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- <h1 id="tcp-replication"><a class="header" href="#tcp-replication">TCP Replication</a></h1>
-<h2 id="motivation"><a class="header" href="#motivation">Motivation</a></h2>
-<p>Previously the workers used an HTTP long poll mechanism to get updates
-from the master, which had the problem of causing a lot of duplicate
-work on the server. This TCP protocol replaces those APIs with the aim
-of increased efficiency.</p>
-<h2 id="overview"><a class="header" href="#overview">Overview</a></h2>
-<p>The protocol is based on fire and forget, line based commands. An
-example flow would be (where '>' indicates master to worker and
-'<' worker to master flows):</p>
-<pre><code>> SERVER example.com
-< REPLICATE
-> POSITION events master 53 53
-> RDATA events master 54 ["$foo1:bar.com", ...]
-> RDATA events master 55 ["$foo4:bar.com", ...]
-</code></pre>
-<p>The example shows the server accepting a new connection and sending its identity
-with the <code>SERVER</code> command, followed by the client server to respond with the
-position of all streams. The server then periodically sends <code>RDATA</code> commands
-which have the format <code>RDATA <stream_name> <instance_name> <token> <row></code>, where
-the format of <code><row></code> is defined by the individual streams. The
-<code><instance_name></code> is the name of the Synapse process that generated the data
-(usually "master").</p>
-<p>Error reporting happens by either the client or server sending an ERROR
-command, and usually the connection will be closed.</p>
-<p>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:</p>
-<ul>
-<li>The federation stream is only available if federation sending has
-been disabled on the main process.</li>
-<li>The server will only time connections out that have sent a <code>PING</code>
-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 <code>PING</code>).</li>
-<li><code>RDATA</code> commands <em>usually</em> include a numeric token, however if the
-stream has multiple rows to replicate per token the server will send
-multiple <code>RDATA</code> commands, with all but the last having a token of
-<code>batch</code>. See the documentation on <code>commands.RdataCommand</code> for
-further details.</li>
-</ul>
-<h2 id="architecture"><a class="header" href="#architecture">Architecture</a></h2>
-<p>The basic structure of the protocol is line based, where the initial
-word of each line specifies the command. The rest of the line is parsed
-based on the command. For example, the RDATA command is defined as:</p>
-<pre><code>RDATA <stream_name> <instance_name> <token> <row_json>
-</code></pre>
-<p>(Note that <row_json> may contains spaces, but cannot contain
-newlines.)</p>
-<p>Blank lines are ignored.</p>
-<h3 id="keep-alives"><a class="header" href="#keep-alives">Keep alives</a></h3>
-<p>Both sides are expected to send at least one command every 5s or so, and
-should send a <code>PING</code> command if necessary. If either side do not receive
-a command within e.g. 15s then the connection should be closed.</p>
-<p>Because the server may be connected to manually using e.g. netcat, the
-timeouts aren't enabled until an initial <code>PING</code> command is seen. Both
-the client and server implementations below send a <code>PING</code> command
-immediately on connection to ensure the timeouts are enabled.</p>
-<p>This ensures that both sides can quickly realize if the tcp connection
-has gone and handle the situation appropriately.</p>
-<h3 id="start-up"><a class="header" href="#start-up">Start up</a></h3>
-<p>When a new connection is made, the server:</p>
-<ul>
-<li>Sends a <code>SERVER</code> command, which includes the identity of the server,
-allowing the client to detect if its connected to the expected
-server</li>
-<li>Sends a <code>PING</code> command as above, to enable the client to time out
-connections promptly.</li>
-</ul>
-<p>The client:</p>
-<ul>
-<li>Sends a <code>NAME</code> command, allowing the server to associate a human
-friendly name with the connection. This is optional.</li>
-<li>Sends a <code>PING</code> as above</li>
-<li>Sends a <code>REPLICATE</code> to get the current position of all streams.</li>
-<li>On receipt of a <code>SERVER</code> command, checks that the server name
-matches the expected server name.</li>
-</ul>
-<h3 id="error-handling"><a class="header" href="#error-handling">Error handling</a></h3>
-<p>If either side detects an error it can send an <code>ERROR</code> command and close
-the connection.</p>
-<p>If the client side loses the connection to the server it should
-reconnect, following the steps above.</p>
-<h3 id="congestion"><a class="header" href="#congestion">Congestion</a></h3>
-<p>If the server sends messages faster than the client can consume them the
-server will first buffer a (fairly large) number of commands and then
-disconnect the client. This ensures that we don't queue up an unbounded
-number of commands in memory and gives us a potential oppurtunity to
-squawk loudly. When/if the client recovers it can reconnect to the
-server and ask for missed messages.</p>
-<h3 id="reliability"><a class="header" href="#reliability">Reliability</a></h3>
-<p>In general the replication stream should be considered an unreliable
-transport since e.g. commands are not resent if the connection
-disappears.</p>
-<p>The exception to that are the replication streams, i.e. RDATA commands,
-since these include tokens which can be used to restart the stream on
-connection errors.</p>
-<p>The client should keep track of the token in the last RDATA command
-received for each stream so that on reconneciton it can start streaming
-from the correct place. Note: not all RDATA have valid tokens due to
-batching. See <code>RdataCommand</code> for more details.</p>
-<h3 id="example"><a class="header" href="#example">Example</a></h3>
-<p>An example iteraction is shown below. Each line is prefixed with '>'
-or '<' to indicate which side is sending, these are <em>not</em> included on
-the wire:</p>
-<pre><code>* connection established *
-> SERVER localhost:8823
-> PING 1490197665618
-< NAME synapse.app.appservice
-< PING 1490197665618
-< REPLICATE
-> POSITION events master 1 1
-> POSITION backfill master 1 1
-> POSITION caches master 1 1
-> RDATA caches master 2 ["get_user_by_id",["@01register-user:localhost:8823"],1490197670513]
-> RDATA events master 14 ["$149019767112vOHxz:localhost:8823",
- "!AFDCvgApUmpdfVjIXm:localhost:8823","m.room.guest_access","",null]
-< PING 1490197675618
-> ERROR server stopping
-* connection closed by server *
-</code></pre>
-<p>The <code>POSITION</code> command sent by the server is used to set the clients
-position without needing to send data with the <code>RDATA</code> command.</p>
-<p>An example of a batched set of <code>RDATA</code> is:</p>
-<pre><code>> RDATA caches master batch ["get_user_by_id",["@test:localhost:8823"],1490197670513]
-> RDATA caches master batch ["get_user_by_id",["@test2:localhost:8823"],1490197670513]
-> RDATA caches master batch ["get_user_by_id",["@test3:localhost:8823"],1490197670513]
-> RDATA caches master 54 ["get_user_by_id",["@test4:localhost:8823"],1490197670513]
-</code></pre>
-<p>In this case the client shouldn't advance their caches token until it
-sees the the last <code>RDATA</code>.</p>
-<h3 id="list-of-commands"><a class="header" href="#list-of-commands">List of commands</a></h3>
-<p>The list of valid commands, with which side can send it: server (S) or
-client (C):</p>
-<h4 id="server-s"><a class="header" href="#server-s">SERVER (S)</a></h4>
-<p>Sent at the start to identify which server the client is talking to</p>
-<h4 id="rdata-s"><a class="header" href="#rdata-s">RDATA (S)</a></h4>
-<p>A single update in a stream</p>
-<h4 id="position-s"><a class="header" href="#position-s">POSITION (S)</a></h4>
-<p>On receipt of a POSITION command clients should check if they have missed any
-updates, and if so then fetch them out of band. Sent in response to a
-REPLICATE command (but can happen at any time).</p>
-<p>The POSITION command includes the source of the stream. Currently all streams
-are written by a single process (usually "master"). If fetching missing
-updates via HTTP API, rather than via the DB, then processes should make the
-request to the appropriate process.</p>
-<p>Two positions are included, the "new" position and the last position sent respectively.
-This allows servers to tell instances that the positions have advanced but no
-data has been written, without clients needlessly checking to see if they
-have missed any updates.</p>
-<h4 id="error-s-c"><a class="header" href="#error-s-c">ERROR (S, C)</a></h4>
-<p>There was an error</p>
-<h4 id="ping-s-c"><a class="header" href="#ping-s-c">PING (S, C)</a></h4>
-<p>Sent periodically to ensure the connection is still alive</p>
-<h4 id="name-c"><a class="header" href="#name-c">NAME (C)</a></h4>
-<p>Sent at the start by client to inform the server who they are</p>
-<h4 id="replicate-c"><a class="header" href="#replicate-c">REPLICATE (C)</a></h4>
-<p>Asks the server for the current position of all streams.</p>
-<h4 id="user_sync-c"><a class="header" href="#user_sync-c">USER_SYNC (C)</a></h4>
-<p>A user has started or stopped syncing on this process.</p>
-<h4 id="clear_user_sync-c"><a class="header" href="#clear_user_sync-c">CLEAR_USER_SYNC (C)</a></h4>
-<p>The server should clear all associated user sync data from the worker.</p>
-<p>This is used when a worker is shutting down.</p>
-<h4 id="federation_ack-c"><a class="header" href="#federation_ack-c">FEDERATION_ACK (C)</a></h4>
-<p>Acknowledge receipt of some federation data</p>
-<h3 id="remote_server_up-s-c"><a class="header" href="#remote_server_up-s-c">REMOTE_SERVER_UP (S, C)</a></h3>
-<p>Inform other processes that a remote server may have come back online.</p>
-<p>See <code>synapse/replication/tcp/commands.py</code> for a detailed description and
-the format of each command.</p>
-<h3 id="cache-invalidation-stream"><a class="header" href="#cache-invalidation-stream">Cache Invalidation Stream</a></h3>
-<p>The cache invalidation stream is used to inform workers when they need
-to invalidate any of their caches in the data store. This is done by
-streaming all cache invalidations done on master down to the workers,
-assuming that any caches on the workers also exist on the master.</p>
-<p>Each individual cache invalidation results in a row being sent down
-replication, which includes the cache name (the name of the function)
-and they key to invalidate. For example:</p>
-<pre><code>> RDATA caches master 550953771 ["get_user_by_id", ["@bob:example.com"], 1550574873251]
-</code></pre>
-<p>Alternatively, an entire cache can be invalidated by sending down a <code>null</code>
-instead of the key. For example:</p>
-<pre><code>> RDATA caches master 550953772 ["get_user_by_id", null, 1550574873252]
-</code></pre>
-<p>However, there are times when a number of caches need to be invalidated
-at the same time with the same key. To reduce traffic we batch those
-invalidations into a single poke by defining a special cache name that
-workers understand to mean to expand to invalidate the correct caches.</p>
-<p>Currently the special cache names are declared in
-<code>synapse/storage/_base.py</code> and are:</p>
-<ol>
-<li><code>cs_cache_fake</code> ─ invalidates caches that depend on the current
-state</li>
-</ol>
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