On Mon, May 17, 2010 at 10:20 PM, Robert Haas <robertmhaas@gmail.com> wrote:
> OK, I think I understand now. But, the SIGTERM sent by the postmaster
> doesn't kill the recovery process unconditionally. It will invoke
> StartupProcShutdownHandler(), which will set set shutdown_requested =
> true. That gets checked by RestoreArchivedFile() and
> HandleStartupProcInterrupts(), and I think that neither of those can
> get invoked until after the control file has been updated. Do you see
> a way it can happen?
Yeah, the way is:
StartupXLOG() --> ReadCheckpointRecord() --> ReadRecord() -->
XLogPageRead() --> XLogFileReadAnyTLI() --> XLogFileRead() -->
RestoreArchivedFile()
ReadCheckpointRecord() is called before pg_control is updated.
ISTM that walreceiver might be invoked even after shutdown is requested.
We should prevent the postmaster from starting up walreceiver if
Shutdown > NoShutdown?
Regards,
--
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center
