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)
  - The error occurred while processing error message returned from backend and the cause is that the query string in question is too big. Problem is, the buffer is in fixed size (8192 bytes). Eliminate the fixed size buffer and use palloced buffer instead. This also saves some memory copy work.
  - Fix DROP DATABASE failure. (Tatsuo Ishii)
  - Fix wrong variable in read_status_file() function. (bug 493) (Takuma Hoshiai)
  - Fix compiler warnings. (Tatsuo Ishii)