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Make local copy of client hostnames in backend status array.

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The other strings, application_name and query string, were snapshotted to
local memory in pgstat_read_current_status(), but we forgot to do that for
client hostnames. As a result, the client hostname would appear to change in
the local copy, if the client disconnected.

Backpatch to all supported versions.

Author: Edmund Horner
Reviewed-by: Michael Paquier
Discussion: https://www.postgresql.org/message-id/CAMyN-kA7aOJzBmrYFdXcc7Z0NmW%2B5jBaf_m%3D_-77uRNyKC9r%3DA%40mail.gmail.com
This commit is contained in:
Heikki Linnakangas
2018-04-11 23:39:48 +03:00
parent bd213fd66a
commit dfc383cf39
1 changed files with 7 additions and 0 deletions
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7
src/backend/postmaster/pgstat.c
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@ -2786,6 +2786,7 @@ pgstat_read_current_status(void)
PgBackendStatus *localtable;
PgBackendStatus *localentry;
char *localappname,
*localclienthostname,
*localactivity;
int i;
@ -2801,6 +2802,9 @@ pgstat_read_current_status(void)
localappname = (char *)
MemoryContextAlloc(pgStatLocalContext,
NAMEDATALEN * MaxBackends);
localclienthostname = (char *)
MemoryContextAlloc(pgStatLocalContext,
NAMEDATALEN * MaxBackends);
localactivity = (char *)
MemoryContextAlloc(pgStatLocalContext,
pgstat_track_activity_query_size * MaxBackends);
@ -2832,6 +2836,8 @@ pgstat_read_current_status(void)
*/
strcpy(localappname, (char *) beentry->st_appname);
localentry->st_appname = localappname;
strcpy(localclienthostname, (char *) beentry->st_clienthostname);
localentry->st_clienthostname = localclienthostname;
strcpy(localactivity, (char *) beentry->st_activity);
localentry->st_activity = localactivity;
}
@ -2850,6 +2856,7 @@ pgstat_read_current_status(void)
{
localentry++;
localappname += NAMEDATALEN;
localclienthostname += NAMEDATALEN;
localactivity += pgstat_track_activity_query_size;
localNumBackends++;
}