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[SPARK-15354][flaky-test] TopologyAwareBlockReplicationPolicyBehavior.Peers in 2 racks #17624

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[SPARK-15354][flaky-test] TopologyAwareBlockReplicationPolicyBehavior.Peers in 2 racks #17624

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13 changes: 11 additions & 2 deletions core/src/test/scala/org/apache/spark/storage/BlockReplicationPolicySuite.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -70,9 +70,18 @@ class RandomBlockReplicationPolicyBehavior extends SparkFunSuite
}
}

/**
* Returns a sequence of [[BlockManagerId]], whose rack is randomly picked from the given `racks`.
* Note that, each rack will be picked at least once from `racks`, if `count` is greater or equal
* to the number of `racks`.
*/
protected def generateBlockManagerIds(count: Int, racks: Seq[String]): Seq[BlockManagerId] = {
(1 to count).map{i =>
BlockManagerId(s"Exec-$i", s"Host-$i", 10000 + i, Some(racks(Random.nextInt(racks.size))))
val randomizedRacks: Seq[String] = Random.shuffle(
racks ++ racks.length.until(count).map(_ => racks(Random.nextInt(racks.length)))
)

(0 until count).map { i =>
BlockManagerId(s"Exec-$i", s"Host-$i", 10000 + i, Some(randomizedRacks(i)))
}
}
}
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