| From: | Tatsuo Ishii <ishii(at)postgresql(dot)org> |
|---|---|
| To: | masao(dot)fujii(at)gmail(dot)com |
| Cc: | magnus(at)hagander(dot)net, heikki(dot)linnakangas(at)enterprisedb(dot)com, itagaki(dot)takahiro(at)gmail(dot)com, tgl(at)sss(dot)pgh(dot)pa(dot)us, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: pg_ctl failover Re: Latches, signals, and waiting |
| Date: | 2011-01-31 03:35:47 |
| Message-ID: | 20110131.123547.671468322707979322.t-ishii@sraoss.co.jp |
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| Thread: | |
| Lists: | pgsql-hackers |
> If the "pg_ctl promote" patch will have been committed, I recommend that
> the C function should send the signal to the startup process rather than
> creating the trigger file. Because the trigger file is checked every for 5s,
> which would lengthen the failover time by an average 2.5s.
Ok, probably I could make the function smart enough to signal or not
by looking at the PostgreSQL version.
BTW is it possible to export following variable in xlog.c?
static char *TriggerFile = NULL;
That would make coding of the C function lot easier.
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese: http://www.sraoss.co.jp
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