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pg_upgrade: check for clean server shutdowns

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Previously pg_upgrade checked for the pid file and started/stopped the
server to force a clean shutdown.  However, "pg_ctl -m immediate"
removes the pid file but doesn't do a clean shutdown, so check
pg_controldata for a clean shutdown too.

Diagnosed-by: Vimalraj A

Discussion: https://postgr.es/m/CAFKBAK5e4Q-oTUuPPJ56EU_d2Rzodq6GWKS3ncAk3xo7hAsOZg@mail.gmail.com

Backpatch-through: 9.3
This commit is contained in:
Bruce Momjian 2018-07-28 15:01:55 -04:00
parent 60e3bd1d7f
commit 244142d32a
2 changed files with 61 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

59
src/bin/pg_upgrade/controldata.c
View File

@ -58,6 +58,7 @@ get_control_data(ClusterInfo *cluster, bool live_check)
bool got_large_object = false;
bool got_date_is_int = false;
bool got_data_checksum_version = false;
bool got_cluster_state = false;
char *lc_collate = NULL;
char *lc_ctype = NULL;
char *lc_monetary = NULL;
@ -422,6 +423,64 @@ get_control_data(ClusterInfo *cluster, bool live_check)
pclose(output);
/*
* Check for clean shutdown
*/
/* only pg_controldata outputs the cluster state */
snprintf(cmd, sizeof(cmd), "\"%s/pg_controldata\" \"%s\"",
cluster->bindir, cluster->pgdata);
fflush(stdout);
fflush(stderr);
if ((output = popen(cmd, "r")) == NULL)
pg_fatal("could not get control data using %s: %s\n",
cmd, strerror(errno));
/* we have the result of cmd in "output". so parse it line by line now */
while (fgets(bufin, sizeof(bufin), output))
{
if ((!live_check || cluster == &new_cluster) &&
(p = strstr(bufin, "Database cluster state:")) != NULL)
{
p = strchr(p, ':');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: database cluster state problem\n", __LINE__);
p++; /* remove ':' char */
/*
* We checked earlier for a postmaster lock file, and if we found
* one, we tried to start/stop the server to replay the WAL. However,
* pg_ctl -m immediate doesn't leave a lock file, but does require
* WAL replay, so we check here that the server was shut down cleanly,
* from the controldata perspective.
*/
/* remove leading spaces */
while (*p == ' ')
p++;
if (strcmp(p, "shut down\n") != 0)
{
if (cluster == &old_cluster)
pg_fatal("The source cluster was not shut down cleanly.\n");
else
pg_fatal("The target cluster was not shut down cleanly.\n");
}
got_cluster_state = true;
}
}
pclose(output);
if (!got_cluster_state)
{
if (cluster == &old_cluster)
pg_fatal("The source cluster lacks cluster state information:\n");
else
pg_fatal("The target cluster lacks cluster state information:\n");
}
/*
* Restore environment variables
*/

3
src/bin/pg_upgrade/pg_upgrade.c
View File

@ -220,7 +220,8 @@ setup(char *argv0, bool *live_check)
* start, assume the server is running. If the pid file is left over
* from a server crash, this also allows any committed transactions
* stored in the WAL to be replayed so they are not lost, because WAL
* files are not transferred from old to new servers.
* files are not transferred from old to new servers. We later check
* for a clean shutdown.
*/
if (start_postmaster(&old_cluster, false))
stop_postmaster(false);