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Code Issues Releases Activity

use pg_ptrack_get_block_2 to read block by relfilenode without relcache

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This commit is contained in:
Anastasia 2017-12-28 16:28:38 +03:00
parent 109b9968cc
commit 389c82fffb
1 changed files with 41 additions and 35 deletions
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76
src/backup.c
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@ -2677,7 +2677,7 @@ pg_ptrack_get_block(Oid dbOid,
PGresult *res_db;
PGresult *res;
const char *dbname;
char *params[3];
char *params[4];
char *result;
char *val;
PGconn *tmp_conn;
@ -2685,47 +2685,51 @@ pg_ptrack_get_block(Oid dbOid,
params[0] = palloc(64);
params[1] = palloc(64);
params[2] = palloc(64);
params[3] = palloc(64);
sprintf(params[0], "%i", dbOid);
res_db = pgut_execute(backup_conn,
"SELECT datname FROM pg_database WHERE oid=$1",
1, (const char **) params, true);
/*
* If database is not found, it's not an error.
* It could have been deleted.
*/
if (PQntuples(res_db) != 1 || PQnfields(res_db) != 1)
{
//elog(LOG, "Database with oid %d is not found", dbOid);
return NULL;
}
dbname = PQgetvalue(res_db, 0, 0);
if (strcmp(dbname, "template0") == 0)
{
/*
* There is no way to connect to the template0 database.
* But it's totally OK, since files there can never be changed.
*/
return NULL;
}
tmp_conn = pgut_connect(dbname);
// sprintf(params[0], "%i", dbOid);
// res_db = pgut_execute(backup_conn,
// "SELECT datname FROM pg_database WHERE oid=$1",
// 1, (const char **) params, true);
// /*
// * If database is not found, it's not an error.
// * It could have been deleted.
// */
// if (PQntuples(res_db) != 1 || PQnfields(res_db) != 1)
// {
// //elog(LOG, "Database with oid %d is not found", dbOid);
// return NULL;
// }
//
// dbname = PQgetvalue(res_db, 0, 0);
// if (strcmp(dbname, "template0") == 0)
// {
// /*
// * There is no way to connect to the template0 database.
// * But it's totally OK, since files there can never be changed.
// */
// return NULL;
// }
// tmp_conn = pgut_connect(dbname);
/*
* Use backup_conn, cause we can do it from any database.
*/
sprintf(params[0], "%i", tblsOid);
sprintf(params[1], "%i", relOid);
sprintf(params[2], "%u", blknum);
sprintf(params[1], "%i", dbOid);
sprintf(params[2], "%i", relOid);
sprintf(params[3], "%u", blknum);
//elog(WARNING, "db %i pg_ptrack_get_block(%i, %i, %u)",dbOid, tblsOid, relOid, blknum);
res = pgut_execute(tmp_conn, "SELECT pg_ptrack_get_block($1, $2, $3)",
3, (const char **)params, true);
//elog(LOG, "db %i pg_ptrack_get_block(%i, %i, %u)",dbOid, tblsOid, relOid, blknum);
res = pgut_execute(backup_conn, "SELECT pg_ptrack_get_block_2($1, $2, $3, $4)",
4, (const char **)params, true);
if (PQnfields(res) != 1)
elog(WARNING, "cannot get file block for relation oid %u",
relOid);
{
elog(LOG, "cannot get file block for relation oid %u",
relOid);
return NULL;
}
val = PQgetvalue(res, 0, 0);
@ -2735,12 +2739,14 @@ pg_ptrack_get_block(Oid dbOid,
result = (char *) PQunescapeBytea((unsigned char *) PQgetvalue(res, 0, 0),
result_size);
pgut_disconnect(tmp_conn);
// pgut_disconnect(tmp_conn);
// PQclear(res_db);
PQclear(res);
PQclear(res_db);
pfree(params[0]);
pfree(params[1]);
pfree(params[2]);
pfree(params[3]);
return result;
}