[MDEV-18577] Indexes problem on import dump SQL Created: 2019-02-14  Updated: 2019-03-13  Resolved: 2019-03-13

Status: Closed
Project: MariaDB Server
Component/s: Galera
Affects Version/s: 10.2.22, 10.3.13
Fix Version/s: 10.2.23, 10.3.14, 10.4.4

Type: Bug Priority: Major
Reporter: Eric Brun Assignee: Jan Lindström (Inactive)
Resolution: Fixed Votes: 0
Labels: None
Environment:

Linux Debian 9 (Stretch)

Attachments: File galera_load_data.cnf     File galera_load_data.test    

 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

 Comments   
Comment by Elena Stepanova [ 2019-02-14 ]

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

Comment by Niels Hendriks [ 2019-03-04 ]

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...

Comment by Jan Lindström (Inactive) [ 2019-03-11 ]

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.
Comment by Jan Lindström (Inactive) [ 2019-03-11 ]

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
 
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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
 
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Completed: All 1 tests were successful.

Comment by Jan Lindström (Inactive) [ 2019-03-11 ]

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.

Comment by Eric Brun [ 2019-03-11 ]

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

Comment by Jan Lindström (Inactive) [ 2019-03-12 ]

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;

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