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Resolution</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="auth_chain_difference_algorithm.html">The Auth Chain Difference Algorithm</a></li></ol></li><li class="chapter-item expanded "><a href="media_repository.html">Media Repository</a></li><li class="chapter-item expanded "><a href="room_and_user_statistics.html">Room and User Statistics</a></li></ol></li><li class="chapter-item expanded "><div>Scripts</div></li><li class="chapter-item expanded affix "><li class="part-title">Other</li><li class="chapter-item expanded "><a href="deprecation_policy.html">Dependency Deprecation Policy</a></li><li class="chapter-item expanded "><a href="other/running_synapse_on_single_board_computers.html">Running Synapse on a Single-Board Computer</a></li></ol> + </div> + <div id="sidebar-resize-handle" class="sidebar-resize-handle"></div> + </nav> + + <div id="page-wrapper" class="page-wrapper"> + + <div class="page"> + + <div id="menu-bar-hover-placeholder"></div> + <div 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It is a common api for facilitating vendor-agnostic +tracing instrumentation. That is, we can use the OpenTracing api and +select one of a number of tracer implementations to do the heavy lifting +in the background. Our current selected implementation is Jaeger.</p> +<p>OpenTracing is a tool which gives an insight into the causal +relationship of work done in and between servers. The servers each track +events and report them to a centralised server - in Synapse's case: +Jaeger. The basic unit used to represent events is the span. The span +roughly represents a single piece of work that was done and the time at +which it occurred. A span can have child spans, meaning that the work of +the child had to be completed for the parent span to complete, or it can +have follow-on spans which represent work that is undertaken as a result +of the parent but is not depended on by the parent to in order to +finish.</p> +<p>Since this is undertaken in a distributed environment a request to +another server, such as an RPC or a simple GET, can be considered a span +(a unit or work) for the local server. This causal link is what +OpenTracing aims to capture and visualise. In order to do this metadata +about the local server's span, i.e the 'span context', needs to be +included with the request to the remote.</p> +<p>It is up to the remote server to decide what it does with the spans it +creates. This is called the sampling policy and it can be configured +through Jaeger's settings.</p> +<p>For OpenTracing concepts see +<a href="https://opentracing.io/docs/overview/what-is-tracing/">https://opentracing.io/docs/overview/what-is-tracing/</a>.</p> +<p>For more information about Jaeger's implementation see +<a href="https://www.jaegertracing.io/docs/">https://www.jaegertracing.io/docs/</a></p> +<h2 id="setting-up-opentracing"><a class="header" href="#setting-up-opentracing">Setting up OpenTracing</a></h2> +<p>To receive OpenTracing spans, start up a Jaeger server. This can be done +using docker like so:</p> +<pre><code class="language-sh">docker run -d --name jaeger \ + -p 6831:6831/udp \ + -p 6832:6832/udp \ + -p 5778:5778 \ + -p 16686:16686 \ + -p 14268:14268 \ + jaegertracing/all-in-one:1 +</code></pre> +<p>Latest documentation is probably at +https://www.jaegertracing.io/docs/latest/getting-started.</p> +<h2 id="enable-opentracing-in-synapse"><a class="header" href="#enable-opentracing-in-synapse">Enable OpenTracing in Synapse</a></h2> +<p>OpenTracing is not enabled by default. It must be enabled in the +homeserver config by uncommenting the config options under <code>opentracing</code> +as shown in the <a href="./sample_config.yaml">sample config</a>. For example:</p> +<pre><code class="language-yaml">opentracing: + enabled: true + homeserver_whitelist: + - "mytrustedhomeserver.org" + - "*.myotherhomeservers.com" +</code></pre> +<h2 id="homeserver-whitelisting"><a class="header" href="#homeserver-whitelisting">Homeserver whitelisting</a></h2> +<p>The homeserver whitelist is configured using regular expressions. A list +of regular expressions can be given and their union will be compared +when propagating any spans contexts to another homeserver.</p> +<p>Though it's mostly safe to send and receive span contexts to and from +untrusted users since span contexts are usually opaque ids it can lead +to two problems, namely:</p> +<ul> +<li>If the span context is marked as sampled by the sending homeserver +the receiver will sample it. Therefore two homeservers with wildly +different sampling policies could incur higher sampling counts than +intended.</li> +<li>Sending servers can attach arbitrary data to spans, known as +'baggage'. For safety this has been disabled in Synapse but that +doesn't prevent another server sending you baggage which will be +logged to OpenTracing's logs.</li> +</ul> +<h2 id="configuring-jaeger"><a class="header" href="#configuring-jaeger">Configuring Jaeger</a></h2> +<p>Sampling strategies can be set as in this document: +<a href="https://www.jaegertracing.io/docs/latest/sampling/">https://www.jaegertracing.io/docs/latest/sampling/</a>.</p> + + </main> + + <nav class="nav-wrapper" aria-label="Page navigation"> + <!-- Mobile navigation buttons --> + + <a rel="prev" href="development/git.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> + <i class="fa fa-angle-left"></i> + </a> + + + + <a rel="next" href="development/database_schema.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> + <i class="fa fa-angle-right"></i> + </a> + + + <div style="clear: both"></div> + </nav> + </div> + </div> + + <nav class="nav-wide-wrapper" aria-label="Page navigation"> + + <a rel="prev" href="development/git.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left"> + <i class="fa fa-angle-left"></i> + </a> + + + + <a rel="next" href="development/database_schema.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right"> + <i class="fa fa-angle-right"></i> + </a> + + </nav> + + </div> + + + + + + + + + <script type="text/javascript"> + window.playground_copyable = true; + </script> + + + + + + <script src="elasticlunr.min.js" type="text/javascript" charset="utf-8"></script> + <script src="mark.min.js" type="text/javascript" charset="utf-8"></script> + <script src="searcher.js" type="text/javascript" charset="utf-8"></script> + + + <script src="clipboard.min.js" type="text/javascript" charset="utf-8"></script> + <script src="highlight.js" type="text/javascript" charset="utf-8"></script> + <script src="book.js" type="text/javascript" charset="utf-8"></script> + + <!-- Custom JS scripts --> + + <script type="text/javascript" src="docs/website_files/table-of-contents.js"></script> + + + + + </body> +</html> \ No newline at end of file |