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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.spark.storage
import scala.collection.mutable
import org.scalatest.{BeforeAndAfter, Matchers}
import org.apache.spark.{LocalSparkContext, SparkFunSuite}
class BlockReplicationPolicySuite extends SparkFunSuite
with Matchers
with BeforeAndAfter
with LocalSparkContext {
// Implicitly convert strings to BlockIds for test clarity.
private implicit def StringToBlockId(value: String): BlockId = new TestBlockId(value)
/**
* Test if we get the required number of peers when using random sampling from
* RandomBlockReplicationPolicy
*/
test(s"block replication - random block replication policy") {
val numBlockManagers = 10
val storeSize = 1000
val blockManagers = (1 to numBlockManagers).map { i =>
BlockManagerId(s"store-$i", "localhost", 1000 + i, None)
}
val candidateBlockManager = BlockManagerId("test-store", "localhost", 1000, None)
val replicationPolicy = new RandomBlockReplicationPolicy
val blockId = "test-block"
(1 to 10).foreach {numReplicas =>
logDebug(s"Num replicas : $numReplicas")
val randomPeers = replicationPolicy.prioritize(
candidateBlockManager,
blockManagers,
mutable.HashSet.empty[BlockManagerId],
blockId,
numReplicas
)
logDebug(s"Random peers : ${randomPeers.mkString(", ")}")
assert(randomPeers.toSet.size === numReplicas)
// choosing n peers out of n
val secondPass = replicationPolicy.prioritize(
candidateBlockManager,
randomPeers,
mutable.HashSet.empty[BlockManagerId],
blockId,
numReplicas
)
logDebug(s"Random peers : ${secondPass.mkString(", ")}")
assert(secondPass.toSet.size === numReplicas)
}
}
}
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