squito commented on a change in pull request #24554: [SPARK-27622][Core]
Avoiding the network when block manager fetches disk persisted RDD blocks from
the same host
URL: https://github.com/apache/spark/pull/24554#discussion_r289157242
##########
File path: core/src/test/scala/org/apache/spark/storage/BlockManagerSuite.scala
##########
@@ -567,6 +608,137 @@ class BlockManagerSuite extends SparkFunSuite with
Matchers with BeforeAndAfterE
assert(store.getRemoteBytes("list1").isEmpty)
}
+ Seq(
+ StorageLevel(useDisk = true, useMemory = false, deserialized = false),
+ StorageLevel(useDisk = true, useMemory = false, deserialized = true)
+ ).foreach { storageLevel =>
+ test(s"SPARK-27622: avoid the network when block requested from same host,
$storageLevel") {
+ conf.set("spark.shuffle.io.maxRetries", "0")
+ val noFetcher = new MockBlockTransferService(0) {
+ override def fetchBlockSync(
+ host: String,
+ port: Int,
+ execId: String,
+ blockId: String,
+ tempFileManager: DownloadFileManager): ManagedBuffer = {
+ fail("Fetching over network is not expected when the block is
requested from same host")
+ }
+ }
+ val store1 = makeBlockManager(8000, "executor1", this.master,
Some(noFetcher))
+ val store2 = makeBlockManager(8000, "executor2", this.master,
Some(noFetcher))
+ val blockId = "list"
+ val array = new Array[Byte](4000)
+ store2.putIterator(blockId, List(array).iterator, storageLevel, true)
+
+ // check getRemoteBytes
+ val bytesViaStore1 = store1.getRemoteBytes(blockId)
+ assert(bytesViaStore1.isDefined, "list expected to be accessed")
Review comment:
I'm not sure what this msg is supposed to mean. should it be "failed to get
data from another block manager on same host"? (or even no msg at all)
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