Github user aarondav commented on a diff in the pull request:
https://github.com/apache/spark/pull/1486#discussion_r17769055
--- Diff: core/src/main/scala/org/apache/spark/scheduler/TaskLocation.scala
---
@@ -22,13 +22,35 @@ package org.apache.spark.scheduler
* In the latter case, we will prefer to launch the task on that
executorID, but our next level
* of preference will be executors on the same host if this is not
possible.
*/
-private[spark]
-class TaskLocation private (val host: String, val executorId:
Option[String]) extends Serializable {
- override def toString: String = "TaskLocation(" + host + ", " +
executorId + ")"
+private[spark] sealed abstract class TaskLocation(val host: String) {
+}
+
+private [spark] case class ExecutorCacheTaskLocation(override val host:
String,
+ val executorId: String) extends TaskLocation(host) {
+}
+
+private [spark] case class HDFSCachedTaskLocation(override val host:
String)
+ extends TaskLocation(host) {
+ override def toString = TaskLocation.in_memory_location_tag + host
+}
+
+private [spark] case class HostTaskLocation(override val host: String)
extends TaskLocation(host) {
+ override def toString = host
}
private[spark] object TaskLocation {
- def apply(host: String, executorId: String) = new TaskLocation(host,
Some(executorId))
+ // We identify hosts on which the block is cached with this prefix.
Because this prefix contains
+ // underscores, which are not legal characters in hostnames, there
should be no potential for
+ // confusion. See RFC 952 and RFC 1123 for information about the
format of hostnames.
+ val in_memory_location_tag = "_hdfs_cache_"
+
+ def apply(host: String, executorId: String) = new
ExecutorCacheTaskLocation(host, executorId)
- def apply(host: String) = new TaskLocation(host, None)
+ def apply(str: String) = {
+ if (str.startsWith(in_memory_location_tag)) {
+ new
HDFSCachedTaskLocation(str.substring(in_memory_location_tag.length))
--- End diff --
nit: `str.stripPrefix(in_memory_location_tag)`
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