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Diffstat (limited to 'docs/tcp_replication.rst')
| -rw-r--r-- | docs/tcp_replication.rst | 53 |
1 files changed, 28 insertions, 25 deletions
diff --git a/docs/tcp_replication.rst b/docs/tcp_replication.rst index 946add2849..be0aa6b28c 100644 --- a/docs/tcp_replication.rst +++ b/docs/tcp_replication.rst @@ -34,20 +34,21 @@ command, and usually the connection will be closed. Since the protocol is a simple line based, its possible to manually connect to the server using a tool like netcat. A few things should be noted when manually using the protocol: - * When subscribing to a stream using ``REPLICATE``, the special token ``NOW`` can - be used to get all future updates. The special stream name ``ALL`` can be used - with ``NOW`` to subscribe to all available streams. - * The federation stream is only available if federation sending has been - disabled on the main process. - * The server will only time connections out that have sent a ``PING`` command. - If a ping is sent then the connection will be closed if no further commands - are receieved within 15s. Both the client and server protocol implementations - will send an initial PING on connection and ensure at least one command every - 5s is sent (not necessarily ``PING``). - * ``RDATA`` commands *usually* include a numeric token, however if the stream - has multiple rows to replicate per token the server will send multiple - ``RDATA`` commands, with all but the last having a token of ``batch``. See - the documentation on ``commands.RdataCommand`` for further details. + +* When subscribing to a stream using ``REPLICATE``, the special token ``NOW`` can + be used to get all future updates. The special stream name ``ALL`` can be used + with ``NOW`` to subscribe to all available streams. +* The federation stream is only available if federation sending has been + disabled on the main process. +* The server will only time connections out that have sent a ``PING`` command. + If a ping is sent then the connection will be closed if no further commands + are receieved within 15s. Both the client and server protocol implementations + will send an initial PING on connection and ensure at least one command every + 5s is sent (not necessarily ``PING``). +* ``RDATA`` commands *usually* include a numeric token, however if the stream + has multiple rows to replicate per token the server will send multiple + ``RDATA`` commands, with all but the last having a token of ``batch``. See + the documentation on ``commands.RdataCommand`` for further details. Architecture @@ -84,19 +85,21 @@ Start up ~~~~~~~~ When a new connection is made, the server: - * Sends a ``SERVER`` command, which includes the identity of the server, allowing - the client to detect if its connected to the expected server - * Sends a ``PING`` command as above, to enable the client to time out connections - promptly. + +* Sends a ``SERVER`` command, which includes the identity of the server, allowing + the client to detect if its connected to the expected server +* Sends a ``PING`` command as above, to enable the client to time out connections + promptly. The client: - * Sends a ``NAME`` command, allowing the server to associate a human friendly - name with the connection. This is optional. - * Sends a ``PING`` as above - * For each stream the client wishes to subscribe to it sends a ``REPLICATE`` - with the stream_name and token it wants to subscribe from. - * On receipt of a ``SERVER`` command, checks that the server name matches the - expected server name. + +* Sends a ``NAME`` command, allowing the server to associate a human friendly + name with the connection. This is optional. +* Sends a ``PING`` as above +* For each stream the client wishes to subscribe to it sends a ``REPLICATE`` + with the stream_name and token it wants to subscribe from. +* On receipt of a ``SERVER`` command, checks that the server name matches the + expected server name. Error handling |