mysql：设置innodb_force_recovery 导致无限loop

当数据库设置innodb_force_recovery 参数并且重启的时候，

alter日志里面会打出无限多的Waiting for the background threads to start

那是因为 设置innodb_force_recovery 导致无限loop

原因：

mysql 原代码的脚本：

innodb_purge_thread 默认值是1   

  while (srv_shutdown_state == SRV_SHUTDOWN_NONE) { 
      if (srv_thread_has_reserved_slot(SRV_MASTER) == ULINT_UNDEFINED 
          || (srv_n_purge_threads == 1 
          && srv_thread_has_reserved_slot(SRV_WORKER) 
          == ULINT_UNDEFINED)) { 

          ut_print_timestamp(stderr); 
          fprintf(stderr, "  InnoDB: " 
              "Waiting for the background threads to " 
              "start\n"); 
          os_thread_sleep(1000000); 
      } else { 
          break; 
      } 
  } 

 

 

解决的办法是 ：

在设置 innodb_force_recovery >2 的同时

也要加上：

innodb_purge_thread = 0

 

 

InnoDB: 1 transaction(s) which must be rolled back or cleaned up
InnoDB: in total 27581870 row operations to undo
InnoDB: Trx id counter is 14F00
130507 14:13:12  InnoDB: Starting an apply batch of log records to the database...
InnoDB: Progress in percents: 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55
 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
InnoDB: Apply batch completed
InnoDB: Last MySQL binlog file position 0 479663790, file name /opt/mysql/log/mysql-bin.000392
130507 14:13:17  InnoDB: Waiting for the background threads to start
130507 14:13:18  InnoDB: Waiting for the background threads to start
130507 14:13:19  InnoDB: Waiting for the background threads to start
130507 14:13:20  InnoDB: Waiting for the background threads to start
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