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+# PIP 296: Support storing brokerClient certificates in Metadata Store
+
+# Background knowledge
+
+The use case is under configuring the geo-replication to a remote cluster with TLS enabled and will require
+setting `brokerClientTlsEnabled` as true and configuring the `brokerClientTrustCertsFilePath` when using
+the [createCluster](https://pulsar.apache.org/admin-rest-api/?version=2.11.0#operation/createCluster) API. But this is
+hard to maintain because users need to :
+
+* Users need to copy and deploy the destination cluster trusted TLS certificate file to the local cluster for each
+  broker.
+* Users need to make sure the destination cluster trusted TLS certificate file location is consistent with each broker.
+* Users need to record and maintain the certificate file path on brokers. Cleaning this location will impact the
+  geo-replication.
+
+# Motivation
+
+So, I am proposing to support uploading the TLS certificates on the `createCluster` API, and the broker can help store
+the destination cluster trusted TLS certificates in the metadata store since it's an existing data storage system. When
+the local cluster needs to connect to the destination cluster, local cluster brokers can extract the trusted TLS
+certificate file from the metadata store and set up the connection to the destination cluster.
+
+# Goals
+
+## In Scope
+
+* Introduce a new field `brokerClientTrustCerts=<schema>://<data>` to support multiple format of data. such as
+  file `file://<path>` or base64 encoded data `base64://<base64-encoded-data>`
+* Deprecate the `brokerClientTrustCertsFilePath` field.
+
+## Out of Scope
+
+None.
+
+# High-Level Design
+
+To support this proposal, we can add a `brokerClientTrustCerts` field to the `ClusterDataImpl`. And this PIP will be
+used like this way:
+
+1. Users need to set the `brokerClientTlsEnabled` as `True` and `brokerClientTrustCerts=<schema>://<data>` to enable
+   this feature and specify the TLS certificate trust certs file path or other data format.
+2. When the replicator in the Broker tries to set up the connection to the destination cluster, the broker can extract
+   the certificate in the target cluster metadata and decode it to use.
+3. The stored certificate should be cleaned together if the user deletes the destination cluster by the `deleteCluster`
+   API.
+
+# Detailed Design
+
+```mermaid
+sequenceDiagram
+    actor user
+    participant broker_service
+    participant replicator
+    participant cluster_test
+    user ->> broker_service: Add new destination cluster `{"name":"test", "brokerClientTrustCerts": "base64://sdfsadgasdgsadfgsdgsd", ...}`
+    replicator ->> broker_service: Fetch cluster test information and create replication producer.
+    replicator ->> cluster_test: Here are the messages for you.
+```
+
+The whole workflow is pretty straightforward as follows:
+
+1. User set `ClusterDataImpl` to broker by `createCluster` endpoint.
+2. Replicator gets `ClusterDataImpl` from metadata and creates a replication producer.
+3. Replicator replicates messages to the destination cluster.
+
+## Pulsar ClusterDataImpl
+
+```java
+
+@ApiModel(
+        value = "ClusterData",
+        description = "The configuration data for a cluster"
+)
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+@Slf4j
+public final class ClusterDataImpl implements ClusterData, Cloneable {
+    @ApiModelProperty(
+            name = "brokerClientTrustCertsFilePath",
+            value = "Path for the trusted TLS certificate file for outgoing connection to a server (broker)"
+    )
+    @Deprecated
+    private String brokerClientTrustCertsFilePath;
+
+    @ApiModelProperty(
+            name = "brokerClientTrustCerts",
+            value = "Trusted TLS certificate file for outgoing connection to a server (broker)"
+                    + "The format should be <schema>://<data>  e.g: file:///your/cert/path, base64://<base64-encoded>"
+    )
+    private String brokerClientTrustCerts;
+}
+```
+
+1. Deprecated the original field `brokerClientTrustCertsFilePath`.
+2. Add a new multiple format supported configuration field `brokerClientTrustCerts`.
+
+## Cli API
+
+1. Deprecated the original parameter `--tls-trust-certs-filepath`
+2. Adding a new parameter `--tls-trust-certs`
+
+# Backward & Forward Compatibility
+
+This PIP will keep compatibility.
+
+1. If `brokerClientTrustCertsFilePath` is null and `brokerClientTrustCerts` is not null. we will
+   adopt `brokerClientTrustCerts`
+2. If `brokerClientTrustCertsFilePath` is not null and `brokerClientTrustCerts` is null. we will
+   adopt `brokerClientTrustCertsFilePath`
+3. If both of `brokerClientTrustCertsFilePath` and `brokerClientTrustCerts` not null. we will
+   adopt `brokerClientTrustCerts`
+
+# Links
+
+* Mailing List discussion thread: https://lists.apache.org/thread/1r9hq2gxob801ttxypqvv8b2rxffzv80
+* Vote