On 5/3/20 7:28 AM, Abraham, Danny wrote:
Is there a way to eliminate postmaster crash/core ?
A surge in short-term connections eventually crashes PG on "no free slots in
PMChildFlags array".
Happens on AIX 7.2
=>grep "2020-05-02 08:16" * | grep clients | wc -l
0
=>grep "2020-05-02 08:17" * | grep clients | wc -l
0
=>grep "2020-05-02 08:18" * | grep clients | wc -l
309
=>grep "2020-05-02 08:19" * | grep clients | wc -l
603
=>grep "2020-05-02 08:20" * | grep clients | wc -l
288
=>grep "2020-05-02 08:21" * | grep clients | wc -l
230
2020-05-02 08:21:27.653 CDTFATAL: no free slots in PMChildFlags array
Well:
backend/storage/ipc/pmsignal.c
/* Out of slots ... should never happen, else postmaster.c messed up */
elog(FATAL, "no free slots in PMChildFlags array");
return 0; /* keep
compiler quiet */
So:
1) What are your connection settings?
2) What is generating the client traffic?
3) Is there a pooler in front of the server?
--
Adrian Klaver
adrian.kla...@aklaver.com
