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<h1 id="metrics-reporting">Metrics Reporting<a class="headerlink" href="#metrics-reporting" title="Permanent link">🔗</a></h1>
<p>As of 1.1.0 Iceberg supports the <a href="../../../javadoc/1.5.2/org/apache/iceberg/metrics/MetricsReporter.html"><code>MetricsReporter</code></a> and the <a href="../../../javadoc/1.5.2/org/apache/iceberg/metrics/MetricsReport.html"><code>MetricsReport</code></a> APIs. These two APIs allow expressing different metrics reports while supporting a pluggable way of reporting these reports.</p>
<h2 id="type-of-reports">Type of Reports<a class="headerlink" href="#type-of-reports" title="Permanent link">🔗</a></h2>
<h3 id="scanreport">ScanReport<a class="headerlink" href="#scanreport" title="Permanent link">🔗</a></h3>
<p>A <a href="../../../javadoc/1.5.2/org/apache/iceberg/metrics/ScanReport.html"><code>ScanReport</code></a> carries metrics being collected during scan planning against a given table. Amongst some general information about the involved table, such as the snapshot id or the table name, it includes metrics like:
* total scan planning duration
* number of data/delete files included in the result
* number of data/delete manifests scanned/skipped
* number of data/delete files scanned/skipped
* number of equality/positional delete files scanned</p>
<h3 id="commitreport">CommitReport<a class="headerlink" href="#commitreport" title="Permanent link">🔗</a></h3>
<p>A <a href="../../../javadoc/1.5.2/org/apache/iceberg/metrics/CommitReport.html"><code>CommitReport</code></a> carries metrics being collected after committing changes to a table (aka producing a snapshot). Amongst some general information about the involved table, such as the snapshot id or the table name, it includes metrics like:
* total duration
* number of attempts required for the commit to succeed
* number of added/removed data/delete files
* number of added/removed equality/positional delete files
* number of added/removed equality/positional deletes</p>
<h2 id="available-metrics-reporters">Available Metrics Reporters<a class="headerlink" href="#available-metrics-reporters" title="Permanent link">🔗</a></h2>
<h3 id="loggingmetricsreporter"><a href="../../../javadoc/1.5.2/org/apache/iceberg/metrics/LoggingMetricsReporter.html"><code>LoggingMetricsReporter</code></a><a class="headerlink" href="#loggingmetricsreporter" title="Permanent link">🔗</a></h3>
<p>This is the default metrics reporter when nothing else is configured and its purpose is to log results to the log file. Example output would look as shown below:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>INFO org.apache.iceberg.metrics.LoggingMetricsReporter - Received metrics report:
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a>ScanReport{
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a> tableName=scan-planning-with-eq-and-pos-delete-files,
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a> snapshotId=2,
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a> filter=ref(name=&quot;data&quot;) == &quot;(hash-27fa7cc0)&quot;,
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a> schemaId=0,
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a> projectedFieldIds=[1, 2],
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a> projectedFieldNames=[id, data],
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a> scanMetrics=ScanMetricsResult{
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a> totalPlanningDuration=TimerResult{timeUnit=NANOSECONDS, totalDuration=PT0.026569404S, count=1},
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<a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a> totalDataManifests=CounterResult{unit=COUNT, value=1},
<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a> totalDeleteManifests=CounterResult{unit=COUNT, value=1},
<a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a> scannedDataManifests=CounterResult{unit=COUNT, value=1},
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<a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></a> scannedDeleteManifests=CounterResult{unit=COUNT, value=1},
<a id="__codelineno-0-22" name="__codelineno-0-22" href="#__codelineno-0-22"></a> skippedDeleteManifests=CounterResult{unit=COUNT, value=0},
<a id="__codelineno-0-23" name="__codelineno-0-23" href="#__codelineno-0-23"></a> indexedDeleteFiles=CounterResult{unit=COUNT, value=2},
<a id="__codelineno-0-24" name="__codelineno-0-24" href="#__codelineno-0-24"></a> equalityDeleteFiles=CounterResult{unit=COUNT, value=1},
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<a id="__codelineno-0-26" name="__codelineno-0-26" href="#__codelineno-0-26"></a> metadata={
<a id="__codelineno-0-27" name="__codelineno-0-27" href="#__codelineno-0-27"></a> iceberg-version=Apache Iceberg 1.4.0-SNAPSHOT (commit 4868d2823004c8c256a50ea7c25cff94314cc135)}}
</code></pre></div>
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>INFO org.apache.iceberg.metrics.LoggingMetricsReporter - Received metrics report:
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>CommitReport{
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a> tableName=scan-planning-with-eq-and-pos-delete-files,
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a> snapshotId=1,
<a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a> sequenceNumber=1,
<a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a> operation=append,
<a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a> commitMetrics=CommitMetricsResult{
<a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a> totalDuration=TimerResult{timeUnit=NANOSECONDS, totalDuration=PT0.098429626S, count=1},
<a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a> attempts=CounterResult{unit=COUNT, value=1},
<a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a> addedDataFiles=CounterResult{unit=COUNT, value=1},
<a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a> removedDataFiles=null,
<a id="__codelineno-1-12" name="__codelineno-1-12" href="#__codelineno-1-12"></a> totalDataFiles=CounterResult{unit=COUNT, value=1},
<a id="__codelineno-1-13" name="__codelineno-1-13" href="#__codelineno-1-13"></a> addedDeleteFiles=null,
<a id="__codelineno-1-14" name="__codelineno-1-14" href="#__codelineno-1-14"></a> addedEqualityDeleteFiles=null,
<a id="__codelineno-1-15" name="__codelineno-1-15" href="#__codelineno-1-15"></a> addedPositionalDeleteFiles=null,
<a id="__codelineno-1-16" name="__codelineno-1-16" href="#__codelineno-1-16"></a> removedDeleteFiles=null,
<a id="__codelineno-1-17" name="__codelineno-1-17" href="#__codelineno-1-17"></a> removedEqualityDeleteFiles=null,
<a id="__codelineno-1-18" name="__codelineno-1-18" href="#__codelineno-1-18"></a> removedPositionalDeleteFiles=null,
<a id="__codelineno-1-19" name="__codelineno-1-19" href="#__codelineno-1-19"></a> totalDeleteFiles=CounterResult{unit=COUNT, value=0},
<a id="__codelineno-1-20" name="__codelineno-1-20" href="#__codelineno-1-20"></a> addedRecords=CounterResult{unit=COUNT, value=1},
<a id="__codelineno-1-21" name="__codelineno-1-21" href="#__codelineno-1-21"></a> removedRecords=null,
<a id="__codelineno-1-22" name="__codelineno-1-22" href="#__codelineno-1-22"></a> totalRecords=CounterResult{unit=COUNT, value=1},
<a id="__codelineno-1-23" name="__codelineno-1-23" href="#__codelineno-1-23"></a> addedFilesSizeInBytes=CounterResult{unit=BYTES, value=10},
<a id="__codelineno-1-24" name="__codelineno-1-24" href="#__codelineno-1-24"></a> removedFilesSizeInBytes=null,
<a id="__codelineno-1-25" name="__codelineno-1-25" href="#__codelineno-1-25"></a> totalFilesSizeInBytes=CounterResult{unit=BYTES, value=10},
<a id="__codelineno-1-26" name="__codelineno-1-26" href="#__codelineno-1-26"></a> addedPositionalDeletes=null,
<a id="__codelineno-1-27" name="__codelineno-1-27" href="#__codelineno-1-27"></a> removedPositionalDeletes=null,
<a id="__codelineno-1-28" name="__codelineno-1-28" href="#__codelineno-1-28"></a> totalPositionalDeletes=CounterResult{unit=COUNT, value=0},
<a id="__codelineno-1-29" name="__codelineno-1-29" href="#__codelineno-1-29"></a> addedEqualityDeletes=null,
<a id="__codelineno-1-30" name="__codelineno-1-30" href="#__codelineno-1-30"></a> removedEqualityDeletes=null,
<a id="__codelineno-1-31" name="__codelineno-1-31" href="#__codelineno-1-31"></a> totalEqualityDeletes=CounterResult{unit=COUNT, value=0}},
<a id="__codelineno-1-32" name="__codelineno-1-32" href="#__codelineno-1-32"></a> metadata={
<a id="__codelineno-1-33" name="__codelineno-1-33" href="#__codelineno-1-33"></a> iceberg-version=Apache Iceberg 1.4.0-SNAPSHOT (commit 4868d2823004c8c256a50ea7c25cff94314cc135)}}
</code></pre></div>
<h3 id="restmetricsreporter"><a href="../../javadoc/1.5.2/org/apache/iceberg/rest/RESTMetricsReporter.html"><code>RESTMetricsReporter</code></a><a class="headerlink" href="#restmetricsreporter" title="Permanent link">🔗</a></h3>
<p>This is the default when using the <a href="../../../javadoc/1.5.2/org/apache/iceberg/rest/RESTCatalog.html"><code>RESTCatalog</code></a> and its purpose is to send metrics to a REST server at the <code>/v1/{prefix}/namespaces/{namespace}/tables/{table}/metrics</code> endpoint as defined in the <a href="https://github.com/apache/iceberg/blob/main/open-api/rest-catalog-open-api.yaml">REST OpenAPI spec</a>.</p>
<p>Sending metrics via REST can be controlled with the <code>rest-metrics-reporting-enabled</code> (defaults to <code>true</code>) property.</p>
<h2 id="implementing-a-custom-metrics-reporter">Implementing a custom Metrics Reporter<a class="headerlink" href="#implementing-a-custom-metrics-reporter" title="Permanent link">🔗</a></h2>
<p>Implementing the <a href="../../../javadoc/1.5.2/org/apache/iceberg/metrics/MetricsReporter.html"><code>MetricsReporter</code></a> API gives full flexibility in dealing with incoming <a href="../../../javadoc/1.5.2/org/apache/iceberg/metrics/MetricsReport.html"><code>MetricsReport</code></a> instances. For example, it would be possible to send results to a Prometheus endpoint or any other observability framework/system.</p>
<p>Below is a short example illustrating an <code>InMemoryMetricsReporter</code> that stores reports in a list and makes them available:
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="kd">public</span><span class="w"> </span><span class="kd">class</span> <span class="nc">InMemoryMetricsReporter</span><span class="w"> </span><span class="kd">implements</span><span class="w"> </span><span class="n">MetricsReporter</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>
<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="n">List</span><span class="o">&lt;</span><span class="n">MetricsReport</span><span class="o">&gt;</span><span class="w"> </span><span class="n">metricsReports</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Lists</span><span class="p">.</span><span class="na">newArrayList</span><span class="p">();</span>
<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a>
<a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="w"> </span><span class="nd">@Override</span>
<a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">report</span><span class="p">(</span><span class="n">MetricsReport</span><span class="w"> </span><span class="n">report</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a><span class="w"> </span><span class="n">metricsReports</span><span class="p">.</span><span class="na">add</span><span class="p">(</span><span class="n">report</span><span class="p">);</span>
<a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a>
<a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a><span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="n">List</span><span class="o">&lt;</span><span class="n">MetricsReport</span><span class="o">&gt;</span><span class="w"> </span><span class="nf">reports</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">metricsReports</span><span class="p">;</span>
<a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a><span class="w"> </span><span class="p">}</span>
<a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a><span class="p">}</span>
</code></pre></div></p>
<h2 id="registering-a-custom-metrics-reporter">Registering a custom Metrics Reporter<a class="headerlink" href="#registering-a-custom-metrics-reporter" title="Permanent link">🔗</a></h2>
<h3 id="via-catalog-configuration">Via Catalog Configuration<a class="headerlink" href="#via-catalog-configuration" title="Permanent link">🔗</a></h3>
<p>The <a href="../configuration/#catalog-properties">catalog property</a> <code>metrics-reporter-impl</code> allows registering a given <a href="../../../javadoc/1.5.2/org/apache/iceberg/metrics/MetricsReporter.html"><code>MetricsReporter</code></a> by specifying its fully-qualified class name, e.g. <code>metrics-reporter-impl=org.apache.iceberg.metrics.InMemoryMetricsReporter</code>.</p>
<h3 id="via-the-java-api-during-scan-planning">Via the Java API during Scan planning<a class="headerlink" href="#via-the-java-api-during-scan-planning" title="Permanent link">🔗</a></h3>
<p>Independently of the <a href="../../../javadoc/1.5.2/org/apache/iceberg/metrics/MetricsReporter.html"><code>MetricsReporter</code></a> being registered at the catalog level via the <code>metrics-reporter-impl</code> property, it is also possible to supply additional reporters during scan planning as shown below:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="n">TableScan</span><span class="w"> </span><span class="n">tableScan</span><span class="w"> </span><span class="o">=</span><span class="w"> </span>
<a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="w"> </span><span class="n">table</span>
<a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="w"> </span><span class="p">.</span><span class="na">newScan</span><span class="p">()</span>
<a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="w"> </span><span class="p">.</span><span class="na">metricsReporter</span><span class="p">(</span><span class="n">customReporterOne</span><span class="p">)</span>
<a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="w"> </span><span class="p">.</span><span class="na">metricsReporter</span><span class="p">(</span><span class="n">customReporterTwo</span><span class="p">);</span>
<a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a>
<a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a><span class="k">try</span><span class="w"> </span><span class="p">(</span><span class="n">CloseableIterable</span><span class="o">&lt;</span><span class="n">FileScanTask</span><span class="o">&gt;</span><span class="w"> </span><span class="n">fileScanTasks</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">tableScan</span><span class="p">.</span><span class="na">planFiles</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a><span class="w"> </span><span class="c1">// ...</span>
<a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a><span class="p">}</span>
</code></pre></div>
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