add client id for all metadata listening clients

other/java/client/src/main/java/seaweedfs/client/FilerClient.java

@@ -368,6 +368,7 @@ public class FilerClient extends FilerGrpcClient {
                 .setPathPrefix(prefix)
                 .setClientName(clientName)
                 .setSinceNs(sinceNs)
+                .setClientId(this.randomClientId)
                 .build()
         );
     }

other/java/client/src/main/java/seaweedfs/client/FilerGrpcClient.java

@@ -11,6 +11,7 @@ import org.slf4j.LoggerFactory;
 import javax.net.ssl.SSLException;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Random;
 import java.util.concurrent.TimeUnit;
 
 public class FilerGrpcClient {
@@ -30,6 +31,7 @@ public class FilerGrpcClient {
     public final int VOLUME_SERVER_ACCESS_PUBLIC_URL = 1;
     public final int VOLUME_SERVER_ACCESS_FILER_PROXY = 2;
     public final Map<String, FilerProto.Locations> vidLocations = new HashMap<>();
+    protected int randomClientId;
     private final ManagedChannel channel;
     private final SeaweedFilerGrpc.SeaweedFilerBlockingStub blockingStub;
     private final SeaweedFilerGrpc.SeaweedFilerStub asyncStub;
@@ -62,6 +64,7 @@ public class FilerGrpcClient {
         cipher = filerConfigurationResponse.getCipher();
         collection = filerConfigurationResponse.getCollection();
         replication = filerConfigurationResponse.getReplication();
+        randomClientId = new Random().nextInt();
 
     }
 

other/java/client/src/main/proto/filer.proto

@@ -329,6 +329,7 @@ message SubscribeMetadataRequest {
     int64 since_ns = 3;
     int32 signature = 4;
     repeated string path_prefixes = 6;
+    int32 client_id = 7;
 }
 message SubscribeMetadataResponse {
     string directory = 1;