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Fix parallel index builds for dynamic_shared_memory_type=none.

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The previous code failed to realize that this setting effectively
disables parallelism, and would crash if it decided to attempt
parallelism anyway.  Instead, treat it as a disabling condition.

Kyotaro Horiguchi, who also reported the issue. Reviewed by Michael
Paquier and Peter Geoghegan.

Discussion: http://postgr.es/m/20180209.170635.256350357.horiguchi.kyotaro@lab.ntt.co.jp
This commit is contained in:
Robert Haas 2018-02-12 12:55:12 -05:00
parent 80f021ef13
commit 88ef48c1cc
1 changed files with 2 additions and 1 deletions
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3
src/backend/optimizer/plan/planner.c
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@ -5825,7 +5825,8 @@ plan_create_index_workers(Oid tableOid, Oid indexOid)
double allvisfrac;
/* Return immediately when parallelism disabled */
if (max_parallel_maintenance_workers == 0)
if (dynamic_shared_memory_type == DSM_IMPL_NONE ||
max_parallel_maintenance_workers == 0)
return 0;
/* Set up largely-dummy planner state */