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| author | Robert Haas | 2022-03-29 13:24:24 +0000 |
|---|---|---|
| committer | Robert Haas | 2022-03-29 13:24:24 +0000 |
| commit | edea649afbcedd431802a5255cd153538e43ee1d (patch) | |
| tree | edcaf9f189131feb5564f52d2416f281393ee6e9 | |
| parent | 3785d8e98b741749d09f1cfe119ec04961ed07b2 (diff) | |
Explain why the startup process can't cause a shortage of sinval slots.
Bharath Rupireddy, reviewed by Fujii Masao and Yura Sokolov.
Lightly edited by me.
Discussion: http://postgr.es/m/CALj2ACU=3_frMkDp9UUeuZoAMjaK1y0Z_q5RFNbGvwi8NM==AA@mail.gmail.com
| -rw-r--r-- | src/backend/storage/ipc/sinvaladt.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/backend/storage/ipc/sinvaladt.c b/src/backend/storage/ipc/sinvaladt.c index 68e7160b30..2dec668bbc 100644 --- a/src/backend/storage/ipc/sinvaladt.c +++ b/src/backend/storage/ipc/sinvaladt.c @@ -205,6 +205,14 @@ SInvalShmemSize(void) Size size; size = offsetof(SISeg, procState); + + /* + * In Hot Standby mode, the startup process requests a procState array + * slot using InitRecoveryTransactionEnvironment(). Even though MaxBackends + * doesn't account for the startup process, it is guaranteed to get a + * free slot. This is because the autovacuum launcher and worker processes, + * which are included in MaxBackends, are not started in Hot Standby mode. + */ size = add_size(size, mul_size(sizeof(ProcState), GetMaxBackends())); return size; |