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Commit1c850fa

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Make smart shutdown work in combination with Hot Standby/Streaming Replication.
At present, killing the startup process does not release any locks it holds,so we must wait to stop the startup and walreceiver processes until allread-only backends have exited. Without this patch, the startup andwalreceiver processes never exit, so the server gets permanently stuck ina half-shutdown state.Fujii Masao, with review, docs, and comment adjustments by me.
1 parent2c0870f commit1c850fa

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3 files changed

+42
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lines changed

3 files changed

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‎doc/src/sgml/ref/pg_ctl-ref.sgml

Lines changed: 3 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
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<!--
2-
$PostgreSQL: pgsql/doc/src/sgml/ref/pg_ctl-ref.sgml,v 1.49 2010/04/03 07:23:01 petere Exp $
2+
$PostgreSQL: pgsql/doc/src/sgml/ref/pg_ctl-ref.sgml,v 1.50 2010/04/08 01:39:37 rhaas Exp $
33
PostgreSQL documentation
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-->
55

@@ -152,6 +152,8 @@ PostgreSQL documentation
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shutdown methods can be selected with the <option>-m</option>
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option: <quote>Smart</quote> mode waits for online backup mode
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to finish and all the clients to disconnect. This is the default.
155+
If the server is in recovery, recovery and streaming replication
156+
will be terminated once all clients have disconnected.
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<quote>Fast</quote> mode does not wait for clients to disconnect and
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will terminate an online backup in progress. All active transactions are
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rolled back and clients are forcibly disconnected, then the

‎doc/src/sgml/runtime.sgml

Lines changed: 4 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.433 2010/03/21 00:43:40 momjian Exp $ -->
1+
<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.434 2010/04/08 01:39:37 rhaas Exp $ -->
22

33
<chapter Id="runtime">
44
<title>Server Setup and Operation</title>
@@ -1338,7 +1338,9 @@ echo -17 > /proc/self/oom_adj
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until online backup mode is no longer active. While backup mode is
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active, new connections will still be allowed, but only to superusers
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(this exception allows a superuser to connect to terminate
1341-
online backup mode).
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online backup mode). If the server is in recovery when a smart
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shutdown is requested, recovery and streaming replication will be
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stopped only after all regular sessions have terminated.
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</para>
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</listitem>
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</varlistentry>

‎src/backend/postmaster/postmaster.c

Lines changed: 35 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -37,7 +37,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.604 2010/03/25 20:40:17 sriggs Exp $
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* $PostgreSQL: pgsql/src/backend/postmaster/postmaster.c,v 1.605 2010/04/08 01:39:37 rhaas Exp $
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*
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* NOTES
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*
@@ -278,6 +278,7 @@ typedef enum
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PM_RECOVERY_CONSISTENT,/* consistent recovery mode */
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PM_RUN,/* normal "database is alive" state */
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PM_WAIT_BACKUP,/* waiting for online backup mode to end */
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PM_WAIT_READONLY,/* waiting for read only backends to exit */
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PM_WAIT_BACKENDS,/* waiting for live backends to exit */
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PM_SHUTDOWN,/* waiting for bgwriter to do shutdown ckpt */
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PM_SHUTDOWN_2,/* waiting for archiver and walsenders to
@@ -2173,7 +2174,17 @@ pmdie(SIGNAL_ARGS)
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/* and the walwriter too */
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if (WalWriterPID!=0)
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signal_child(WalWriterPID,SIGTERM);
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pmState=PM_WAIT_BACKUP;
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/*
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* If we're in recovery, we can't kill the startup process
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* right away, because at present doing so does not release
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* its locks. We might want to change this in a future
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* release. For the time being, the PM_WAIT_READONLY state
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* indicates that we're waiting for the regular (read only)
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* backends to die off; once they do, we'll kill the startup
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* and walreceiver processes.
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*/
2186+
pmState= (pmState==PM_RUN) ?
2187+
PM_WAIT_BACKUP :PM_WAIT_READONLY;
21772188
}
21782189

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/*
@@ -2209,6 +2220,7 @@ pmdie(SIGNAL_ARGS)
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}
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if (pmState==PM_RUN||
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pmState==PM_WAIT_BACKUP||
2223+
pmState==PM_WAIT_READONLY||
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pmState==PM_WAIT_BACKENDS||
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pmState==PM_RECOVERY_CONSISTENT)
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{
@@ -2771,6 +2783,7 @@ HandleChildCrash(int pid, int exitstatus, const char *procname)
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pmState==PM_RECOVERY_CONSISTENT||
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pmState==PM_RUN||
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pmState==PM_WAIT_BACKUP||
2786+
pmState==PM_WAIT_READONLY||
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pmState==PM_SHUTDOWN)
27752788
pmState=PM_WAIT_BACKENDS;
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}
@@ -2846,6 +2859,26 @@ PostmasterStateMachine(void)
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pmState=PM_WAIT_BACKENDS;
28472860
}
28482861

2862+
if (pmState==PM_WAIT_READONLY)
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{
2864+
/*
2865+
* PM_WAIT_READONLY state ends when we have no regular backends that
2866+
* have been started during recovery. We kill the startup and
2867+
* walreceiver processes and transition to PM_WAIT_BACKENDS. Ideally,
2868+
* we might like to kill these processes first and then wait for
2869+
* backends to die off, but that doesn't work at present because
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* killing the startup process doesn't release its locks.
2871+
*/
2872+
if (CountChildren(BACKEND_TYPE_NORMAL)==0)
2873+
{
2874+
if (StartupPID!=0)
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signal_child(StartupPID,SIGTERM);
2876+
if (WalReceiverPID!=0)
2877+
signal_child(WalReceiverPID,SIGTERM);
2878+
pmState=PM_WAIT_BACKENDS;
2879+
}
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}
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/*
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* If we are in a state-machine state that implies waiting for backends to
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* exit, see if they're all gone, and change state if so.

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