Limit checkpointer requests queue size If the number of sync requests is big enough, the palloc() call in AbsorbSyncRequests() will attempt to allocate more than 1 GB of memory, resulting in failure. This can lead to an infinite loop in the checkpointer process, as it repeatedly fails to absorb the pending requests.
This commit limits the checkpointer requests queue size to 10M items. In addition to preventing the palloc() failure, this change helps to avoid long queue processing time. Also, this commit is for backpathing only. The master branch receives a more invasive yet comprehensive fix for this problem. Discussion: https://postgr.es/m/db4534f83a22a29ab5ee2566ad86ca92%40postgrespro.ru Backpatch-through: 13 Branch ------ REL_15_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/b248a3ba4e51328f6289c28b30d5145bdde0a937 Modified Files -------------- src/backend/postmaster/checkpointer.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
