diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/store/BackendTable.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/store/BackendTable.java
index f8ec5fe238..6fb564df04 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/store/BackendTable.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/store/BackendTable.java
@@ -193,13 +193,13 @@ public List<Shard> getSplits(Session session, long splitSize) {
                 count = 1;
             }
             long maxKey = this.maxKey();
-            double each = maxKey / count;
+            Double each = maxKey / count;
 
             List<Shard> splits = new ArrayList<>((int) count);
             String last = START;
             long offset = 0L;
             while (offset < maxKey) {
-                offset += each;
+                offset += each.longValue();
                 if (offset > maxKey) {
                     splits.add(new Shard(last, END, 0L));
                     break;
diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/util/ConfigUtil.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/util/ConfigUtil.java
index 5dea629106..57462e7b99 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/util/ConfigUtil.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/util/ConfigUtil.java
@@ -23,7 +23,6 @@
 import java.io.IOException;
 import java.io.Reader;
 import java.io.StringReader;
-import java.nio.file.Paths;
 import java.util.List;
 import java.util.Map;
 
@@ -110,11 +109,13 @@ public static Map<String, String> scanGraphsDir(String graphsDirPath) {
 
     public static String writeToFile(String dir, String graphName,
                                      HugeConfig config) {
-        E.checkArgument(FileUtils.getFile(dir).exists(),
-                        "The directory '%s' must exist", dir);
-        String fileName = Paths.get(dir, graphName + CONF_SUFFIX).toString();
+        File path = FileUtils.getFile(dir);
+        E.checkArgument(path.exists(),
+                "The directory '%s' must exist", dir);
+        String fileName = path.getPath() + File.separator + graphName + CONF_SUFFIX;
         try {
-            config.save(new File(fileName));
+            File newFile = FileUtils.getFile(fileName);
+            config.save(newFile);
             LOG.info("Write HugeConfig to file: '{}'", fileName);
         } catch (ConfigurationException e) {
             throw new HugeException("Failed to write HugeConfig to file '%s'",
diff --git a/hugegraph-hbase/src/main/java/com/baidu/hugegraph/backend/store/hbase/HbaseMetrics.java b/hugegraph-hbase/src/main/java/com/baidu/hugegraph/backend/store/hbase/HbaseMetrics.java
index ed17ff0be3..beeca6fc4c 100644
--- a/hugegraph-hbase/src/main/java/com/baidu/hugegraph/backend/store/hbase/HbaseMetrics.java
+++ b/hugegraph-hbase/src/main/java/com/baidu/hugegraph/backend/store/hbase/HbaseMetrics.java
@@ -127,7 +127,8 @@ private static Map<String, Object> formatMetrics(
                                                          .values();
         long fileSizeBytes = 0L;
         for (RegionMetrics region : regions) {
-            fileSizeBytes += region.getStoreFileSize().get(Size.Unit.BYTE);
+            Double tempValue = region.getStoreFileSize().get(Size.Unit.BYTE);
+            fileSizeBytes += tempValue.longValue();
         }
         metrics.put(DISK_USAGE, UnitUtil.bytesToGB(fileSizeBytes));
         metrics.put(DISK_USAGE + READABLE,
diff --git a/hugegraph-hbase/src/main/java/com/baidu/hugegraph/backend/store/hbase/HbaseSessions.java b/hugegraph-hbase/src/main/java/com/baidu/hugegraph/backend/store/hbase/HbaseSessions.java
index 89f82d63c5..12631a85c8 100644
--- a/hugegraph-hbase/src/main/java/com/baidu/hugegraph/backend/store/hbase/HbaseSessions.java
+++ b/hugegraph-hbase/src/main/java/com/baidu/hugegraph/backend/store/hbase/HbaseSessions.java
@@ -315,8 +315,11 @@ public long storeSize(String table) throws IOException {
                 //total += load.getMemStoreSizeMB() * Bytes.MB;
                 TableName tableName = TableName.valueOf(this.namespace, table);
                 for (RegionMetrics m : admin.getRegionMetrics(rs, tableName)) {
-                    total += m.getStoreFileSize().get(Size.Unit.BYTE);
-                    total += m.getMemStoreSize().get(Size.Unit.BYTE);
+                    Double storeFileSize = m.getStoreFileSize().get(Size.Unit.BYTE);
+                    total += storeFileSize.longValue();
+
+                    Double memStoreFileSize = m.getMemStoreSize().get(Size.Unit.BYTE);
+                    total += memStoreFileSize.longValue();
                 }
             }
         }
diff --git a/hugegraph-test/src/main/java/com/baidu/hugegraph/core/EdgeCoreTest.java b/hugegraph-test/src/main/java/com/baidu/hugegraph/core/EdgeCoreTest.java
index 5bfed17e4c..701fa31286 100644
--- a/hugegraph-test/src/main/java/com/baidu/hugegraph/core/EdgeCoreTest.java
+++ b/hugegraph-test/src/main/java/com/baidu/hugegraph/core/EdgeCoreTest.java
@@ -5218,15 +5218,15 @@ public void testQueryBothEdgesOfVertexInPaging() {
         while (page != null) {
             GraphTraversal<?, ?> iterator = graph.traversal().V(james).bothE()
                                                  .has("~page", page).limit(1);
-            long size = IteratorUtils.count(iterator);
+            Long size = IteratorUtils.count(iterator);
             if (size == 0L) {
                 // The last page is empty
                 Assert.assertEquals(6, count);
             } else {
-                Assert.assertEquals(1, size);
+                Assert.assertEquals(1, size.intValue());
             }
             page = TraversalUtil.page(iterator);
-            count += size;
+            count += size.intValue();
         }
         Assert.assertEquals(6, count);
     }
@@ -5244,15 +5244,15 @@ public void testQueryOutEdgesOfVertexInPaging() {
         while (page != null) {
             GraphTraversal<?, ?> iterator = graph.traversal().V(james).outE()
                                                  .has("~page", page).limit(1);
-            long size = IteratorUtils.count(iterator);
+            Long size = IteratorUtils.count(iterator);
             if (size == 0L) {
                 // The last page is empty
                 Assert.assertEquals(4, count);
             } else {
-                Assert.assertEquals(1, size);
+                Assert.assertEquals(1, size.intValue());
             }
             page = TraversalUtil.page(iterator);
-            count += size;
+            count += size.intValue();
         }
         Assert.assertEquals(4, count);
     }
@@ -5270,15 +5270,15 @@ public void testQueryInEdgesOfVertexInPaging() {
         while (page != null) {
             GraphTraversal<?, ?> iterator = graph.traversal().V(james).inE()
                                                  .has("~page", page).limit(1);
-            long size = IteratorUtils.count(iterator);
+            Long size = IteratorUtils.count(iterator);
             if (size == 0L) {
                 // The last page is empty
                 Assert.assertEquals(2, count);
             } else {
-                Assert.assertEquals(1, size);
+                Assert.assertEquals(1, size.intValue());
             }
             page = TraversalUtil.page(iterator);
-            count += size;
+            count += size.intValue();
         }
         Assert.assertEquals(2, count);
     }
@@ -7516,10 +7516,10 @@ private int traverseInPage(Function<String, GraphTraversal<?, ?>> fetcher) {
         int count = 0;
         while (page != null) {
             GraphTraversal<?, ?> iterator = fetcher.apply(page);
-            long size = IteratorUtils.count(iterator);
+            Long size = IteratorUtils.count(iterator);
             Assert.assertLte(1L, size);
             page = TraversalUtil.page(iterator);
-            count += size;
+            count += size.intValue();
         }
         return count;
     }