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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

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      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)
      

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              Assignee:
              ycp Yuchen Pei
              Reporter:
              Roel Roel Van de Paar
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                Updated:

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