yaooqinn commented on code in PR #47533:
URL: https://github.com/apache/spark/pull/47533#discussion_r1696716244
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/StaticSQLConf.scala:
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@@ -170,6 +170,16 @@ object StaticSQLConf {
.intConf
.createWithDefault(1000)
+ val SHUFFLE_EXCHANGE_MAX_THREAD_THRESHOLD =
+ buildStaticConf("spark.sql.shuffleExchange.maxThreadThreshold")
+ .internal()
+ .doc("The maximum degree of parallelism for doing preparation of shuffle
exchange, " +
+ "which includes subquery execution, file listing, etc.")
+ .version("4.0.0")
+ .intConf
+ .checkValue(thres => thres > 0 && thres <= 1024, "The threshold must be
in (0,1024].")
+ .createWithDefault(1024)
Review Comment:
Can you explain why we pick this number? It might create memory pressure on
the driver
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