Hi, I downloaded the code from this github tag https://github.com/postgres/postgres/archive/REL9_6_8.tar.gz I unpacked the code on disk where gdb was looking for it /build/postgresql-9.6-9VrjLn/postgresql-9.6-9.6.8 Then I ran this oneliner which is a summary of my debug process. So, apparently pg_dump -Fd -j2 does not work in the case of pre-9.2 but it also doesn't work for standby servers. gdb /usr/lib/postgresql/9.6/bin/pg_dump -ex 'set confirm off' -ex 'set listsize 30' -ex 'set pagination off' -ex 'b 1131' -ex 'r -Fd -j2 -d TIMS_SOMEDB -h /var/run/postgresql/pg-prod-7 -f /tmp/TIMS_SOMEDB_fd.dmp' -ex 'l' -ex 'p AH->numWorkers' -ex 'p AH->remoteVersion' -ex 'p dopt->no_synchronized_snapshots' -ex 'q' 1131 else if (AH->numWorkers > 1 && 1116 * worker, we'll be passed dumpsnapshot == NULL, but AH->sync_snapshot_id 1117 * is already set (if the server can handle it) and we should use that. 1118 */ 1119 if (dumpsnapshot) 1120 AH->sync_snapshot_id = pg_strdup(dumpsnapshot); 1121 1122 if (AH->sync_snapshot_id) 1123 { 1124 PQExpBuffer query = createPQExpBuffer(); 1125 1126 appendPQExpBuffer(query, "SET TRANSACTION SNAPSHOT "); 1127 appendStringLiteralConn(query, AH->sync_snapshot_id, conn); 1128 ExecuteSqlStatement(AH, query->data); 1129 destroyPQExpBuffer(query); 1130 } 1131 else if (AH->numWorkers > 1 && 1132 AH->remoteVersion >= 90200 && 1133 !dopt->no_synchronized_snapshots) 1134 { 1135 if (AH->isStandby) 1136 exit_horribly(NULL, 1137 "Synchronized snapshots are not supported on standby servers.\n" 1138 "Run with --no-synchronized-snapshots instead if you do not need\n" 1139 "synchronized snapshots.\n"); 1140 1141 1142 AH->sync_snapshot_id = get_synchronized_snapshot(AH); 1143 } 1144 } 1145 $1 = 2 $2 = 90606 $3 = 0 I was expecting the code to be the same as the one in [1], but it seems to be different (I don't know why) I wonder why synchronized snapshots are not supported on standby servers. The code in [1] says they should work for standby servers. My master is 9.6.6 and my slave is 9.6.6 as well. Any ideas would be appreciated. Thank you, Stefan [1] https://github.com/postgres/postgres/blob/REL9_6_STABLE/src/bin/pg_dump/pg_dump.c#L689 Stefan Petrea System Engineer/DBA, Network Engineering stefan.petrea@xxxxxxxxxx tangoe.com This e-mail message, including any attachments, is for the sole use of the intended recipient of this message, and may contain information that is confidential or legally protected. If you are not the intended recipient or have received this message in error, you are not authorized to copy, distribute, or otherwise use this message or its attachments. Please notify the sender immediately by return e-mail and permanently delete this message and any attachments. Tangoe makes no warranty that this e-mail or its attachments are error or virus free.
