diff options
| author | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2020-03-27 16:04:52 -0300 |
|---|---|---|
| committer | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2020-03-27 16:20:33 -0300 |
| commit | 092c6936de49effe63daad94855bcd8ef26a09dd (patch) | |
| tree | 301494253f5a9a51254073617ed0d81199f3627b /src/include/replication/walreceiver.h | |
| parent | fbc7a716084ebccd2a996cc415187c269ea54b3e (diff) | |
Set wal_receiver_create_temp_slot PGC_POSTMASTER
Commit 329730827848 gave walreceiver the ability to create and use a
temporary replication slot, and made it controllable by a GUC (enabled
by default) that can be changed with SIGHUP. That's useful but has two
problems: one, it's possible to cause the origin server to fill its disk
if the slot doesn't advance in time; and also there's a disconnect
between state passed down via the startup process and GUCs that
walreceiver reads directly.
We handle the first problem by setting the option to disabled by
default. If the user enables it, its on their head to make sure that
disk doesn't fill up.
We handle the second problem by passing the flag via startup rather than
having walreceiver acquire it directly, and making it PGC_POSTMASTER
(which ensures a walreceiver always has the fresh value). A future
commit can relax this (to PGC_SIGHUP again) by having the startup
process signal walreceiver to shutdown whenever the value changes.
Author: Sergei Kornilov <sk@zsrv.org>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Álvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/20200122055510.GH174860@paquier.xyz
Diffstat (limited to 'src/include/replication/walreceiver.h')
| -rw-r--r-- | src/include/replication/walreceiver.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/include/replication/walreceiver.h b/src/include/replication/walreceiver.h index e08afc6548f..cf3e43128c7 100644 --- a/src/include/replication/walreceiver.h +++ b/src/include/replication/walreceiver.h @@ -23,7 +23,6 @@ #include "utils/tuplestore.h" /* user-settable parameters */ -extern bool wal_receiver_create_temp_slot; extern int wal_receiver_status_interval; extern int wal_receiver_timeout; extern bool hot_standby_feedback; @@ -321,7 +320,8 @@ extern void ShutdownWalRcv(void); extern bool WalRcvStreaming(void); extern bool WalRcvRunning(void); extern void RequestXLogStreaming(TimeLineID tli, XLogRecPtr recptr, - const char *conninfo, const char *slotname); + const char *conninfo, const char *slotname, + bool create_temp_slot); extern XLogRecPtr GetWalRcvWriteRecPtr(XLogRecPtr *latestChunkStart, TimeLineID *receiveTLI); extern int GetReplicationApplyDelay(void); extern int GetReplicationTransferLatency(void); |