attilapiros commented on a change in pull request #23614:
[SPARK-26689][CORE]Support blacklisting bad disk directory and retry in
DiskBlockManager
URL: https://github.com/apache/spark/pull/23614#discussion_r253491424
##########
File path: core/src/main/scala/org/apache/spark/storage/DiskBlockManager.scala
##########
@@ -48,32 +56,69 @@ private[spark] class DiskBlockManager(conf: SparkConf,
deleteFilesOnStop: Boolea
// of subDirs(i) is protected by the lock of subDirs(i)
private val subDirs = Array.fill(localDirs.length)(new
Array[File](subDirsPerLocalDir))
+ private[spark] val badDirs = ArrayBuffer[File]()
+ private[spark] val dirToBlacklistExpiryTime = new HashMap[File, Long]
+ // Filename hash to dirId, it should be small enough to put into memory
+ private[spark] val migratedDirIdIndex = new ConcurrentHashMap[Int,
Int].asScala
+
private val shutdownHook = addShutdownHook()
/** Looks up a file by hashing it into one of our local subdirectories. */
// This method should be kept in sync with
// org.apache.spark.network.shuffle.ExternalShuffleBlockResolver#getFile().
def getFile(filename: String): File = {
+ var mostRecentFailure: Exception = null
// Figure out which local directory it hashes to, and which subdirectory
in that
val hash = Utils.nonNegativeHash(filename)
- val dirId = hash % localDirs.length
+ val dirId = migratedDirIdIndex.getOrElse(hash, hash % localDirs.length)
Review comment:
Collisions can happen, like
```
scala> val s = for (i <- 1 to 100; j <- 1 to 100; k <- 1 to 100) yield
Math.abs(("shuffle_" + i + "_" + j + "_" + k + ".index").hashCode)
scala> s.size
res29: Int = 1000000
scala> s.toSet.size
res30: Int = 999964
```
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