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Print a status message while waiting on old transactions to finish, including a backend PID we are waiting on, so that the user knows pg_reorg is hung and can do something about it.

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Josh Kupershmidt 2012-09-14 22:07:58 -07:00 committed by Daniele Varrazzo
parent 2ba1a575ac
commit 612495ecd6
1 changed files with 27 additions and 10 deletions
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37
bin/pg_reorg.c
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@ -34,11 +34,11 @@ const char *PROGRAM_EMAIL = "reorg-general@lists.pgfoundry.org";
" WHERE locktype = 'transactionid' AND pid <> pg_backend_pid()"
#define SQL_XID_ALIVE_80300 \
"SELECT 1 FROM pg_locks WHERE locktype = 'virtualxid'"\
" AND pid <> pg_backend_pid() AND virtualtransaction = ANY($1) LIMIT 1"
"SELECT pid FROM pg_locks WHERE locktype = 'virtualxid'"\
" AND pid <> pg_backend_pid() AND virtualtransaction = ANY($1)"
#define SQL_XID_ALIVE_80200 \
"SELECT 1 FROM pg_locks WHERE locktype = 'transactionid'"\
" AND pid <> pg_backend_pid() AND transactionid = ANY($1) LIMIT 1"
"SELECT pid FROM pg_locks WHERE locktype = 'transactionid'"\
" AND pid <> pg_backend_pid() AND transactionid = ANY($1)"
#define SQL_XID_SNAPSHOT \
(PQserverVersion(connection) >= 80300 \
@ -383,6 +383,7 @@ reorg_one_table(const reorg_table *table, const char *orderby)
const char *params[1];
int num;
int i;
int num_waiting = 0;
char *vxid;
char buffer[12];
StringInfoData sql;
@ -509,16 +510,32 @@ reorg_one_table(const reorg_table *table, const char *orderby)
params[0] = vxid;
res = execute(SQL_XID_ALIVE, 1, params);
num = PQntuples(res);
PQclear(res);
if (num > 0)
{
sleep(1);
continue; /* wait for old transactions */
}
/* Wait for old transactions.
* Only display the message below when the number of
* transactions we are waiting on changes (presumably,
* num_waiting should only go down), so as not to
* be too noisy.
*/
if (num != num_waiting)
{
elog(NOTICE, "Waiting for %d transactions to finish. First PID: %s", num, PQgetvalue(res, 0, 0));
num_waiting = num;
}
/* ok, go to next step. */
break;
PQclear(res);
sleep(1);
continue;
}
else
{
/* All old transactions are finished;
* go to next step. */
PQclear(res);
break;
}
}
/*