rpl_debug_points.h

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/* Copyright (c) 2019, 2026, Oracle and/or its affiliates.
 
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   it under the terms of the GNU General Public License, version 2.0,
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/*****************************************************************************
Replication debug wait points
 
This file contains methods used to decrease pollution in replication code
Instead of inserting a entire block
 
   DBUG_EXECUTE_IF(rpl_replica_debug_point
 
    now SIGNAL this
 
    WAIT_FOR that
 
you can simply do
 
  DBUG_EXECUTE_IF("rpl_replica_debug_point", {rpl_replica_debug();});
 
The ideas is to have a method per file/context, like slave, master, gtid, etc
 
*****************************************************************************/
 
#ifndef RPL_DEBUG_POINTS_H
#define RPL_DEBUG_POINTS_H
 
#ifndef NDEBUG
 
#include "my_dbug.h"
 
enum enum_rpl_replica_debug_point {
  /** stop_replica_dont_release_backup_lock */
  DBUG_RPL_S_STOP_SLAVE_BACKUP_LOCK = 0,
 
  /** pause_after_queue_event */
  DBUG_RPL_S_PAUSE_QUEUE_EV,
 
  /** simulate_io_thd_wait_for_disk_space */
  DBUG_RPL_S_IO_WAIT_FOR_SPACE,
 
  /** dbug.before_get_SOURCE_UUID */
  DBUG_RPL_S_BEFORE_MASTER_UUID,
 
  /** dbug.simulate_busy_io */
  DBUG_RPL_S_SIMULATE_BUSY_IO,
 
  /** dbug.before_get_UNIX_TIMESTAMP */
  DBUG_RPL_S_BEFORE_UNIX_TIMESTAMP,
 
  /** dbug.before_get_SERVER_ID */
  DBUG_RPL_S_BEFORE_SERVER_ID,
 
  /** rpl_before_forced_rotate */
  DBUG_RPL_S_BEFORE_FORCED_ROTATE,
 
  /** calculate_sbm_after_previous_gtid_log_event */
  DBUG_RPL_S_SBM_AFTER_PREVIOUS_GTID_EV,
 
  /** calculate_sbm_after_fake_rotate_log_event */
  DBUG_RPL_S_SBM_AFTER_FAKE_ROTATE_EV,
 
  /** rpl_ps_tables_worker_retry */
  DBUG_RPL_S_PS_TABLE_WORKER_RETRY,
 
  /** before_get_running_status_yes */
  DBUG_RPL_S_BEFORE_RUNNING_STATUS,
 
  /** rpl_ps_tables_queue */
  DBUG_RPL_S_PS_TABLE_QUEUE,
 
  /** rpl_ps_tables */
  DBUG_RPL_S_PS_TABLES,
 
  /** pause_after_queue_event */
  DBUG_RPL_S_PAUSE_AFTER_QUEUE_EV,
 
  /** flush_after_reading_user_var_event */
  DBUG_RPL_S_FLUSH_AFTER_USERV_EV,
 
  /** pause_after_io_thread_stop_hook */
  DBUG_RPL_S_PAUSE_AFTER_IO_STOP,
 
  /** mta_checkpoint - start */
  DBUG_RPL_S_MTS_CHECKPOINT_START,
 
  /** mta_checkpoint - end */
  DBUG_RPL_S_MTS_CHECKPOINT_END,
 
  /** pause_after_sql_thread_stop_hook */
  DBUG_RPL_S_AFTER_SQL_STOP,
 
  /** pause_on_queuing_event */
  DBUG_RPL_S_PAUSE_QUEUING,
 
  /** reached_heart_beat_queue_event */
  DBUG_RPL_S_HEARTBEAT_EV,
 
  /** handle_slave_io */
  DBUG_RPL_S_RETRY_COUNT_EXCEED,
 
  /** Pause on a replica thread stop after aweking the THD */
  DBUG_RPL_R_WAIT_AFTER_AWAKE_ON_THREAD_STOP
};
 
/**
  Method used to decrease code pollution in slave methods
*/
void rpl_replica_debug_point(enum_rpl_replica_debug_point point_id,
                             THD *thd = nullptr) {
  if (!thd) thd = current_thd;
 
  std::string debug_point_string{""};
 
  switch (point_id) {
    /* stop_slave_cmd */
    case DBUG_RPL_S_STOP_SLAVE_BACKUP_LOCK: {
      debug_point_string.assign(
          "now SIGNAL replica_acquired_backup_lock WAIT_FOR "
          "tried_to_lock_instance_for_backup");
      break;
    }
    /* terminate_slave_threads */
    case DBUG_RPL_S_PAUSE_QUEUE_EV: {
      debug_point_string.assign("now SIGNAL reached_stopping_io_thread");
      break;
    }
    /* terminate_slave_threads */
    case DBUG_RPL_S_IO_WAIT_FOR_SPACE: {
      debug_point_string.assign("now SIGNAL reached_stopping_io_thread");
      break;
    }
    /* get_master_uuid */
    case DBUG_RPL_S_BEFORE_MASTER_UUID: {
      debug_point_string.assign("now wait_for signal.get_source_uuid");
      break;
    }
    /* get_master_uuid */
    case DBUG_RPL_S_SIMULATE_BUSY_IO: {
      debug_point_string.assign(
          "now signal Reached wait_for signal.got_stop_replica");
      break;
    }
    /* get_master_version_and_clock */
    case DBUG_RPL_S_BEFORE_UNIX_TIMESTAMP: {
      debug_point_string.assign("now wait_for signal.get_unix_timestamp");
      break;
    }
    /* get_master_version_and_clock */
    case DBUG_RPL_S_BEFORE_SERVER_ID: {
      debug_point_string.assign("now wait_for signal.get_server_id");
      break;
    }
    /* wait_for_relay_log_space */
    case DBUG_RPL_S_BEFORE_FORCED_ROTATE: {
      debug_point_string.assign(
          "now SIGNAL signal.rpl_before_forced_rotate_reached WAIT_FOR "
          "signal.rpl_before_forced_rotate_continue");
      break;
    }
    /* exec_relay_log_event */
    case DBUG_RPL_S_SBM_AFTER_PREVIOUS_GTID_EV: {
      debug_point_string.assign(
          "now signal signal.reached wait_for signal.done_sbm_calculation");
      break;
    }
    /* exec_relay_log_event */
    case DBUG_RPL_S_SBM_AFTER_FAKE_ROTATE_EV: {
      debug_point_string.assign(
          "now signal signal.reached wait_for signal.done_sbm_calculation");
      break;
    }
    /* exec_relay_log_event */
    case DBUG_RPL_S_PS_TABLE_WORKER_RETRY: {
      debug_point_string.assign(
          "now SIGNAL signal.rpl_ps_tables_worker_retry_pause WAIT_FOR "
          "signal.rpl_ps_tables_worker_retry_continue");
      break;
    }
    /* handle_slave_io */
    case DBUG_RPL_S_BEFORE_RUNNING_STATUS: {
      debug_point_string.assign("now wait_for signal.io_thread_let_running");
      break;
    }
    /* handle_slave_io */
    case DBUG_RPL_S_PS_TABLE_QUEUE: {
      debug_point_string.assign(
          "now SIGNAL signal.rpl_ps_tables_queue_before WAIT_FOR "
          "signal.rpl_ps_tables_queue_finish");
      break;
    }
    /* handle_slave_io */
    case DBUG_RPL_S_PS_TABLES: {
      debug_point_string.assign(
          "now SIGNAL signal.rpl_ps_tables_queue_after_finish WAIT_FOR "
          "signal.rpl_ps_tables_queue_continue");
      break;
    }
    /* handle_slave_io */
    case DBUG_RPL_S_PAUSE_AFTER_QUEUE_EV: {
      debug_point_string.assign(
          "now SIGNAL reached_after_queue_event WAIT_FOR "
          "continue_after_queue_event");
      break;
    }
    /* handle_slave_io */
    case DBUG_RPL_S_FLUSH_AFTER_USERV_EV: {
      debug_point_string.assign(
          "now signal Reached wait_for signal.flush_complete_continue");
      break;
    }
    /* handle_slave_io */
    case DBUG_RPL_S_PAUSE_AFTER_IO_STOP: {
      debug_point_string.assign(
          "now SIGNAL reached_stopping_io_thread WAIT_FOR "
          "continue_to_stop_io_thread");
      break;
    }
    /* mta_checkpoint_routine */
    case DBUG_RPL_S_MTS_CHECKPOINT_START: {
      debug_point_string.assign("now signal mta_checkpoint_start");
      break;
    }
    /* mta_checkpoint_routine */
    case DBUG_RPL_S_MTS_CHECKPOINT_END: {
      debug_point_string.assign("now signal mta_checkpoint_end");
      break;
    }
    /* handle_slave_sql */
    case DBUG_RPL_S_AFTER_SQL_STOP: {
      debug_point_string.assign(
          "now SIGNAL reached_stopping_sql_thread WAIT_FOR "
          "continue_to_stop_sql_thread");
      break;
    }
    /* queue_event */
    case DBUG_RPL_S_PAUSE_QUEUING: {
      debug_point_string.assign(
          "now SIGNAL reached_queuing_event WAIT_FOR continue_queuing_event");
      break;
    }
    /* queue_event */
    case DBUG_RPL_S_HEARTBEAT_EV: {
      debug_point_string.assign(
          "now SIGNAL check_replica_source_info WAIT_FOR proceed_write_rotate");
      break;
    }
    /* handle_slave_io */
    case DBUG_RPL_S_RETRY_COUNT_EXCEED: {
      debug_point_string.assign(
          "now SIGNAL wait_for_retry_count_exceed WAIT_FOR "
          "continue_retry_count_exceed");
      break;
    }
    /* terminate_slave_thread */
    case DBUG_RPL_R_WAIT_AFTER_AWAKE_ON_THREAD_STOP: {
      debug_point_string.assign("now signal signal.stop_point_after_awake");
      break;
    }
  }
 
  assert(!debug_point_string.empty());
  assert(!debug_sync_set_action(thd, debug_point_string.c_str(),
                                debug_point_string.length()));
}
 
#endif /* NDEBUG */
 
#endif /* RPL_DEBUG_POINTS_H */