diff --git a/hugegraph-pd/hg-pd-core/src/main/java/org/apache/hugegraph/pd/meta/LogMeta.java b/hugegraph-pd/hg-pd-core/src/main/java/org/apache/hugegraph/pd/meta/LogMeta.java
index ee791d5e04..90e042dc2b 100644
--- a/hugegraph-pd/hg-pd-core/src/main/java/org/apache/hugegraph/pd/meta/LogMeta.java
+++ b/hugegraph-pd/hg-pd-core/src/main/java/org/apache/hugegraph/pd/meta/LogMeta.java
@@ -25,11 +25,9 @@
 
 public class LogMeta extends MetadataRocksDBStore {
 
-    private final PDConfig pdConfig;
 
     public LogMeta(PDConfig pdConfig) {
         super(pdConfig);
-        this.pdConfig = pdConfig;
     }
 
     public void insertLog(Metapb.LogRecord record) throws PDException {
diff --git a/hugegraph-pd/hg-pd-core/src/main/java/org/apache/hugegraph/pd/meta/PartitionMeta.java b/hugegraph-pd/hg-pd-core/src/main/java/org/apache/hugegraph/pd/meta/PartitionMeta.java
index 2952a1725d..599d5f5c9e 100644
--- a/hugegraph-pd/hg-pd-core/src/main/java/org/apache/hugegraph/pd/meta/PartitionMeta.java
+++ b/hugegraph-pd/hg-pd-core/src/main/java/org/apache/hugegraph/pd/meta/PartitionMeta.java
@@ -35,12 +35,10 @@ public class PartitionMeta extends MetadataRocksDBStore {
 
     static String CID_GRAPH_ID_KEY = "GraphID";
     static int CID_GRAPH_ID_MAX = 0xFFFE;
-    private final PDConfig pdConfig;
     private final PartitionCache cache;
 
     public PartitionMeta(PDConfig pdConfig) {
         super(pdConfig);
-        this.pdConfig = pdConfig;
         //this.timeout = pdConfig.getEtcd().getTimeout();
         this.cache = new PartitionCache();
     }
diff --git a/hugegraph-pd/hg-pd-core/src/main/java/org/apache/hugegraph/pd/meta/StoreInfoMeta.java b/hugegraph-pd/hg-pd-core/src/main/java/org/apache/hugegraph/pd/meta/StoreInfoMeta.java
index 3019578ede..3037d457ba 100644
--- a/hugegraph-pd/hg-pd-core/src/main/java/org/apache/hugegraph/pd/meta/StoreInfoMeta.java
+++ b/hugegraph-pd/hg-pd-core/src/main/java/org/apache/hugegraph/pd/meta/StoreInfoMeta.java
@@ -33,11 +33,9 @@
 @Slf4j
 public class StoreInfoMeta extends MetadataRocksDBStore {
 
-    private final PDConfig pdConfig;
 
     public StoreInfoMeta(PDConfig pdConfig) {
         super(pdConfig);
-        this.pdConfig = pdConfig;
         //   this.timeout = pdConfig.getDiscovery().getHeartbeatOutTimes();
     }
 
diff --git a/hugegraph-server/hugegraph-dist/src/assembly/static/conf/rest-server.properties b/hugegraph-server/hugegraph-dist/src/assembly/static/conf/rest-server.properties
index b67905fc19..507867380c 100644
--- a/hugegraph-server/hugegraph-dist/src/assembly/static/conf/rest-server.properties
+++ b/hugegraph-server/hugegraph-dist/src/assembly/static/conf/rest-server.properties
@@ -1,4 +1,5 @@
 # bind url
+# could use '0.0.0.0' or specified (real)IP to expose external network access
 restserver.url=http://127.0.0.1:8080
 # gremlin server url, need to be consistent with host and port in gremlin-server.yaml
 #gremlinserver.url=http://127.0.0.1:8182