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| <div id="comment" class="fullcommenttop"><div class="comment cmt"><p>Helper class to simplify usage of <code>Dataset.observe(String, Column, Column*)</code>:</p><pre><span class="cmt">// Observe row count (rows) and highest id (maxid) in the Dataset while writing it</span> |
| <span class="kw">val</span> observation = Observation(<span class="lit">"my metrics"</span>) |
| <span class="kw">val</span> observed_ds = ds.observe(observation, count(lit(<span class="num">1</span>)).as(<span class="lit">"rows"</span>), max($<span class="lit">"id"</span>).as(<span class="lit">"maxid"</span>)) |
| observed_ds.write.parquet(<span class="lit">"ds.parquet"</span>) |
| <span class="kw">val</span> metrics = observation.get</pre><p>This collects the metrics while the first action is executed on the observed dataset. Subsequent |
| actions do not modify the metrics returned by <a href="#get:Map[String,_]" class="extmbr" name="org.apache.spark.sql.Observation#get">get</a>. Retrieval of the metric via <a href="#get:Map[String,_]" class="extmbr" name="org.apache.spark.sql.Observation#get">get</a> |
| blocks until the first action has finished and metrics become available.</p><p>This class does not support streaming datasets. |
| </p></div><dl class="attributes block"> <dt>Source</dt><dd><a href="https://github.com/apache/spark/tree/v3.4.3/sql/core/src/main/scala/org/apache/spark/sql/Observation.scala" target="_blank">Observation.scala</a></dd><dt>Since</dt><dd><p>3.3.0</p></dd></dl><div class="toggleContainer block"> |
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| |
| <p class="shortcomment cmt">(Scala-specific) Get the observed metrics.</p><div class="fullcomment"><div class="comment cmt"><p>(Scala-specific) Get the observed metrics. This waits for the observed dataset to finish |
| its first action. Only the result of the first action is available. Subsequent actions do not |
| modify the result. |
| </p></div><dl class="paramcmts block"><dt>returns</dt><dd class="cmt"><p>the observed metrics as a <code>Map[String, Any]</code></p></dd></dl><dl class="attributes block"> <dt>Annotations</dt><dd> |
| <span class="name">@throws</span><span class="args">(<span> |
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| <p class="shortcomment cmt">(Java-specific) Get the observed metrics.</p><div class="fullcomment"><div class="comment cmt"><p>(Java-specific) Get the observed metrics. This waits for the observed dataset to finish |
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