public Builder setPrimaryInstance(
        com.google.cloud.memorystore.v1.CrossInstanceReplicationConfig.RemoteInstance value) {
      if (primaryInstanceBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        primaryInstance_ = value;
      } else {
        primaryInstanceBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00000002;
      onChanged();
      return this;
    }
<pre>
Optional. Details of the primary instance that is used as the replication
source for this secondary instance.

This field is only set for a secondary instance.
</pre>

<code>
.google.cloud.memorystore.v1.CrossInstanceReplicationConfig.RemoteInstance primary_instance = 2 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-valkey/proto-google-cloud-valkey-v1/src/main/java/com/google/cloud/memorystore/v1/CrossInstanceReplicationConfig.java