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In HS, Startup process sets SIGALRM when waiting for buffer pin. If

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woken by alarm we send SIGUSR1 to all backends requesting that they
check to see if they are blocking Startup process. If so, they throw
ERROR/FATAL as for other conflict resolutions. Deadlock stop gap
removed. max_standby_delay = -1 option removed to prevent deadlock.
This commit is contained in:
Simon Riggs
2010-01-23 16:37:12 +00:00
parent 4fa69e566c
commit 959ac58c04
16 changed files with 367 additions and 87 deletions
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11
src/backend/access/transam/xlog.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.359 2010/01/20 19:43:40 heikki Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.360 2010/01/23 16:37:12 sriggs Exp $
*
*-------------------------------------------------------------------------
*/
@ -8803,9 +8803,12 @@ StartupProcessMain(void)
*/
pqsignal(SIGHUP, StartupProcSigHupHandler); /* reload config file */
pqsignal(SIGINT, SIG_IGN); /* ignore query cancel */
pqsignal(SIGTERM, StartupProcShutdownHandler); /* request shutdown */
pqsignal(SIGQUIT, startupproc_quickdie); /* hard crash time */
pqsignal(SIGALRM, SIG_IGN);
pqsignal(SIGTERM, StartupProcShutdownHandler); /* request shutdown */
pqsignal(SIGQUIT, startupproc_quickdie); /* hard crash time */
if (XLogRequestRecoveryConnections)
pqsignal(SIGALRM, handle_standby_sig_alarm); /* ignored unless InHotStandby */
else
pqsignal(SIGALRM, SIG_IGN);
pqsignal(SIGPIPE, SIG_IGN);
pqsignal(SIGUSR1, SIG_IGN);
pqsignal(SIGUSR2, SIG_IGN);