The Magic of Hot Streaming Replication

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1 The Magic of Hot Streaming Replication BRUCE MOMJIAN POSTGRESQL 9.0 offers new facilities for maintaining a current standby server and for issuing read-only queries on the standby server. This tutorial covers these new facilities. Creative Commons Attribution License Last updated: September, / 22

2 Introduction How does WAL combined with a disk image enable standby servers? (review) How do you configure continuous archiving? How do you configure a streaming, read-only server? Multi-Server complexities Primary/Standby synchronization complexities The Magic of Hot, Streaming Replication 2 / 22

3 Write-Ahead Logging (xlog) Postgres Backend Postgres Backend Postgres Backend Recovery Query and Checkpoint Operations Transaction Durability PostgreSQL Shared Buffer Cache Write Ahead Log fsync Kernel Disk Buffer Cache fsync Disk Blocks The Magic of Hot, Streaming Replication 3 / 22

4 Pre-9.0 Continuous Archiving / Point-In-Time Recovery (PITR) 02:00 09:00 11:00 13:00 WAL WAL WAL File System Level Backup Continuous Archive (WAL) The Magic of Hot, Streaming Replication 4 / 22

5 PITR Backup Procedures 1. wal_level = archive 2. archive_mode = on 3. archive_command = cp -i %p /mnt/server/pgsql/%f < /dev/null 4. SELECT pg_start_backup( label ); 5. Perform file system-level backup (can be inconsistent) 6. SELECT pg_stop_backup(); The Magic of Hot, Streaming Replication 5 / 22

6 PITR Recovery 17:00 17:30 17:40 17:55 WAL WAL WAL File System Continuous Level Backup Archive (WAL) The Magic of Hot, Streaming Replication 6 / 22

7 PITR Recovery Procedures 1. Stop postmaster 2. Restore file system-level backup 3. Make adjustments as outlined in the documentation 4. Create recovery.conf 5. restore_command = cp /mnt/server/pgsql/%f %p 6. Start the postmaster The Magic of Hot, Streaming Replication 7 / 22

8 Disadvantages Only complete 16MB files can be shipped archive_timeout can be used to force more frequent shipping (this increases archive storage requirements) No queries on the standby The Magic of Hot, Streaming Replication 8 / 22

9 9.0 Streaming Replication / Hot Standby Changes are streamed to the standby, greatly reducing log shipping delays Standby can accept read-only queries The Magic of Hot, Streaming Replication 9 / 22

10 Streaming Replication Differs from PITR File system backup is restored immediately on the standby server WAL files are streamed to the slave WAL files can also be archived if point-in-time recovery (PITR) is desired The Magic of Hot, Streaming Replication 10 / 22

11 How Does Streaming Replication Work? 02:00 09:00 11:00 13:00 WAL WAL WAL File System Level Backup Standby Server The Magic of Hot, Streaming Replication 11 / 22

12 Live Streaming Replication Primary Standby /pg_xlog Network /pg_xlog archive command WAL Archive Directory restore command The Magic of Hot, Streaming Replication 12 / 22

13 Enable Streaming to the Standby Enable the proper WAL contents: wal_level = hot_standby Enable the ability to stream WAL to the standby: max_wal_senders = 1 Retain WAL files needed by the standby: wal_keep_segments = 50 The Magic of Hot, Streaming Replication 13 / 22

14 Enable Standby Connection Permissions Add permission for replication to pg_hba.conf: host replication postgres /32 trust Start the primary server: pg_ctl -l /u/pg/data/server.log start The Magic of Hot, Streaming Replication 14 / 22

15 Perform a WAL-Supported File System Backup Start psql and issue: SELECT pg_start_backup( testing ); Copy the database /u/pg/data to a new directory, /u/pg/data2: cp -p -R /u/pg/data /u/pg/data2 Dash-p preserves ownership. The copy is inconsistent, but that is okay (WAL replay will correct that). Signal the backup is complete from psql: SELECT pg_stop_backup(); The Magic of Hot, Streaming Replication 15 / 22

16 Configure the Standby Remove /data2/postmaster.pid so the standby server does not see the primary server s pid as its own: rm /u/pg/data2/postmaster.pid (This is only necessary because we are testing with the primary and slave on the same computer.) Edit postgresql.conf on the standby and change the port to 5433 port = 5433 Enable hot standby in postgresql.conf: hot_standby = on The Magic of Hot, Streaming Replication 16 / 22

17 Configure the Standby For Streaming Replication Create recovery.conf: cp /u/pg/share/recovery.conf.sample /u/pg/data2/recovery.conf Enable streaming in recovery.conf: standby_mode = on primary_conninfo = host=localhost port=5432 Start the standby server: PGDATA=/u/pg/data2 pg_ctl -l /u/pg/data2/server.log start The Magic of Hot, Streaming Replication 17 / 22

18 Test Streaming Replication and Hot Standby $ psql -p c CREATE TABLE streamtest(x int) postgres $ psql -p c \d postgres List of relations Schema Name Type Owner public streamtest table postgres (1 row) $ psql -p c INSERT INTO streamtest VALUES (1) postgres INSERT 0 1 $ psql -p c INSERT INTO streamtest VALUES (1) postgres ERROR: cannot execute INSERT in a read-only transaction The Magic of Hot, Streaming Replication 18 / 22

19 Additional Complexities Multi-server permissions Stream from /pg_xlog and the continuous archive directory if archive_mode is enabled on the primary The Magic of Hot, Streaming Replication 19 / 22

20 Primary/Standby Synchronization Issues The primary server can take actions that cause long-running queries on the standby to be cancelled. Specifically, the cleanup of unnecessary rows that are still of interest to long-running queries on the standby can cause long-running queries to be cancelled on the standby. Standby query cancellation can be minimized in two ways: 1. Delay cleanup of old records on the primary with vacuum_defer_cleanup_age in postgresql.conf. 2. Delay application of WAL logs on the standby with max_standby_streaming_delay and max_standby_archive_delay in postgresql.conf. The default is 30 seconds; -1 causes application to delay indefinitely to prevent query cancellation. This also delays changes from appearing on the standby and can lengthen the time required for failover to the slave. The Magic of Hot, Streaming Replication 20 / 22

21 Postgres 9.1 Improvements Replication can be synchronous Standby feedback prevents the master from removing rows needed on the standby New tool to a create standby server using a Postgres database connection New streaming replication monitoring and control tools 9.2 improvements include allowing standbys to stream to other standbys. 9.3 will allow secondary standbys to more easily reconnect to a promoted standby. The Magic of Hot, Streaming Replication 21 / 22

22 Conclusion Manet, Bar at Folies Bergère The Magic of Hot, Streaming Replication 22 / 22

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