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pg_upgrade: preserve the timestamp epoch

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This is useful for replication tools like Slony and Skytools.

Report by Sergey Konoplev
This commit is contained in:
Bruce Momjian 2014-09-05 19:19:41 -04:00
parent 1f4d1074c5
commit a74a4aa23b
4 changed files with 20 additions and 10 deletions
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18
contrib/pg_upgrade/controldata.c
View File

@ -209,16 +209,20 @@ get_control_data(ClusterInfo *cluster, bool live_check)
}
else if ((p = strstr(bufin, "Latest checkpoint's NextXID:")) != NULL)
{
char *op = strchr(p, '/');
p = strchr(p, ':');
if (op == NULL)
op = strchr(p, ':');
if (op == NULL || strlen(op) <= 1)
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
op++; /* removing ':' char */
cluster->controldata.chkpnt_nxtxid = str2uint(op);
p++; /* removing ':' char */
cluster->controldata.chkpnt_nxtepoch = str2uint(p);
p = strchr(p, '/');
if (p == NULL || strlen(p) <= 1)
pg_fatal("%d: controldata retrieval problem\n", __LINE__);
p++; /* removing '/' char */
cluster->controldata.chkpnt_nxtxid = str2uint(p);
got_xid = true;
}
else if ((p = strstr(bufin, "Latest checkpoint's NextOID:")) != NULL)

8
contrib/pg_upgrade/pg_upgrade.c
View File

@ -420,12 +420,16 @@ copy_clog_xlog_xid(void)
/* copy old commit logs to new data dir */
copy_subdir_files("pg_clog");
/* set the next transaction id of the new cluster */
prep_status("Setting next transaction ID for new cluster");
/* set the next transaction id and epoch of the new cluster */
prep_status("Setting next transaction ID and epoch for new cluster");
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/pg_resetxlog\" -f -x %u \"%s\"",
new_cluster.bindir, old_cluster.controldata.chkpnt_nxtxid,
new_cluster.pgdata);
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/pg_resetxlog\" -f -e %u \"%s\"",
new_cluster.bindir, old_cluster.controldata.chkpnt_nxtepoch,
new_cluster.pgdata);
check_ok();
/*

1
contrib/pg_upgrade/pg_upgrade.h
View File

@ -190,6 +190,7 @@ typedef struct
char nextxlogfile[25];
uint32 chkpnt_tli;
uint32 chkpnt_nxtxid;
uint32 chkpnt_nxtepoch;
uint32 chkpnt_nxtoid;
uint32 chkpnt_nxtmulti;
uint32 chkpnt_nxtmxoff;

3
doc/src/sgml/ref/pg_resetxlog.sgml
View File

@ -166,7 +166,8 @@ PostgreSQL documentation
except in the field that is set by <command>pg_resetxlog</command>,
so any value will work so far as the database itself is concerned.
You might need to adjust this value to ensure that replication
systems such as <application>Slony-I</> work correctly &mdash;
systems such as <application>Slony-I</> and
<application>Skytools</> work correctly &mdash;
if so, an appropriate value should be obtainable from the state of
the downstream replicated database.
</para>