maryannxue commented on a change in pull request #27669: [SPARK-30918][SQL]
improve the splitting of skewed partitions
URL: https://github.com/apache/spark/pull/27669#discussion_r382669699
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/OptimizeSkewedJoin.scala
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@@ -34,6 +34,29 @@ import
org.apache.spark.sql.execution.exchange.{EnsureRequirements, ShuffleExcha
import org.apache.spark.sql.execution.joins.SortMergeJoinExec
import org.apache.spark.sql.internal.SQLConf
+/**
+ * A rule to optimize skewed joins to avoid one or a little tasks processing
most of the data.
Review comment:
A rule to optimize skewed joins to avoid straggler tasks whose share of data
are significantly larger than those of the rest of the tasks.
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