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Add background worker type

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Add bgw_type field to background worker structure.  It is intended to be
set to the same value for all workers of the same type, so they can be
grouped in pg_stat_activity, for example.

The backend_type column in pg_stat_activity now shows bgw_type for a
background worker.  The ps listing also no longer calls out that a
process is a background worker but just show the bgw_type.  That way,
being a background worker is more of an implementation detail now that
is not shown to the user.  However, most log messages still refer to
'background worker "%s"'; otherwise constructing sensible and
translatable log messages would become tricky.

Reviewed-by: Michael Paquier <michael.paquier@gmail.com>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
This commit is contained in:
Peter Eisentraut
2017-08-31 12:24:47 -04:00
parent 8b304b8b72
commit 5373bc2a08
10 changed files with 89 additions and 16 deletions
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3
src/backend/replication/logical/launcher.c
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@ -422,6 +422,7 @@ retry:
else
snprintf(bgw.bgw_name, BGW_MAXLEN,
"logical replication worker for subscription %u", subid);
snprintf(bgw.bgw_type, BGW_MAXLEN, "logical replication worker");
bgw.bgw_restart_time = BGW_NEVER_RESTART;
bgw.bgw_notify_pid = MyProcPid;
@ -775,6 +776,8 @@ ApplyLauncherRegister(void)
snprintf(bgw.bgw_function_name, BGW_MAXLEN, "ApplyLauncherMain");
snprintf(bgw.bgw_name, BGW_MAXLEN,
"logical replication launcher");
snprintf(bgw.bgw_type, BGW_MAXLEN,
"logical replication launcher");
bgw.bgw_restart_time = 5;
bgw.bgw_notify_pid = 0;
bgw.bgw_main_arg = (Datum) 0;