Enhancements

  - Speed up failover when all of backends are down. (Tatsuo Ishii)
  - pgpool-recovery extension and pgpool_setup is now ready for the next major release PostgreSQL 12. (Tatsuo Ishii)

Bug fixes

  - Fix the wrong error message "ERROR: connection cache is full", when all backend nodes are down. (bug 487) (Bo Peng)
  - Avoid exit/fork storm of pool_worker_child process. (Tatsuo Ishii)
  - Fix black_function_list's broken default value. (Tatsuo Ishii)
  - Fix "not enough space in buffer" error. (bug 499) (Tatsuo Ishii)
  - Fix DROP DATABASE failure. (Tatsuo Ishii)
  - Fix wrong variable in read_status_file() function. (bug 493) (Takuma Hoshiai)
  - Abort session if failover/failback is ongoing to prevent potential segfault. (bug 481, bug 482) (Tatsuo Ishii)
  - Fix compiler warnings. (Tatsuo Ishii)
  - Fix memory leak in "batch" mode in extended query. (bug 468) (Tatsuo Ishii)