[SPARK-48268][CORE] Add a configuration for SparkContext.setCheckpointDir

core/src/main/scala/org/apache/spark/SparkContext.scala

@@ -374,6 +374,7 @@ class SparkContext(config: SparkConf) extends Logging {
   private[spark] def cleaner: Option[ContextCleaner] = _cleaner
 
   private[spark] var checkpointDir: Option[String] = None
+  config.getOption(CHECKPOINT_DIR.key).foreach(setCheckpointDir)
 
   // Thread Local variable that can be used by users to pass information down the stack
   protected[spark] val localProperties = new InheritableThreadLocal[Properties] {

core/src/main/scala/org/apache/spark/internal/config/package.scala

@@ -1317,6 +1317,16 @@ package object config {
           s" be less than or equal to ${ByteArrayMethods.MAX_ROUNDED_ARRAY_LENGTH}.")
       .createWithDefault(64 * 1024 * 1024)
 
+  private[spark] val CHECKPOINT_DIR =
+    ConfigBuilder("spark.checkpoint.dir")
+      .doc(
+        "Equivalent with SparkContext.setCheckpointDir. If set, the path becomes" +
+          "the default directory for checkpointing. It can be overwritten by" +
+          "SparkContext.setCheckpointDir.")
+      .version("4.0.0")
+      .stringConf
+      .createOptional
+
   private[spark] val CHECKPOINT_COMPRESS =
     ConfigBuilder("spark.checkpoint.compress")
       .doc("Whether to compress RDD checkpoints. Generally a good idea. Compression will use " +

docs/configuration.md

@@ -1795,6 +1795,16 @@ Apart from these, the following properties are also available, and may be useful
   </td>
   <td>0.6.0</td>
 </tr>
+<tr>
+  <td><code>spark.checkpoint.dir</code></td>
+  <td>(none)</td>
+  <td>
+    Equivalent with SparkContext.setCheckpointDir. If set, the path becomes
+    the default directory for checkpointing. It can be overwritten by
+    SparkContext.setCheckpointDir.
+  </td>
+  <td>4.0.0</td>
+</tr>
 <tr>
   <td><code>spark.checkpoint.compress</code></td>
   <td>false</td>