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+# PIP-356: Support Geo-Replication starts at earliest position 
+
+# Background knowledge
+
+Replication reads messages from the source cluster, and copies them to the remote cluster.
+- Registers a cursor named `pulsar.repl.{remote-cluster}` on the source cluster. Replicator reads messages relies on this cursor.
+- Registers a producer on the remote cluster. Replicator writes messages relies on this producer.
+
+# Motivation
+
+If you have some older messages to migrate, the steps recommended are below, which was described at [pulsar doc](https://pulsar.apache.org/docs/3.2.x/administration-geo/#migrate-data-between-clusters-using-geo-replication).
+1. Create the cursor that the replicator will use manually: `pulsar-admin topics create-subscription -s pulsar.repl.{remote-cluster} -m earliest <topic>`.
+2. Enable namespace-level/topic-level Geo-Replication. 
+
+The steps recommended are difficultly to use, for example: 
+- Create cursor `pulsar.repl.{remote-cluster}` manually.
+- The namespace/topic was unloaded due to a re-balance.
+  - The broker will remove the `pulsar.repl.{remote-cluster}` automatically because the Geo-Replication feature is disabled at this moment.
+- Enable namespace-level/topic-level Geo-Replication, but the cursor that was created manually has been deleted, the broker will create a new one with latest position, which is not expected.
+
+
+# Goals
+Add an optional config(broker level, namespace level, and topic level) to support Geo-Replication starting at the earliest position.
+
+### Configuration
+
+**broker.conf**
+```properties
+# The position that replication task start at, it can be set to "earliest" or "latest (default)".
+replicationStartAt=latest
+```
+
+**ServiceConfiguration**
+```java
+@FieldContext(
+    category = CATEGORY_REPLICATION,
+    dynamic = true,
+    doc = "The position that replication task start at, it can be set to earliest or latest (default)."
+)
+String replicationStartAt = "latest";
+```
+
+### Public API
+
+**V2/Namespaces.java**
+```java
+@POST
+@Path("/{tenant}/{namespace}/replicationStartAt")
+public void setNamespaceLevelReplicationStartAt(
+    @PathParam("tenant") String tenant,
+    @PathParam("namespace") String namespace,
+    @QueryParam("replicationStartAt") String replicationStartAt) {
+    ...
+    ...
+}
+```
+
+**V2/PersistentTopics.java**
+```java
+@POST
+@Path("/{tenant}/{namespace}/{topic}/replicationStartAt")
+public void setNamespaceLevelReplicationStartAt(
+    @PathParam("tenant") String tenant,
+    @PathParam("namespace") String namespace,
+    @PathParam("topic") @Encoded String encodedTopic,
+    @QueryParam("isGlobal") @DefaultValue("false") boolean isGlobal,
+    @QueryParam("replicationStartAt") String replicationStartAt) {
+    ...
+    ...
+}
+```