from those analyzed pages. This semi-random method could lead the fact that galera nodes do not have identical index/table statistics. InnoDB persistent index/table statistic is written inside a InnoDB bypassing all the galera replication, thus changes done there to innodb_index_stats and innodb_table_stats tables is not replicated by galera replication.

          Here is example from 10.1 using 2 node galera cluster (see actual test case attached and note the --sleep 10 on both nodes after data is inserted):

          jan@jan-laptop-asus:~/mysql/10.1-galera/mysql-test$ ./mtr galera_load_data,xtradb
          Logging: ./mtr  galera_load_data,xtradb
          vardir: /home/jan/mysql/10.1-galera/mysql-test/var
          Checking leftover processes...
           - found old pid 20409 in 'mysqld.2.pid', killing it...
             process did not exist!
          Removing old var directory...
          Creating var directory '/home/jan/mysql/10.1-galera/mysql-test/var'...
          Checking supported features...
          MariaDB Version 10.1.39-MariaDB-debug
           - SSL connections supported
           - binaries are debug compiled
          Sphinx 'indexer' binary not found, sphinx suite will be skipped
          Collecting tests...
          Installing system database...
           
          ==============================================================================
           
          TEST                                      RESULT   TIME (ms) or COMMENT
          --------------------------------------------------------------------------
           
          worker[1] Using MTR_BUILD_THREAD 300, with reserved ports 16000..16019
          create database cardtest02;
          use cardtest02;
          CREATE TABLE `cardtest_tbl` (
          `id` bigint(18) NOT NULL AUTO_INCREMENT,
          `course` bigint(18) NOT NULL,
          `name` varchar(200) DEFAULT NULL,
          `intro` longtext DEFAULT NULL,
          `introformat` smallint(4) DEFAULT 0,
          `timecreated` bigint(18) NOT NULL,
          `timemodified` bigint(18) NOT NULL,
          `grademethod` varchar(255) DEFAULT NULL,
          `grade` decimal(10,5) DEFAULT NULL,
          `updategradeoncompletion` tinyint(2) DEFAULT 1,
          `competencyoncompletion` varchar(255) DEFAULT NULL,
          `evaluationmethod` varchar(255) DEFAULT NULL,
          `completionmethod` varchar(255) DEFAULT NULL,
          `alloweddates` varchar(1024) DEFAULT NULL,
          `allowedslots` varchar(1024) DEFAULT NULL,
          `permissions` smallint(4) DEFAULT NULL,
          `notifications` varchar(1024) DEFAULT NULL,
          `type` varchar(255) DEFAULT NULL,
          PRIMARY KEY (`id`)
          ) ENGINE=InnoDB AUTO_INCREMENT=1324 DEFAULT CHARSET=utf8 ROW_FORMAT=COMPRESSED;
          LOCK TABLES `cardtest_tbl` WRITE;
          ALTER TABLE `cardtest_tbl` DISABLE KEYS;
          Warnings:
          Note	1031	Storage engine InnoDB of the table `cardtest02`.`cardtest_tbl` doesn't have this option
          INSERT INTO `cardtest_tbl` VALUES 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          ALTER TABLE `cardtest_tbl` ENABLE KEYS;
          Warnings:
          Note	1031	Storage engine InnoDB of the table `cardtest02`.`cardtest_tbl` doesn't have this option
          UNLOCK TABLES;
          use cardtest02;
          show indexes from cardtest_tbl;
          Table	cardtest_tbl
          Non_unique	0
          Key_name	PRIMARY
          Seq_in_index	1
          Column_name	id
          Collation	A
          Cardinality	301
          Sub_part	NULL
          Packed	NULL
          Null	
          Index_type	BTREE
          Comment	
          Index_comment	
          select * from information_schema.tables WHERE TABLE_NAME = 'cardtest_tbl';
          TABLE_CATALOG	def
          TABLE_SCHEMA	cardtest02
          TABLE_NAME	cardtest_tbl
          TABLE_TYPE	BASE TABLE
          ENGINE	InnoDB
          VERSION	10
          ROW_FORMAT	Compressed
          TABLE_ROWS	301
          AVG_ROW_LENGTH	81
          DATA_LENGTH	24576
          MAX_DATA_LENGTH	0
          INDEX_LENGTH	0
          DATA_FREE	0
          AUTO_INCREMENT	1324
          CREATE_TIME	2019-03-11 12:46:49
          UPDATE_TIME	NULL
          CHECK_TIME	NULL
          TABLE_COLLATION	utf8_general_ci
          CHECKSUM	NULL
          CREATE_OPTIONS	row_format=COMPRESSED
          TABLE_COMMENT	
          select count(*) from cardtest_tbl;
          count(*)	301
          set session wsrep_sync_wait=15;
          use cardtest02;
          show indexes from cardtest_tbl;
          Table	cardtest_tbl
          Non_unique	0
          Key_name	PRIMARY
          Seq_in_index	1
          Column_name	id
          Collation	A
          Cardinality	301
          Sub_part	NULL
          Packed	NULL
          Null	
          Index_type	BTREE
          Comment	
          Index_comment	
          select * from information_schema.tables WHERE TABLE_NAME = 'cardtest_tbl';
          TABLE_CATALOG	def
          TABLE_SCHEMA	cardtest02
          TABLE_NAME	cardtest_tbl
          TABLE_TYPE	BASE TABLE
          ENGINE	InnoDB
          VERSION	10
          ROW_FORMAT	Compressed
          TABLE_ROWS	301
          AVG_ROW_LENGTH	81
          DATA_LENGTH	24576
          MAX_DATA_LENGTH	0
          INDEX_LENGTH	0
          DATA_FREE	0
          AUTO_INCREMENT	1324
          CREATE_TIME	2019-03-11 12:46:49
          UPDATE_TIME	NULL
          CHECK_TIME	NULL
          TABLE_COLLATION	utf8_general_ci
          CHECKSUM	NULL
          CREATE_OPTIONS	row_format=COMPRESSED
          TABLE_COMMENT	
          select count(*) from cardtest_tbl;
          count(*)	301
          use test;
          drop database cardtest02;
          galera.galera_load_data 'xtradb'         [ pass ]  22228
          --------------------------------------------------------------------------
          The servers were restarted 0 times
          Spent 22.228 of 42 seconds executing testcases
           
          Completed: All 1 tests were successful.
          

          jplindst Jan Lindström (Inactive) added a comment - Here is example from 10.1 using 2 node galera cluster (see actual test case attached and note the --sleep 10 on both nodes after data is inserted): jan@jan-laptop-asus:~/mysql/10.1-galera/mysql-test$ ./mtr galera_load_data,xtradb Logging: ./mtr galera_load_data,xtradb vardir: /home/jan/mysql/10.1-galera/mysql-test/var Checking leftover processes... - found old pid 20409 in 'mysqld.2.pid', killing it... process did not exist! Removing old var directory... Creating var directory '/home/jan/mysql/10.1-galera/mysql-test/var'... Checking supported features... MariaDB Version 10.1.39-MariaDB-debug - SSL connections supported - binaries are debug compiled Sphinx 'indexer' binary not found, sphinx suite will be skipped Collecting tests... Installing system database...   ==============================================================================   TEST RESULT TIME (ms) or COMMENT --------------------------------------------------------------------------   worker[1] Using MTR_BUILD_THREAD 300, with reserved ports 16000..16019 create database cardtest02; use cardtest02; CREATE TABLE `cardtest_tbl` ( `id` bigint(18) NOT NULL AUTO_INCREMENT, `course` bigint(18) NOT NULL, `name` varchar(200) DEFAULT NULL, `intro` longtext DEFAULT NULL, `introformat` smallint(4) DEFAULT 0, `timecreated` bigint(18) NOT NULL, `timemodified` bigint(18) NOT NULL, `grademethod` varchar(255) DEFAULT NULL, `grade` decimal(10,5) DEFAULT NULL, `updategradeoncompletion` tinyint(2) DEFAULT 1, `competencyoncompletion` varchar(255) DEFAULT NULL, `evaluationmethod` varchar(255) DEFAULT NULL, `completionmethod` varchar(255) DEFAULT NULL, `alloweddates` varchar(1024) DEFAULT NULL, `allowedslots` varchar(1024) DEFAULT NULL, `permissions` smallint(4) DEFAULT NULL, `notifications` varchar(1024) DEFAULT NULL, `type` varchar(255) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=1324 DEFAULT CHARSET=utf8 ROW_FORMAT=COMPRESSED; LOCK TABLES `cardtest_tbl` WRITE; ALTER TABLE `cardtest_tbl` DISABLE KEYS; Warnings: Note 1031 Storage engine InnoDB of the table `cardtest02`.`cardtest_tbl` doesn't have this option INSERT INTO `cardtest_tbl` VALUES 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ALTER TABLE `cardtest_tbl` ENABLE KEYS; Warnings: Note 1031 Storage engine InnoDB of the table `cardtest02`.`cardtest_tbl` doesn't have this option UNLOCK TABLES; use cardtest02; show indexes from cardtest_tbl; Table cardtest_tbl Non_unique 0 Key_name PRIMARY Seq_in_index 1 Column_name id Collation A Cardinality 301 Sub_part NULL Packed NULL Null Index_type BTREE Comment Index_comment select * from information_schema.tables WHERE TABLE_NAME = 'cardtest_tbl'; TABLE_CATALOG def TABLE_SCHEMA cardtest02 TABLE_NAME cardtest_tbl TABLE_TYPE BASE TABLE ENGINE InnoDB VERSION 10 ROW_FORMAT Compressed TABLE_ROWS 301 AVG_ROW_LENGTH 81 DATA_LENGTH 24576 MAX_DATA_LENGTH 0 INDEX_LENGTH 0 DATA_FREE 0 AUTO_INCREMENT 1324 CREATE_TIME 2019-03-11 12:46:49 UPDATE_TIME NULL CHECK_TIME NULL TABLE_COLLATION utf8_general_ci CHECKSUM NULL CREATE_OPTIONS row_format=COMPRESSED TABLE_COMMENT select count(*) from cardtest_tbl; count(*) 301 set session wsrep_sync_wait=15; use cardtest02; show indexes from cardtest_tbl; Table cardtest_tbl Non_unique 0 Key_name PRIMARY Seq_in_index 1 Column_name id Collation A Cardinality 301 Sub_part NULL Packed NULL Null Index_type BTREE Comment Index_comment select * from information_schema.tables WHERE TABLE_NAME = 'cardtest_tbl'; TABLE_CATALOG def TABLE_SCHEMA cardtest02 TABLE_NAME cardtest_tbl TABLE_TYPE BASE TABLE ENGINE InnoDB VERSION 10 ROW_FORMAT Compressed TABLE_ROWS 301 AVG_ROW_LENGTH 81 DATA_LENGTH 24576 MAX_DATA_LENGTH 0 INDEX_LENGTH 0 DATA_FREE 0 AUTO_INCREMENT 1324 CREATE_TIME 2019-03-11 12:46:49 UPDATE_TIME NULL CHECK_TIME NULL TABLE_COLLATION utf8_general_ci CHECKSUM NULL CREATE_OPTIONS row_format=COMPRESSED TABLE_COMMENT select count(*) from cardtest_tbl; count(*) 301 use test; drop database cardtest02; galera.galera_load_data 'xtradb' [ pass ] 22228 -------------------------------------------------------------------------- The servers were restarted 0 times Spent 22.228 of 42 seconds executing testcases   Completed: All 1 tests were successful.

          If you have a test case where index/table statistics is newer or far too lazily updated on galera nodes please provide one. If you agree on my findings, I will close this MDEV also as not a bug.

          jplindst Jan Lindström (Inactive) added a comment - If you have a test case where index/table statistics is newer or far too lazily updated on galera nodes please provide one. If you agree on my findings, I will close this MDEV also as not a bug.
          erbru Eric Brun added a comment -

          I ran your test file on my cluster Maria DB 10.3.13

          In my mysql client, the cardinality on* node 1 is 301*
          *On node 2 is 0
          *

          Node 1 :
          --------

          Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
          cardtest_tbl	0	PRIMARY	1	id	A	6	NULL	NULL		BTREE
          TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	TABLE_TYPE	ENGINE	VERSION	ROW_FORMAT	TABLE_ROWS	AVG_ROW_LENGTH	DATA_LENGTH	MAX_DATA_LENGTH	INDEX_LENGTH	DATA_FREE	AUTO_INCREMENT	CREATE_TIME	UPDATE_TIME	CHECK_TIME	TABLE_COLLATION	CHECKSUM	CREATE_OPTIONS	TABLE_COMMENT	MAX_INDEX_LENGTH	TEMPORARY
          def	cardtest02	cardtest_tbl	BASE TABLE	InnoDB	10	Compressed	6	1365	8192	0	0	0	1324	2019-03-11 16:55:55	2019-03-11 16:55:56	NULL	utf8_general_ci	NULL	row_format=COMPRESSED		0	N
          count(*)
          301
          

          Node 2 :
          ---------

          Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
          cardtest_tbl	0	PRIMARY	1	id	A	0	NULL	NULL		BTREE
          TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	TABLE_TYPE	ENGINE	VERSION	ROW_FORMAT	TABLE_ROWS	AVG_ROW_LENGTH	DATA_LENGTH	MAX_DATA_LENGTH	INDEX_LENGTH	DATA_FREE	AUTO_INCREMENT	CREATE_TIME	UPDATE_TIME	CHECK_TIMETABLE_COLLATION	CHECKSUM	CREATE_OPTIONS	TABLE_COMMENT	MAX_INDEX_LENGTH	TEMPORARY
          def	cardtest02	cardtest_tbl	BASE TABLE	InnoDB	10	Compressed	0	0	8192	0	0	0	1324	2019-03-11 16:55:55	2019-03-11 16:55:56	NULL	utf8_general_ci	NULL	row_format=COMPRESSED		0N
          count(*)
          301
          

          erbru Eric Brun added a comment - I ran your test file on my cluster Maria DB 10.3.13 In my mysql client, the cardinality on* node 1 is 301* *On node 2 is 0 * Node 1 : -------- Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment cardtest_tbl 0 PRIMARY 1 id A 6 NULL NULL BTREE TABLE_CATALOG TABLE_SCHEMA TABLE_NAME TABLE_TYPE ENGINE VERSION ROW_FORMAT TABLE_ROWS AVG_ROW_LENGTH DATA_LENGTH MAX_DATA_LENGTH INDEX_LENGTH DATA_FREE AUTO_INCREMENT CREATE_TIME UPDATE_TIME CHECK_TIME TABLE_COLLATION CHECKSUM CREATE_OPTIONS TABLE_COMMENT MAX_INDEX_LENGTH TEMPORARY def cardtest02 cardtest_tbl BASE TABLE InnoDB 10 Compressed 6 1365 8192 0 0 0 1324 2019 - 03 - 11 16 : 55 : 55 2019 - 03 - 11 16 : 55 : 56 NULL utf8_general_ci NULL row_format=COMPRESSED 0 N count(*) 301 Node 2 : --------- Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment cardtest_tbl 0 PRIMARY 1 id A 0 NULL NULL BTREE TABLE_CATALOG TABLE_SCHEMA TABLE_NAME TABLE_TYPE ENGINE VERSION ROW_FORMAT TABLE_ROWS AVG_ROW_LENGTH DATA_LENGTH MAX_DATA_LENGTH INDEX_LENGTH DATA_FREE AUTO_INCREMENT CREATE_TIME UPDATE_TIME CHECK_TIMETABLE_COLLATION CHECKSUM CREATE_OPTIONS TABLE_COMMENT MAX_INDEX_LENGTH TEMPORARY def cardtest02 cardtest_tbl BASE TABLE InnoDB 10 Compressed 0 0 8192 0 0 0 1324 2019 - 03 - 11 16 : 55 : 55 2019 - 03 - 11 16 : 55 : 56 NULL utf8_general_ci NULL row_format=COMPRESSED 0N count(*) 301

          Confirmed you issue. MariaDB >= 10.2 tries to avoid lock waits caused by persistent statistic calculation during galera brute force (BF) execution. For some reason transaction is marked as BF during ALTER TABLE `cardtest_tbl` ENABLE KEYS;

          jplindst Jan Lindström (Inactive) added a comment - Confirmed you issue. MariaDB >= 10.2 tries to avoid lock waits caused by persistent statistic calculation during galera brute force (BF) execution. For some reason transaction is marked as BF during ALTER TABLE `cardtest_tbl` ENABLE KEYS;

          People

            jplindst Jan Lindström (Inactive)
            erbru Eric Brun
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