kiszk commented on a change in pull request #24585: [Spark-27664][CORE]
Performance issue while listing large number of files on an object store.
URL: https://github.com/apache/spark/pull/24585#discussion_r283588413
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
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@@ -585,6 +585,17 @@ object SQLConf {
.longConf
.createWithDefault(250 * 1024 * 1024)
+ val HIVE_FILESOURCE_FILE_CACHE_CONCURRENCY_LEVEL =
+ buildConf("spark.sql.hive.filesourceFileCacheConcurrencyLevel")
+ .doc("Provide concurrency level for underlying guava cache. The default
is 1." +
+ " Higher value may give better performance, when the number of " +
Review comment:
We would like to see the evidence (i.e. multiple experimental results) to
change the default value.
Why do we need to change the default value in addition to making this
parameter changeable?
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