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  1. MariaDB Server
  2. MDEV-19552

DROP TABLE locks SHOW CREATE TABLE and SELECT with sorting since 10.1.34

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      Description

      After upgrade from 10.1.30 to 10.1.34 (10.1.40 affected too) we discovery that drop table locks many queries like 'show create table ....' on working server (15-25 Krps).
      Drop of just created table works unexpected long for table about 250Krows, 80 Mb on server with SSD and big buffer pool (140Gb and 400Gb):

      • about 0.1 sec on empty 140G buffer pool (after start)
      • about 1 sec on full 140G buffer pool
      • about 3 sec on full 400G buffer pool

      Script to reproduce:

      #!/bin/bash                                                                              
                                                                                               
      tmp=`mktemp`
      tmp1=`mktemp`                                                                            
      tmp2=`mktemp`                                                                            
                                                                                               
      mysql -h server >$tmp <<EOF
      use tmp;
      drop table if exists sss1, sss2, sss3;
      create table sss1 like  search.company_search_summary_table;                             
      insert into sss1 select * from search.company_search_summary_table ;                     
      EOF
                                                                                               
                                                                                               
      (
      mysql -t -h server >$tmp1 <<EOF                                                        
      select "drop";
      set profiling = 1;
      drop table tmp.sss1;
      show profile source;
      status;                                                                                  
      EOF
      ) &
          
      (
      mysql -t -h server >$tmp2  <<EOF                                                       
      set profiling = 1;
      show create table sys.date_time;                                                         
      show profile source;
      show create table sys.date_time;                                                         
      show profile source;                                                                     
      show create table sys.date_time;                                                         
      show profile source;                                                                     
      show create table sys.date_time;                                                         
      show profile source;
      status;
      EOF
      ) &
       
      wait
      head -n400 $tmp $tmp1 $tmp2 
      /bin/rm -f $tmp $tmp1 $tmp2
      

      Output

      $ cat /tmp/aa
      ==> /tmp/tmp.Fn4nIpaTFj <==
       
      ==> /tmp/tmp.L9qGfzb24e <==
      +------+
      | drop |
      +------+
      | drop |
      +------+
      +----------------------+----------+-----------------------+--------------+-------------+
      | Status               | Duration | Source_function       | Source_file  | Source_line |
      +----------------------+----------+-----------------------+--------------+-------------+
      | starting             | 0.000035 | NULL                  | NULL         |        NULL |
      | checking permissions | 0.000028 | check_access          | sql_parse.cc |        6154 |
      | Opening tables       | 0.000039 | open_tables           | sql_base.cc  |        4532 |
      | After opening tables | 0.000024 | open_tables           | sql_base.cc  |        4779 |
      | System lock          | 0.000024 | mysql_lock_tables     | lock.cc      |         308 |
      | Table lock           | 0.000066 | mysql_lock_tables     | lock.cc      |         313 |
      | closing tables       | 0.000023 | close_thread_tables   | sql_base.cc  |         919 |
      | Unlocking tables     | 1.101685 | mysql_unlock_tables   | lock.cc      |         396 |
      | query end            | 0.000102 | mysql_execute_command | sql_parse.cc |        5706 |
      | closing tables       | 0.000059 | close_thread_tables   | sql_base.cc  |         919 |
      | freeing items        | 0.000050 | mysql_parse           | sql_parse.cc |        7466 |
      | updating status      | 0.000062 | dispatch_command      | sql_parse.cc |        1954 |
      | cleaning up          | 0.000049 | dispatch_command      | sql_parse.cc |        1973 |
      +----------------------+----------+-----------------------+--------------+-------------+
      --------------
      mysql  Ver 15.1 Distrib 10.1.37-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2
       
      Connection id:          3742891
      Current database:
      Current user:           user@10.10.8.36
      SSL:                    Not in use
      Current pager:          stdout
      Using outfile:          ''
      Using delimiter:        ;
      Server:                 MariaDB
      Server version:         10.1.34-MariaDB MariaDB Server
      Protocol version:       10
      Connection:             server via TCP/IP
      Server characterset:    utf8
      Db     characterset:    utf8
      Client characterset:    utf8
      Conn.  characterset:    utf8
      TCP port:               3306
      Uptime:                 42 min 35 sec
       
      Threads: 688  Questions: 55997878  Slow queries: 0  Opens: 8070  Flush tables: 1  Open tables: 2033  Queries per second avg: 21916.977
      --------------
       
       
      ==> /tmp/tmp.RX2wgWmf9w <==
      +-----------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | Table     | Create Table                                                                                                                                                                                                |
      +-----------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | date_time | CREATE TABLE `date_time` (
        `date` int(10) unsigned NOT NULL DEFAULT '0',
        `name` varchar(255) NOT NULL DEFAULT 'unknown',
        PRIMARY KEY (`name`)
      ) ENGINE=InnoDB DEFAULT CHARSET=utf8 ROW_FORMAT=DYNAMIC |
      +-----------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      +----------------------+----------+-----------------------+--------------+-------------+
      | Status               | Duration | Source_function       | Source_file  | Source_line |
      +----------------------+----------+-----------------------+--------------+-------------+
      | starting             | 0.000084 | NULL                  | NULL         |        NULL |
      | checking permissions | 0.000041 | check_access          | sql_parse.cc |        6154 |
      | Opening tables       | 0.000036 | open_tables           | sql_base.cc  |        4532 |
      | After opening tables | 0.000044 | open_tables           | sql_base.cc  |        4779 |
      | closing tables       | 0.000042 | close_thread_tables   | sql_base.cc  |         919 |
      | query end            | 0.000025 | mysql_execute_command | sql_parse.cc |        5706 |
      | closing tables       | 0.000024 | close_thread_tables   | sql_base.cc  |         919 |
      | freeing items        | 0.000030 | mysql_parse           | sql_parse.cc |        7466 |
      | updating status      | 0.000034 | dispatch_command      | sql_parse.cc |        1954 |
      | cleaning up          | 0.000037 | dispatch_command      | sql_parse.cc |        1973 |
      +----------------------+----------+-----------------------+--------------+-------------+
      +-----------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | Table     | Create Table                                                                                                                                                                                                |
      +-----------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | date_time | CREATE TABLE `date_time` (
        `date` int(10) unsigned NOT NULL DEFAULT '0',
        `name` varchar(255) NOT NULL DEFAULT 'unknown',
        PRIMARY KEY (`name`)
      ) ENGINE=InnoDB DEFAULT CHARSET=utf8 ROW_FORMAT=DYNAMIC |
      +-----------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      +----------------------+----------+-----------------------+--------------+-------------+
      | Status               | Duration | Source_function       | Source_file  | Source_line |
      +----------------------+----------+-----------------------+--------------+-------------+
      | starting             | 0.000039 | NULL                  | NULL         |        NULL |
      | checking permissions | 0.000025 | check_access          | sql_parse.cc |        6154 |
      | Opening tables       | 0.000027 | open_tables           | sql_base.cc  |        4532 |
      | After opening tables | 1.100046 | open_tables           | sql_base.cc  |        4779 |
      | closing tables       | 0.000155 | close_thread_tables   | sql_base.cc  |         919 |
      | query end            | 0.000103 | mysql_execute_command | sql_parse.cc |        5706 |
      | closing tables       | 0.000060 | close_thread_tables   | sql_base.cc  |         919 |
      | freeing items        | 0.000051 | mysql_parse           | sql_parse.cc |        7466 |
      | updating status      | 0.000072 | dispatch_command      | sql_parse.cc |        1954 |
      | cleaning up          | 0.000068 | dispatch_command      | sql_parse.cc |        1973 |
      +----------------------+----------+-----------------------+--------------+-------------+
      +-----------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | Table     | Create Table                                                                                                                                                                                                |
      +-----------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | date_time | CREATE TABLE `date_time` (
        `date` int(10) unsigned NOT NULL DEFAULT '0',
        `name` varchar(255) NOT NULL DEFAULT 'unknown',
        PRIMARY KEY (`name`)
      ) ENGINE=InnoDB DEFAULT CHARSET=utf8 ROW_FORMAT=DYNAMIC |
      +-----------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      +----------------------+----------+-----------------------+--------------+-------------+
      | Status               | Duration | Source_function       | Source_file  | Source_line |
      +----------------------+----------+-----------------------+--------------+-------------+
      | starting             | 0.000090 | NULL                  | NULL         |        NULL |
      | checking permissions | 0.000047 | check_access          | sql_parse.cc |        6154 |
      | Opening tables       | 0.000043 | open_tables           | sql_base.cc  |        4532 |
      | After opening tables | 0.084826 | open_tables           | sql_base.cc  |        4779 |
      | closing tables       | 0.000127 | close_thread_tables   | sql_base.cc  |         919 |
      | query end            | 0.000054 | mysql_execute_command | sql_parse.cc |        5706 |
      | closing tables       | 0.000041 | close_thread_tables   | sql_base.cc  |         919 |
      | freeing items        | 0.000036 | mysql_parse           | sql_parse.cc |        7466 |
      | updating status      | 0.000066 | dispatch_command      | sql_parse.cc |        1954 |
      | cleaning up          | 0.000053 | dispatch_command      | sql_parse.cc |        1973 |
      +----------------------+----------+-----------------------+--------------+-------------+
      +-----------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | Table     | Create Table                                                                                                                                                                                                |
      +-----------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      | date_time | CREATE TABLE `date_time` (
        `date` int(10) unsigned NOT NULL DEFAULT '0',
        `name` varchar(255) NOT NULL DEFAULT 'unknown',
        PRIMARY KEY (`name`)
      ) ENGINE=InnoDB DEFAULT CHARSET=utf8 ROW_FORMAT=DYNAMIC |
      +-----------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      +----------------------+----------+-----------------------+--------------+-------------+
      | Status               | Duration | Source_function       | Source_file  | Source_line |
      +----------------------+----------+-----------------------+--------------+-------------+
      | starting             | 0.000356 | NULL                  | NULL         |        NULL |
      | checking permissions | 0.000059 | check_access          | sql_parse.cc |        6154 |
      | Opening tables       | 0.000050 | open_tables           | sql_base.cc  |        4532 |
      | After opening tables | 0.000103 | open_tables           | sql_base.cc  |        4779 |
      | closing tables       | 0.000048 | close_thread_tables   | sql_base.cc  |         919 |
      | query end            | 0.000039 | mysql_execute_command | sql_parse.cc |        5706 |
      | closing tables       | 0.000039 | close_thread_tables   | sql_base.cc  |         919 |
      | freeing items        | 0.000043 | mysql_parse           | sql_parse.cc |        7466 |
      | updating status      | 0.000054 | dispatch_command      | sql_parse.cc |        1954 |
      | cleaning up          | 0.000050 | dispatch_command      | sql_parse.cc |        1973 |
      +----------------------+----------+-----------------------+--------------+-------------+
      --------------
      mysql  Ver 15.1 Distrib 10.1.37-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2
       
      Connection id:          3742892
      Current database:
      Current user:           user@10.10.8.36
      SSL:                    Not in use
      Current pager:          stdout
      Using outfile:          ''
      Using delimiter:        ;
      Server:                 MariaDB
      Server version:         10.1.34-MariaDB MariaDB Server
      Protocol version:       10
      Connection:             server via TCP/IP
      Server characterset:    utf8
      Db     characterset:    utf8
      Client characterset:    utf8
      Conn.  characterset:    utf8
      TCP port:               3306
      Uptime:                 42 min 35 sec
       
      Threads: 462  Questions: 56002787  Slow queries: 0  Opens: 8070  Flush tables: 1  Open tables: 2033  Queries per second avg: 21918.899
      --------------
      

      One of 'show create' locks on 1 seconds (10.1.34-NN - files with results of serveral script calling):

      # egrep 'After|unlock|Uptime'  10.1.34-*
      10.1.34-82:| After opening tables | 0.000033 | open_tables           | sql_base.cc  |        4779 |
      10.1.34-82:| Unlocking tables     | 1.117436 | mysql_unlock_tables   | lock.cc      |         396 |
      10.1.34-82:Uptime:                      41 min 35 sec
      10.1.34-82:| After opening tables | 0.000035 | open_tables           | sql_base.cc  |        4779 |
      10.1.34-82:| After opening tables | 0.000029 | open_tables           | sql_base.cc  |        4779 |
      10.1.34-82:| After opening tables | 0.000051 | open_tables           | sql_base.cc  |        4779 |
      10.1.34-82:| After opening tables | 1.113856 | open_tables           | sql_base.cc  |        4779 |
      10.1.34-82:Uptime:                      41 min 35 sec
       
      10.1.34-83:| After opening tables | 0.000039 | open_tables           | sql_base.cc  |        4779 |
      10.1.34-83:| Unlocking tables     | 1.100278 | mysql_unlock_tables   | lock.cc      |         396 |
      10.1.34-83:Uptime:                      42 min 5 sec
      10.1.34-83:| After opening tables | 1.098836 | open_tables           | sql_base.cc  |        4779 |
      10.1.34-83:| After opening tables | 0.089455 | open_tables           | sql_base.cc  |        4779 |
      10.1.34-83:| After opening tables | 0.000078 | open_tables           | sql_base.cc  |        4779 |
      10.1.34-83:| After opening tables | 0.000076 | open_tables           | sql_base.cc  |        4779 |
      10.1.34-83:Uptime:                      42 min 5 sec
       
      10.1.34-84:| After opening tables | 0.000024 | open_tables           | sql_base.cc  |        4779 |
      10.1.34-84:| Unlocking tables     | 1.101685 | mysql_unlock_tables   | lock.cc      |         396 |
      10.1.34-84:Uptime:                      42 min 35 sec
      10.1.34-84:| After opening tables | 0.000044 | open_tables           | sql_base.cc  |        4779 |
      10.1.34-84:| After opening tables | 1.100046 | open_tables           | sql_base.cc  |        4779 |
      10.1.34-84:| After opening tables | 0.084826 | open_tables           | sql_base.cc  |        4779 |
      10.1.34-84:| After opening tables | 0.000103 | open_tables           | sql_base.cc  |        4779 |
      10.1.34-84:Uptime:                      42 min 35 sec
      

      On version 10.1.33 max time not so high:

      10.1.33-96:| After opening tables | 0.000024 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-96:| Unlocking tables     | 0.131976 | mysql_unlock_tables   | lock.cc      |         396 |
      10.1.33-96:Uptime:                      49 min 35 sec
      10.1.33-96:| After opening tables | 0.000038 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-96:| After opening tables | 0.032584 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-96:| After opening tables | 0.000044 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-96:| After opening tables | 0.000038 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-96:Uptime:                      49 min 34 sec
      10.1.33-97:| After opening tables | 0.000022 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-97:| Unlocking tables     | 0.035330 | mysql_unlock_tables   | lock.cc      |         396 |
      10.1.33-97:Uptime:                      50 min 1 sec
      10.1.33-97:| After opening tables | 0.000051 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-97:| After opening tables | 0.027047 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-97:| After opening tables | 0.000030 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-97:| After opening tables | 0.000044 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-97:Uptime:                      50 min 1 sec
      10.1.33-98:| After opening tables | 0.000023 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-98:| Unlocking tables     | 0.141847 | mysql_unlock_tables   | lock.cc      |         396 |
      10.1.33-98:Uptime:                      50 min 27 sec
      10.1.33-98:| After opening tables | 0.000040 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-98:| After opening tables | 0.031896 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-98:| After opening tables | 0.000036 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-98:| After opening tables | 0.000063 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-98:Uptime:                      50 min 27 sec
      10.1.33-99:| After opening tables | 0.000041 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-99:| Unlocking tables     | 0.042536 | mysql_unlock_tables   | lock.cc      |         396 |
      10.1.33-99:Uptime:                      50 min 54 sec
      10.1.33-99:| After opening tables | 0.000045 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-99:| After opening tables | 0.000040 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-99:| After opening tables | 0.000039 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-99:| After opening tables | 0.000033 | open_tables           | sql_base.cc  |        4769 |
      10.1.33-99:Uptime:                      50 min 55 sec
      

      MariaDB [search]> show table status like 'company_search_summary_table'\G
      *************************** 1. row ***************************
                 Name: company_search_summary_table
               Engine: InnoDB
              Version: 10
           Row_format: Compact
                 Rows: 267016
       Avg_row_length: 332
          Data_length: 88719360
      Max_data_length: 0
         Index_length: 0
            Data_free: 6291456
       Auto_increment: NULL
          Create_time: 2019-05-22 16:21:40
          Update_time: NULL
           Check_time: NULL
            Collation: utf8_general_ci
             Checksum: NULL
       Create_options: 
              Comment: 
      

      This server has 140G buffer pool, on out main server with buffer pool 400G locks duration more than 3 seconds.

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              Assignee:
              marko Marko Mäkelä
              Reporter:
              chernomorets Sergey Chernomorets
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              2 Vote for this issue
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              7 Start watching this issue

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                Created:
                Updated:
                Resolved:

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