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Add parallel_leader_participation GUC.

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Sometimes, for testing, it's useful to have the leader do nothing but
read tuples from workers; and it's possible that could work out better
even in production.

Thomas Munro, reviewed by Amit Kapila and by me.  A few final tweaks
by me.

Discussion: http://postgr.es/m/CAEepm=2U++Lp3bNTv2Bv_kkr5NE2pOyHhxU=G0YTa4ZhSYhHiw@mail.gmail.com
This commit is contained in:
Robert Haas
2017-11-15 08:17:29 -05:00
parent 7518049980
commit e5253fdc4f
10 changed files with 205 additions and 9 deletions
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10
src/backend/utils/misc/guc.c
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@ -1676,6 +1676,16 @@ static struct config_bool ConfigureNamesBool[] =
NULL, NULL, NULL
},
{
{"parallel_leader_participation", PGC_USERSET, RESOURCES_ASYNCHRONOUS,
gettext_noop("Controls whether Gather and Gather Merge also run subplans."),
gettext_noop("Should gather nodes also run subplans, or just gather tuples?")
},
&parallel_leader_participation,
true,
NULL, NULL, NULL
},
/* End-of-list marker */
{
{NULL, 0, 0, NULL, NULL}, NULL, false, NULL, NULL, NULL