Github user tashoyan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19700#discussion_r150052324
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/ui/SQLListener.scala ---
@@ -101,6 +101,8 @@ class SQLListener(conf: SparkConf) extends
SparkListener with Logging {
private val retainedExecutions =
conf.getInt("spark.sql.ui.retainedExecutions", 1000)
+ private val retainedStages = conf.getInt("spark.ui.retainedStages", 1000)
--- End diff --
@dongjoon-hyun , It is already documented in the same file configuration.md:
```
How many stages the Spark UI and status APIs remember before garbage
collecting.
This is a target maximum, and fewer elements may be retained in some
circumstances.
```
I did not involve a new parameter, I just used an existing one.
Regarding renaming to `spark.sql.ui.retainedStages`, I believe it should be
done in a separate pull request - if should. This parameter is also used in
other parts of Spark code, not only SQL.
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