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<div class="section" id="overview">
<h1>Overview<a class="headerlink" href="#overview" title="Permalink to this headline">¶</a></h1>
<p>DistributedLog (DL) is a high-performance, replicated log service,
offering durability, replication and strong consistency as essentials
for building reliable distributed systems.</p>
<div class="section" id="high-performance">
<h2>High Performance<a class="headerlink" href="#high-performance" title="Permalink to this headline">¶</a></h2>
<p>DL is able to provide milliseconds latency on durable writes with a
large number of concurrent logs, and handle high volume reads and writes
per second from thousands of clients.</p>
</div>
<div class="section" id="durable-and-consistent">
<h2>Durable and Consistent<a class="headerlink" href="#durable-and-consistent" title="Permalink to this headline">¶</a></h2>
<p>Messages are persisted on disk and replicated to store multiple copies
to prevent data loss. They are guaranteed to be consistent among writers
and readers in terms of strict ordering.</p>
</div>
<div class="section" id="efficient-fan-in-and-fan-out">
<h2>Efficient Fan-in and Fan-out<a class="headerlink" href="#efficient-fan-in-and-fan-out" title="Permalink to this headline">¶</a></h2>
<p>DL provides an efficient service layer that is optimized for running in
a multi- tenant datacenter environment such as Mesos or Yarn. The
service layer is able to support large scale writes (fan-in) and reads
(fan-out).</p>
</div>
<div class="section" id="various-workloads">
<h2>Various Workloads<a class="headerlink" href="#various-workloads" title="Permalink to this headline">¶</a></h2>
<p>DL supports various workloads from latency-sensitive online transaction
processing (OLTP) applications (e.g. WAL for distributed database and
in-memory replicated state machines), real-time stream ingestion and
computing, to analytical processing.</p>
</div>
<div class="section" id="multi-tenant">
<h2>Multi Tenant<a class="headerlink" href="#multi-tenant" title="Permalink to this headline">¶</a></h2>
<p>To support a large number of logs for multi-tenants, DL is designed for
I/O isolation in real-world workloads.</p>
</div>
<div class="section" id="layered-architecture">
<h2>Layered Architecture<a class="headerlink" href="#layered-architecture" title="Permalink to this headline">¶</a></h2>
<p>DL has a modern layered architecture design, which separates the
stateless service tier from the stateful storage tier. To support large
scale writes (fan- in) and reads (fan-out), DL allows scaling storage
independent of scaling CPU and memory.</p>
</div>
</div>
<div class="section" id="documentation-and-getting-started">
<h1>Documentation and Getting Started<a class="headerlink" href="#documentation-and-getting-started" title="Permalink to this headline">¶</a></h1>
<ul class="simple">
<li><a class="reference external" href="http://twitter.github.io/distributedlog/html/basics/quickstart.html">**Getting
Started**</a></li>
<li><a class="reference external" href="http://twitter.github.io/distributedlog/html/api/main.html">**API
References**</a></li>
<li><a class="reference external" href="http://twitter.github.io/distributedlog/html/tutorials/main.html">**Tutorials**</a></li>
</ul>
</div>
<div class="section" id="getting-involved">
<h1>Getting involved<a class="headerlink" href="#getting-involved" title="Permalink to this headline">¶</a></h1>
<ul class="simple">
<li>Website: <a class="reference external" href="https://twitter.github.io/distributedlog/html/">https://twitter.github.io/distributedlog/html/</a></li>
<li>Source: <a class="reference external" href="https://github.com/twitter/distributedlog">https://github.com/twitter/distributedlog</a></li>
<li>Maiing List:
<a class="reference external" href="https://groups.google.com/forum/#!forum/distributedlog-user">distributedlog-user&#64;googlegroups.com</a></li>
<li>Issue Tracker: <a class="reference external" href="https://github.com/twitter/distributedlog/issues">https://github.com/twitter/distributedlog/issues</a></li>
</ul>
<p>We feel that a welcoming community is important and we ask that you
follow Twitter's <a class="reference external" href="https://engineering.twitter.com/opensource/code-of-conduct">Open Source Code of
Conduct</a>
in all interactions with the community.</p>
</div>
<div class="section" id="authors">
<h1>Authors<a class="headerlink" href="#authors" title="Permalink to this headline">¶</a></h1>
<ul class="simple">
<li>Robin Dhamankar
(<a class="reference external" href="https://twitter.com/RobinDhamankar">&#64;RobinDhamankar</a>)</li>
<li>Sijie Guo (<a class="reference external" href="https://twitter.com/sijieg">&#64;sijieg</a>)</li>
<li>Leigh Stewart (<a class="reference external" href="https://twitter.com/l4stewar">&#64;l4stewar</a>)</li>
</ul>
<p>Thanks for assistance and contributions:</p>
<ul class="simple">
<li>Aniruddha Laud (<a class="reference external" href="https://twitter.com/i0exception">&#64;i0exception</a>)</li>
<li>Franck Cuny (<a class="reference external" href="https://twitter.com/franckcuny">&#64;franckcuny</a>)</li>
<li>Dave Rusek (<a class="reference external" href="https://twitter.com/davidjrusek">&#64;davidjrusek</a>)</li>
<li>Jordan Bull (<a class="reference external" href="https://twitter.com/jordangbull">&#64;jordangbull</a>)</li>
</ul>
<p>A full list of
<a class="reference external" href="https://github.com/twitter/distributedlog/graphs/contributors">contributors</a>
can be found on GitHub.</p>
</div>
<div class="section" id="license">
<h1>License<a class="headerlink" href="#license" title="Permalink to this headline">¶</a></h1>
<p>Copyright 2016 Twitter, Inc.</p>
<p>Licensed under the Apache License, Version 2.0:
<a class="reference external" href="http://www.apache.org/licenses/LICENSE-2.0">http://www.apache.org/licenses/LICENSE-2.0</a></p>
</div>
<div class="section" id="documentation">
<h1>Documentation<a class="headerlink" href="#documentation" title="Permalink to this headline">¶</a></h1>
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