viirya commented on a change in pull request #33447:
URL: https://github.com/apache/spark/pull/33447#discussion_r674522297
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File path: project/SparkBuild.scala
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@@ -1197,7 +1197,7 @@ object TestSettings {
(Global / concurrentRestrictions) := {
// The number of concurrent test groups is empirically chosen based on
experience
// with Jenkins flakiness.
- if (sys.env.contains("SERIAL_SBT_TESTS")) (Global /
concurrentRestrictions).value
+ if (sys.env.contains("SERIAL_SBT_TESTS")) Seq(Tags.limit(Tags.Test, 1))
Review comment:
I'm not sure if `concurrentRestrictions` limits concurrent test to be 1.
We can revert this if this is not related.
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