diff --git a/hugegraph-cassandra/src/main/java/com/baidu/hugegraph/backend/store/cassandra/CassandraMetrics.java b/hugegraph-cassandra/src/main/java/com/baidu/hugegraph/backend/store/cassandra/CassandraMetrics.java
index b156b7bf51..0443a5f910 100644
--- a/hugegraph-cassandra/src/main/java/com/baidu/hugegraph/backend/store/cassandra/CassandraMetrics.java
+++ b/hugegraph-cassandra/src/main/java/com/baidu/hugegraph/backend/store/cassandra/CassandraMetrics.java
@@ -96,7 +96,7 @@ protected Map<String, Object> getMetricsByHost(String host) {
         try (NodeProbe probe = this.newNodeProbe(host)) {
             MemoryUsage heapUsage = probe.getHeapMemoryUsage();
             metrics.put(MEM_MAX, UnitUtil.bytesToMB(heapUsage.getMax()));
-            metrics.put(MEM_COMMITED,
+            metrics.put(MEM_COMMITTED,
                         UnitUtil.bytesToMB(heapUsage.getCommitted()));
             metrics.put(MEM_USED, UnitUtil.bytesToMB(heapUsage.getUsed()));
             metrics.put(MEM_USED + READABLE,
diff --git a/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/store/BackendMetrics.java b/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/store/BackendMetrics.java
index 1ea473a461..e621c2e440 100644
--- a/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/store/BackendMetrics.java
+++ b/hugegraph-core/src/main/java/com/baidu/hugegraph/backend/store/BackendMetrics.java
@@ -33,7 +33,7 @@ public interface BackendMetrics {
 
     // Memory related metrics
     public String MEM_USED = "mem_used";
-    public String MEM_COMMITED = "mem_commited";
+    public String MEM_COMMITTED = "mem_committed";
     public String MEM_MAX = "mem_max";
     public String MEM_UNIT = "mem_unit";
 
diff --git a/hugegraph-test/src/main/java/com/baidu/hugegraph/api/MetricsApiTest.java b/hugegraph-test/src/main/java/com/baidu/hugegraph/api/MetricsApiTest.java
index c7179fa576..cc5a9d39d8 100644
--- a/hugegraph-test/src/main/java/com/baidu/hugegraph/api/MetricsApiTest.java
+++ b/hugegraph-test/src/main/java/com/baidu/hugegraph/api/MetricsApiTest.java
@@ -109,7 +109,7 @@ public void testMetricsBackend() {
                                       value instanceof Map);
                     host = (Map<?, ?>) value;
                     assertMapContains(host, "mem_max");
-                    assertMapContains(host, "mem_commited");
+                    assertMapContains(host, "mem_committed");
                     assertMapContains(host, "mem_used");
                     assertMapContains(host, "mem_used_readable");
                     assertMapContains(host, "mem_unit");
@@ -171,7 +171,7 @@ public void testMetricsBackend() {
                                       value instanceof Map);
                     host = (Map<?, ?>) value;
                     assertMapContains(host, "mem_max");
-                    assertMapContains(host, "mem_commited");
+                    assertMapContains(host, "mem_committed");
                     assertMapContains(host, "mem_used");
                     assertMapContains(host, "mem_used_readable");
                     assertMapContains(host, "mem_unit");
diff --git a/hugegraph-test/src/main/java/com/baidu/hugegraph/unit/rocksdb/RocksDBSessionTest.java b/hugegraph-test/src/main/java/com/baidu/hugegraph/unit/rocksdb/RocksDBSessionTest.java
index c17af2669e..daa8cf8db5 100644
--- a/hugegraph-test/src/main/java/com/baidu/hugegraph/unit/rocksdb/RocksDBSessionTest.java
+++ b/hugegraph-test/src/main/java/com/baidu/hugegraph/unit/rocksdb/RocksDBSessionTest.java
@@ -23,6 +23,7 @@
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;
+import java.util.Random;
 
 import org.junit.Assume;
 import org.junit.Test;
@@ -40,15 +41,15 @@ public void testPutGet() throws RocksDBException {
         Assert.assertEquals(null, value);
 
         this.rocks.session().put(TABLE, b("person:1gname"), b("James"));
-        this.rocks.session().put(TABLE, b("person:1gage"), b("19"));
+        this.rocks.session().put(TABLE, b("person:1gage"), b(19));
         this.rocks.session().put(TABLE, b("person:1gcity"), b("Beijing"));
         this.commit();
 
         value = s(this.rocks.session().get(TABLE, b("person:1gname")));
         Assert.assertEquals("James", value);
 
-        value = s(this.rocks.session().get(TABLE, b("person:1gage")));
-        Assert.assertEquals("19", value);
+        long age = l(this.rocks.session().get(TABLE, b("person:1gage")));
+        Assert.assertEquals(19, age);
 
         value = s(this.rocks.session().get(TABLE, b("person:1gcity")));
         Assert.assertEquals("Beijing", value);
@@ -491,6 +492,8 @@ public void testDeleteSingle() throws RocksDBException {
 
         // NOTE: maybe return "James" here
         Assert.assertEquals(null, get("person:1gname"));
+        Assert.assertTrue(null == get("person:1gname") ||
+                          "James".equals(get("person:1gname")));
         Assert.assertEquals(null, get("person:1gage"));
     }
 
@@ -520,7 +523,7 @@ public void testCompact() throws RocksDBException {
 
     @Test
     public void testProperty() {
-        int count = 1234;
+        int count = new Random().nextInt(2048);
         for (int i = 0; i < count; i++) {
             put("key-" + i, "value" + i);
         }