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<h1 class="title">Apache BookKeeper&trade; 4.13.0</h1>
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<p>This documentation is for Apache BookKeeper™ version 4.13.0.</p>
<p>Apache BookKeeper™ is a scalable, fault-tolerant, low-latency storage service optimized for real-time workloads. It offers durability, replication, and strong consistency as essentials for building reliable real-time applications.</p>
<p>BookKeeper is suitable for a wide variety of use cases, including:</p>
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<td style="text-align: left"><a href="https://en.wikipedia.org/wiki/Write-ahead_logging">WAL</a> (write-ahead logging)</td>
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<td style="text-align: left"><a href="https://en.wikipedia.org/wiki/Write-ahead_logging">WAL</a> (write-ahead logging)</td>
<td style="text-align: left">Twitter <a href="https://blog.twitter.com/engineering/en_us/a/2016/strong-consistency-in-manhattan.html">Manhattan</a></td>
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<td style="text-align: left"><a href="https://en.wikipedia.org/wiki/Write-ahead_logging">WAL</a> (write-ahead logging)</td>
<td style="text-align: left"><a href="https://github.com/diennea/herddb">HerdDB</a></td>
</tr>
<tr>
<td style="text-align: left">Message storage</td>
<td style="text-align: left"><a href="http://pulsar.incubator.apache.org/docs/latest/getting-started/ConceptsAndArchitecture/#persistent-storage">Apache Pulsar</a></td>
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<td style="text-align: left">Offset/cursor storage</td>
<td style="text-align: left"><a href="http://pulsar.incubator.apache.org/docs/latest/getting-started/ConceptsAndArchitecture/#persistent-storage">Apache Pulsar</a></td>
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<td style="text-align: left">Object/<a href="https://en.wikipedia.org/wiki/Binary_large_object">BLOB</a> storage</td>
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<p>Learn more about Apache BookKeeper™ and what it can do for your organization:</p>
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<li><a href="../releaseNotes">Apache BookKeeper 4.13.0 Release Notes</a></li>
<li><a href="../../api/javadoc">Java API docs</a></li>
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<p>Or start <a href="../../getting-started/installation">using</a> Apache BookKeeper today.</p>
<h3 id="users">Users</h3>
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<li><strong>Concepts</strong>: Start with <a href="../../getting-started/concepts">concepts</a>. This will help you to fully understand
the other parts of the documentation, including the setup, integration and operation guides.</li>
<li><strong>Getting Started</strong>: Install <a href="../../getting-started/installation">Apache BookKeeper</a> and run bookies <a href="../../getting-started/run-locally">locally</a></li>
<li><strong>API</strong>: Read the <a href="../../api/overview">API</a> documentation to learn how to use Apache BookKeeper to build your applications.</li>
<li><strong>Deployment</strong>: The <a href="../../deployment/manual">Deployment Guide</a> shows how to deploy Apache BookKeeper to production clusters.</li>
</ul>
<h3 id="administrators">Administrators</h3>
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<li><strong>Operations</strong>: The <a href="../../admin/bookies">Admin Guide</a> shows how to run Apache BookKeeper on production, what are the production
considerations and best practices.</li>
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<h3 id="contributors">Contributors</h3>
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<li><strong>Details</strong>: Learn <a href="../../development/protocol">design details</a> to know more internals.</li>
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<h2 class="title">Apache BookKeeper&trade; 4.13.0</h2>
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</div>
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<p>An entry is a sequence of bytes (plus some metadata) written to a BookKeeper ledger. Entries are also known as records.</p>
</div>
<div id="ledger-popover-html" class="popover-template">
<p>A ledger is a sequence of entries written to BookKeeper. Entries are written sequentially to ledgers and at most once, giving ledgers append-only semantics.</p>
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<p>A bookie is an individual BookKeeper storage server.</p>
<p>Bookies store the content of ledgers and act as a distributed ensemble.</p>
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<p>A subsystem that runs in the background on bookies to ensure that ledgers are fully replicated even if one bookie from the ensemble is down.</p>
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<p>Striping is the process of distributing BookKeeper ledgers to sub-groups of bookies rather than to all bookies in a BookKeeper ensemble.</p>
<p>Striping is essential to ensuring fast performance.</p>
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<p>Striping is the process of distributing BookKeeper ledgers to sub-groups of bookies rather than to all bookies in a BookKeeper ensemble.</p>
<p>Striping is essential to ensuring fast performance.</p>
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<p>A journal file stores BookKeeper transaction logs.</p>
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<p>When a reader forces a ledger to close, preventing any further entries from being written to the ledger.</p>
</div>
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<p>A record is a sequence of bytes (plus some metadata) written to a BookKeeper ledger. Records are also known as entries.</p>
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