Commits on May 17, 2024

1. Added ability to gracefully interrupt application in both fetch and p… …

   …ull modes
   
   Added custom signal handlers for SIGINT and SIGTERM that set global flag
   ('std::atomic_flag global_termination_flag' ).
   
   Added extra logic that checks for a termination request in the following locations.
   * Inside receiving / processing individual binlog events loop in 'receive_binlog_events()'.
   * In the 'pull' mode idle-reconnection loop.
   * Inside the idle time sleep function.
   
   From the user point of view the application can now be gracefully shut down when user presses 'Ctrl+C' or kills the application by SIGTERM (e.g. 'kill <binlog_server_pid>').
   "Gracefully " means that all the connections will be properly closed, data caches written to disk / uploaded to the cloud and storage will remain in consistent / resumable state.
   
   Because of the synchronous nature of the binlog functions from the MySQL client library, there still may be a delay between receiving the signal and reacting to it. Worst case scenario, user will have to wait '<connection.read_timeout>' (the value from the configuration) + 1 second (the granularity of sleep intervals in the 'idle' mode).

   

   percona-ysorokin committed May 17, 2024
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