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| <h1 class="title">Metric collection</h1> |
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| <p>BookKeeper enables metrics collection through a variety of <a href="#stats-providers">stats providers</a>.</p> |
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| <h2 id="stats-providers">Stats providers</h2> |
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| <p>BookKeeper has stats provider implementations for these sinks:</p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th style="text-align: left">Provider</th> |
| <th style="text-align: left">Provider class name</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td style="text-align: left"><a href="https://mvnrepository.com/artifact/org.apache.bookkeeper.stats/codahale-metrics-provider">Codahale Metrics</a></td> |
| <td style="text-align: left"><code class="highlighter-rouge">org.apache.bookkeeper.stats.CodahaleMetricsProvider</code></td> |
| </tr> |
| <tr> |
| <td style="text-align: left"><a href="https://prometheus.io/">Prometheus</a></td> |
| <td style="text-align: left"><code class="highlighter-rouge">org.apache.bookkeeper.stats.prometheus.PrometheusMetricsProvider</code></td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <blockquote> |
| <p>The <a href="https://github.com/apache/bookkeeper/tree/master/bookkeeper-stats-providers/codahale-metrics-provider">Codahale Metrics</a> stats provider is the default provider.</p> |
| </blockquote> |
| |
| <h2 id="enabling-stats-providers-in-bookies">Enabling stats providers in bookies</h2> |
| |
| <p>Two stats-related <a href="../../reference/config/">configuration parameters</a> are available for bookies:</p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th style="text-align: left">Parameter</th> |
| <th style="text-align: left">Description</th> |
| <th style="text-align: left">Default</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td style="text-align: left"><code class="highlighter-rouge">enableStatistics</code></td> |
| <td style="text-align: left">Whether statistics are enabled for the bookie</td> |
| <td style="text-align: left"><code class="highlighter-rouge">false</code></td> |
| </tr> |
| <tr> |
| <td style="text-align: left"><code class="highlighter-rouge">statsProviderClass</code></td> |
| <td style="text-align: left">The stats provider class used by the bookie</td> |
| <td style="text-align: left"><code class="highlighter-rouge">org.apache.bookkeeper.stats.CodahaleMetricsProvider</code></td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <p>To enable stats:</p> |
| |
| <ul> |
| <li>set the <code class="highlighter-rouge">enableStatistics</code> parameter to <code class="highlighter-rouge">true</code></li> |
| <li>set <code class="highlighter-rouge">statsProviderClass</code> to the desired provider (see the <a href="#stats-providers">table above</a> for a listing of classes)</li> |
| </ul> |
| |
| <!-- ## Enabling stats in the bookkeeper library |
| |
| TODO |
| --> |
| |
| </section> |
| |
| |
| </div> |
| </div> |
| |
| <div class="column is-2 is-hidden-mobile"> |
| |
| |
| <div class="toc"> |
| <h2 class="title">Metric collection</h2> |
| <ul class="section-nav"> |
| <li class="toc-entry toc-h2"><a href="#stats-providers">Stats providers</a></li> |
| <li class="toc-entry toc-h2"><a href="#enabling-stats-providers-in-bookies">Enabling stats providers in bookies</a></li> |
| </ul> |
| </div> |
| |
| |
| |
| </div> |
| </div> |
| </div> |
| |
| |
| |
| <div id="entry-popover-html" class="popover-template"> |
| <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> |
| |
| </div> |
| |
| <div id="bookie-popover-html" class="popover-template"> |
| <p>A bookie is an individual BookKeeper storage server.</p> |
| |
| <p>Bookies store the content of ledgers and act as a distributed ensemble.</p> |
| |
| </div> |
| |
| <div id="rereplication-popover-html" class="popover-template"> |
| <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> |
| |
| </div> |
| |
| <div id="striping-popover-html" class="popover-template"> |
| <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> |
| |
| </div> |
| |
| <div id="striped-popover-html" class="popover-template"> |
| <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> |
| |
| </div> |
| |
| <div id="journal-popover-html" class="popover-template"> |
| <p>A journal file stores BookKeeper transaction logs.</p> |
| |
| </div> |
| |
| <div id="fencing-popover-html" class="popover-template"> |
| <p>When a reader forces a ledger to close, preventing any further entries from being written to the ledger.</p> |
| |
| </div> |
| |
| <div id="record-popover-html" class="popover-template"> |
| <p>A record is a sequence of bytes (plus some metadata) written to a BookKeeper ledger. Records are also known as entries.</p> |
| |
| </div> |
| |
| |
| <script type="text/javascript"> |
| |
| tippy('#entry-popover', { |
| html: '#entry-popover-html', |
| arrow: true, |
| animation: 'fade' |
| }); |
| |
| tippy('#ledger-popover', { |
| html: '#ledger-popover-html', |
| arrow: true, |
| animation: 'fade' |
| }); |
| |
| tippy('#bookie-popover', { |
| html: '#bookie-popover-html', |
| arrow: true, |
| animation: 'fade' |
| }); |
| |
| tippy('#rereplication-popover', { |
| html: '#rereplication-popover-html', |
| arrow: true, |
| animation: 'fade' |
| }); |
| |
| tippy('#striping-popover', { |
| html: '#striping-popover-html', |
| arrow: true, |
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