uros-b commented on code in PR #56785:
URL: https://github.com/apache/spark/pull/56785#discussion_r3479768564
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resource-managers/yarn/src/test/scala/org/apache/spark/deploy/yarn/BaseYarnClusterSuite.scala:
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@@ -261,6 +269,15 @@ abstract class BaseYarnClusterSuite extends SparkFunSuite
with Matchers {
val props = new Properties()
props.put(SPARK_JARS.key, "local:" + fakeSparkJar.getAbsolutePath())
+ // On a busy CI runner the in-JVM mini cluster, the driver and the
container JVMs all compete
+ // for CPU, and the driver's RPC server occasionally cannot accept a
connection in time. With
+ // the default of 3 retries an executor that loses this race gives up and
exits, which leaves
+ // the application unable to finish and the suite times out. Give the
executor->driver
+ // connection a larger retry budget so a transient stall does not
permanently fail the app.
+ // These are defaults; individual tests can still override them via
extraConf below.
+ props.setProperty("spark.rpc.io.maxRetries", "10")
Review Comment:
Note: the new spark.rpc.io.* defaults are set via setProperty BEFORE the
loop that copies spark.* JVM system properties, so a -Dspark.rpc.io.maxRetries
flag would silently override them; the comment claims only extraConf can
override. Moving the two setProperty calls to just before extraConf.foreach
removes the ambiguity.
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