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grunskis-bonial 2018-10-30 14:29:09 +01:00 committed by Daniele Varrazzo
parent f946042a79
commit ff91ad5186
3 changed files with 18 additions and 4 deletions
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15
doc/src/extras.rst
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@ -506,10 +506,23 @@ The individual messages in the replication stream are represented by
try:
sel = select([cur], [], [], max(0, timeout))
if not any(sel):
cur.send_feedback(flush_lsn=cur.wal_end) # timed out, send keepalive message
cur.send_feedback() # timed out, send keepalive message
except InterruptedError:
pass # recalculate timeout and continue
.. warning::
The ``consume({msg})`` function will only be called when
there are new database writes on the server e.g. any DML or
DDL statement. Depending on your Postgres cluster
configuration this might cause the server to run out of disk
space if the writes are far apart. To prevent this from
happening you can use `~ReplicationCursor.wal_end` value to
periodically send feedback to the server to notify that your
replication client has received and processed all the
messages.
.. index::
pair: Cursor; Replication

3
psycopg/pqpath.c
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@ -1550,6 +1550,8 @@ retry:
(*msg)->data_start = data_start;
(*msg)->wal_end = wal_end;
(*msg)->send_time = send_time;
repl->wal_end = wal_end;
}
else if (buffer[0] == 'k') {
/* Primary keepalive message: msgtype(1), walEnd(8), sendTime(8), reply(1) */
@ -1577,7 +1579,6 @@ retry:
goto exit;
}
repl->wal_end = wal_end;
ret = 0;
exit:

4
psycopg/replication_cursor.h
View File

@ -44,11 +44,11 @@ typedef struct replicationCursorObject {
struct timeval last_io; /* timestamp of the last exchange with the server */
struct timeval keepalive_interval; /* interval for keepalive messages in replication mode */
XLogRecPtr wal_end; /* WAL end pointer from the last exchange with the server */
XLogRecPtr write_lsn; /* LSNs for replication feedback messages */
XLogRecPtr flush_lsn;
XLogRecPtr apply_lsn;
XLogRecPtr wal_end; /* WAL end pointer from the last exchange with the server */
} replicationCursorObject;