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package spark.network.netty
import java.io.File
import spark.Logging
private[spark] class ShuffleSender(val port: Int, val pResolver: PathResolver) extends Logging {
val server = new FileServer(pResolver)
Runtime.getRuntime().addShutdownHook(
new Thread() {
override def run() {
server.stop()
}
}
)
def start() {
server.run(port)
}
}
private[spark] object ShuffleSender {
def main(args: Array[String]) {
if (args.length < 3) {
System.err.println(
"Usage: ShuffleSender <port> <subDirsPerLocalDir> <list of shuffle_block_directories>")
System.exit(1)
}
val port = args(0).toInt
val subDirsPerLocalDir = args(1).toInt
val localDirs = args.drop(2).map(new File(_))
val pResovler = new PathResolver {
override def getAbsolutePath(blockId: String): String = {
if (!blockId.startsWith("shuffle_")) {
throw new Exception("Block " + blockId + " is not a shuffle block")
}
// Figure out which local directory it hashes to, and which subdirectory in that
val hash = math.abs(blockId.hashCode)
val dirId = hash % localDirs.length
val subDirId = (hash / localDirs.length) % subDirsPerLocalDir
val subDir = new File(localDirs(dirId), "%02x".format(subDirId))
val file = new File(subDir, blockId)
return file.getAbsolutePath
}
}
val sender = new ShuffleSender(port, pResovler)
sender.start()
}
}
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