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  1. MariaDB Server
  2. MDEV-29676

Dual thread hang in 'closing tables' and 'Waiting for table metadata lock' on Spider CREATE OR REPLACE TABLE

Details

    Description

      Please change socket file location as required. Use CLI for replay, or MTR testcase (ref comment below). Use branch bb-10.11-midenok-MDEV-25292 (atm).

      INSTALL PLUGIN Spider SONAME 'ha_spider.so';
      		 
      CREATE USER Spider@localhost IDENTIFIED BY 'PWD1';
      		 
      CREATE SERVER srv FOREIGN DATA WRAPPER MYSQL OPTIONS (SOCKET '../socket.sock',DATABASE 'test',user 'Spider',PASSWORD 'PWD1');
      		 
      CREATE TABLE t (c INT) ENGINE=Spider COMMENT='WRAPPER "mysql",srv "srv",TABLE "t"';
      		 
      CREATE OR REPLACE TABLE t (c INT) ENGINE=Spider;

      Will make 10.11 (opt+dbg) hang with:

      10.11.0 49cee4e21a8e3cc0eccff3a6f9e493247344e24f (Optimized)

      		 
      10.11.0-opt>SHOW FULL PROCESSLIST;
      		 
      +----+-------------+-----------+------+---------+------+----------------------------------------------------+-------------------------------------------------+----------+
      		 
      | Id | User        | Host      | db   | Command | Time | State                                              | Info                                            | Progress |
      		 
      +----+-------------+-----------+------+---------+------+----------------------------------------------------+-------------------------------------------------+----------+
      		 
      |  4 | root        | localhost | test | Query   |  303 | closing tables                                     | CREATE OR REPLACE TABLE t (c INT) ENGINE=Spider |    0.000 |
      		 
      |  5 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                            |    0.000 |
      		 
      |  6 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                            |    0.000 |
      		 
      |  7 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                            |    0.000 |
      		 
      |  8 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL                                            |    0.000 |
      		 
      |  9 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                            |    0.000 |
      		 
      | 11 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                            |    0.000 |
      		 
      | 12 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL                                            |    0.000 |
      		 
      | 13 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                            |    0.000 |
      		 
      | 14 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                            |    0.000 |
      		 
      | 15 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL                                            |    0.000 |
      		 
      | 16 | system user |           | NULL | Sleep   |  303 | Reset for next command                             | NULL                                            |    0.000 |
      		 
      | 17 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL                                            |    0.000 |
      		 
      | 19 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL                                            |    0.000 |
      		 
      | 20 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL                                            |    0.000 |
      		 
      | 18 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL                                            |    0.000 |
      		 
      | 10 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL                                            |    0.000 |
      		 
      | 22 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                            |    0.000 |
      		 
      | 21 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                            |    0.000 |
      		 
      | 23 | system user |           | NULL | Daemon  | NULL | Spider table background statistics action handler  | NULL                                            |    0.000 |
      		 
      | 24 | system user |           | NULL | Daemon  | NULL | Spider table background cardinality action handler | NULL                                            |    0.000 |
      		 
      | 25 | Spider      | localhost | test | Query   |  303 | Waiting for table metadata lock                    | show table status from `test` like 't'          |    0.000 |
      		 
      | 26 | root        | localhost | test | Query   |    0 | starting                                           | SHOW FULL PROCESSLIST                           |    0.000 |
      		 
      +----+-------------+-----------+------+---------+------+----------------------------------------------------+-------------------------------------------------+----------+
      		 
      23 rows in set (0.000 sec)

      Attachments

        Issue Links

          blocks

          Task - A task that needs to be done. MDEV-31138 Enable the test spider/bugfix.mdev_29676 once MDEV-25292 is pushed

          • Critical - Crashes, loss of data, severe memory leak.
          • Open
          causes

          Bug - A problem which impairs or prevents the functions of the product. MDEV-31463 SIGSEGV in server_mysql_send_query | server_mysql_real_query

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-35073 -Wmaybe-uninitialized in result of spider_conn_first_link_idx

          • Major - Major loss of function.
          • Closed
          is caused by

          New Feature - A new feature of the product, which has yet to be developed. MDEV-25292 Atomic CREATE OR REPLACE TABLE

          • Critical - Crashes, loss of data, severe memory leak.
          • Stalled
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-29583 Disallow Spider self/dual/multi/cross-referencing tables, consider not executing/skipping/disabling init_connect for Spider user

          • Major - Major loss of function.
          • Closed

          Task - A task that needs to be done. MDEV-30580 Investigate whether self-/multi- referencing spider tables cause problems

          • Major - Major loss of function.
          • Open

          Task - A task that needs to be done. MDEV-30994 Earlier detection of spider table self-reference

          • Major - Major loss of function.
          • Open

          Activity

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              ycp Yuchen Pei
              Roel Roel Van de Paar
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                Created:
                Updated:
                Resolved:

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