fix(server): ensure graph clear API does not clear meta table for hbase

hugegraph-server/hugegraph-hbase/src/main/java/org/apache/hugegraph/backend/store/hbase/HbaseStore.java

@@ -114,6 +114,13 @@ protected List<String> tableNames() {
                           .collect(Collectors.toList());
     }
 
+    protected List<String> truncatedTableNames() {
+        return this.tables.entrySet().stream()
+                          .filter(e -> !(HugeType.META == e.getKey()))
+                          .map(e -> e.getValue().table())
+                          .collect(Collectors.toList());
+    }
+
     public String namespace() {
         return this.namespace;
     }
@@ -371,7 +378,7 @@ public void truncate() {
         };
 
         // Truncate tables
-        List<String> tables = this.tableNames();
+        List<String> tables = this.truncatedTableNames();
         Map<String, Future<Void>> futures = new HashMap<>(tables.size());
 
         try {

hugegraph-server/hugegraph-test/src/main/java/org/apache/hugegraph/unit/hbase/BaseHbaseUnitTest.java

@@ -0,0 +1,63 @@
+/*
+ *
+ *  * Licensed to the Apache Software Foundation (ASF) under one or more
+ *  * contributor license agreements.  See the NOTICE file distributed with
+ *  * this work for additional information regarding copyright ownership.
+ *  * The ASF licenses this file to You under the Apache License, Version 2.0
+ *  * (the "License"); you may not use this file except in compliance with
+ *  * the License.  You may obtain a copy of the License at
+ *  *
+ *  *     http://www.apache.org/licenses/LICENSE-2.0
+ *  *
+ *  * Unless required by applicable law or agreed to in writing, software
+ *  * distributed under the License is distributed on an "AS IS" BASIS,
+ *  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  * See the License for the specific language governing permissions and
+ *  * limitations under the License.
+ *
+ */
+
+package org.apache.hugegraph.unit.hbase;
+
+import org.apache.commons.configuration2.Configuration;
+import org.apache.hugegraph.backend.store.hbase.HbaseSessions;
+import org.apache.hugegraph.backend.store.hbase.HbaseStoreProvider;
+import org.apache.hugegraph.config.HugeConfig;
+import org.apache.hugegraph.testutil.Utils;
+import org.apache.hugegraph.unit.BaseUnitTest;
+import org.junit.After;
+
+import java.io.IOException;
+
+public class BaseHbaseUnitTest extends BaseUnitTest{
+
+    private static final String GRAPH_NAME = "test_graph";
+
+    protected HugeConfig config;
+    protected HbaseStoreProvider provider;
+    protected HbaseSessions sessions;
+
+    public void setup() throws IOException {
+        Configuration conf = Utils.getConf();
+        this.config = new HugeConfig(conf);
+        this.provider = new HbaseStoreProvider();
+        this.provider.open(GRAPH_NAME);
+        this.provider.loadSystemStore(config).open(config);
+        this.provider.loadGraphStore(config).open(config);
+        this.provider.loadSchemaStore(config).open(config);
+        this.provider.init();
+        this.sessions = new HbaseSessions(config,GRAPH_NAME, this.provider.loadGraphStore(config).store());
+        this.sessions.open();
+    }
+
+    @After
+    public void down(){
+        if (this.provider != null) {
+            try {
+                this.provider.close();
+            } catch (Exception e) {
+                LOG.warn("Failed to close provider",e);
+            }
+        }
+    }
+}

hugegraph-server/hugegraph-test/src/main/java/org/apache/hugegraph/unit/hbase/HbaseUnitTest.java

@@ -0,0 +1,89 @@
+/*
+ *
+ *  * Licensed to the Apache Software Foundation (ASF) under one or more
+ *  * contributor license agreements.  See the NOTICE file distributed with
+ *  * this work for additional information regarding copyright ownership.
+ *  * The ASF licenses this file to You under the Apache License, Version 2.0
+ *  * (the "License"); you may not use this file except in compliance with
+ *  * the License.  You may obtain a copy of the License at
+ *  *
+ *  *     http://www.apache.org/licenses/LICENSE-2.0
+ *  *
+ *  * Unless required by applicable law or agreed to in writing, software
+ *  * distributed under the License is distributed on an "AS IS" BASIS,
+ *  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  * See the License for the specific language governing permissions and
+ *  * limitations under the License.
+ *
+ */
+
+package org.apache.hugegraph.unit.hbase;
+
+import org.apache.hadoop.hbase.client.Result;
+import org.apache.hugegraph.backend.store.BackendEntry.BackendIterator;
+import org.apache.hugegraph.backend.store.BackendStore;
+import org.apache.hugegraph.testutil.Assert;
+import org.apache.hugegraph.backend.store.hbase.HbaseSessions;
+import org.apache.hugegraph.util.StringEncoding;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.io.IOException;
+
+public class HbaseUnitTest extends BaseHbaseUnitTest {
+
+    @Before
+    public void setUp() throws IOException {
+        super.setup();
+    }
+
+    @Test
+    public void testHbaseMetaVersionAfterTruncate() {
+        BackendStore systemStore = this.provider.loadSystemStore(config);
+
+        // Record system version before truncation
+        String beforeVersion = systemStore.storedVersion();
+
+        HbaseSessions.Session testsession = this.sessions.session();
+
+        // Insert test data
+        testsession.put("g_v", "f".getBytes(), "row_trunc_v".getBytes(), StringEncoding.encode("q"), StringEncoding.encode("v"));
+        testsession.put("g_oe", "f".getBytes(), "row_trunc_oe".getBytes(), StringEncoding.encode("q"), StringEncoding.encode("v"));
+        testsession.put("g_ie", "f".getBytes(), "row_trunc_ie".getBytes(), StringEncoding.encode("q"), StringEncoding.encode("v"));
+        testsession.commit();
+
+        // Verify data insertion success
+        BackendIterator<Result> vIterator = testsession.get("g_v", "f".getBytes(), "row_trunc_v".getBytes());
+        BackendIterator<Result> oeIterator = testsession.get("g_oe", "f".getBytes(), "row_trunc_oe".getBytes());
+        BackendIterator<Result> ieIterator = testsession.get("g_ie", "f".getBytes(), "row_trunc_ie".getBytes());
+
+        Assert.assertTrue("data should exist", vIterator.hasNext());
+        Assert.assertTrue("data should exist", oeIterator.hasNext());
+        Assert.assertTrue("data should exist", ieIterator.hasNext());
+
+        vIterator.close();
+        oeIterator.close();
+        ieIterator.close();
+
+        // Execute truncate operation, clears all graph data but preserves system tables
+        this.provider.truncate();
+
+        // Verify system version remains unchanged after truncation
+        String afterVersion = systemStore.storedVersion();
+        Assert.assertNotNull("System metadata version should exist",afterVersion);
+        Assert.assertEquals("System metadata version should remain unchanged after truncation", beforeVersion, afterVersion);
+
+        // Verify data has been cleared
+        vIterator = testsession.get("g_v", "f".getBytes(), "row_trunc_v".getBytes());
+        oeIterator = testsession.get("g_oe", "f".getBytes(), "row_trunc_oe".getBytes());
+        ieIterator = testsession.get("g_ie", "f".getBytes(), "row_trunc_ie".getBytes());
+
+        Assert.assertFalse("data should not exist", vIterator.hasNext());
+        Assert.assertFalse("data should not exist", oeIterator.hasNext());
+        Assert.assertFalse("data should not exist", ieIterator.hasNext());
+
+        vIterator.close();
+        oeIterator.close();
+        ieIterator.close();
+    }
+}