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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2021/04/01 05:52:19 UTC

[GitHub] [spark] viirya commented on a change in pull request #31451: [SPARK-34338][SQL] Report metrics from Datasource v2 scan

viirya commented on a change in pull request #31451:
URL: https://github.com/apache/spark/pull/31451#discussion_r605392105



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File path: sql/catalyst/src/main/java/org/apache/spark/sql/connector/read/PartitionReader.java
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@@ -51,7 +51,8 @@
   T get();
 
   /**
-   * Returns an array of custom task metrics. By default it returns empty array.
+   * Returns an array of custom task metrics. By default it returns empty array. Note that it is
+   * not recommended to put heavy logic in this method as it may affect reading performance.

Review comment:
       If the iterator is not consumed to the end, doesn't it mean we will produce inaccurate metrics if it stops in the middle of 100?




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