1 files changed, 13 insertions, 0 deletions
diff --git a/core/src/main/scala/spark/Split.scala b/core/src/main/scala/spark/Split.scala
new file mode 100644
index 0000000000..116cd16370
--- /dev/null
+++ b/core/src/main/scala/spark/Split.scala
@@ -0,0 +1,13 @@
+package spark
+
+/**
+ * A partition of an RDD.
+ */
+@serializable trait Split {
+  /**
+   * Get a unique ID for this split which can be used, for example, to
+   * set up caches based on it. The ID should stay the same if we serialize
+   * and then deserialize the split.
+   */
+  def getId(): String
+}