[Subtask]: Modify DefaultTableService to be compatible with master-slave mode.

amoro-ams/src/main/java/org/apache/amoro/server/AmoroManagementConf.java

@@ -307,6 +307,13 @@ public class AmoroManagementConf {
           .withDescription(
               "Interval for bucket assignment service to detect node changes and redistribute bucket IDs.");
 
+  public static final ConfigOption<Duration> HA_BUCKET_TABLE_SYNC_INTERVAL =
+      ConfigOptions.key("ha.bucket-table-sync.interval")
+          .durationType()
+          .defaultValue(Duration.ofSeconds(60))
+          .withDescription(
+              "Interval for syncing tables assigned to bucket IDs in master-slave mode. Each node periodically loads tables from database based on its assigned bucket IDs.");
+
   public static final ConfigOption<Integer> TABLE_SERVICE_THRIFT_BIND_PORT =
       ConfigOptions.key("thrift-server.table-service.bind-port")
           .intType()

amoro-ams/src/main/java/org/apache/amoro/server/AmoroServiceContainer.java

@@ -250,12 +250,17 @@ public void startOptimizingService() throws Exception {
 
     DefaultTableRuntimeFactory defaultRuntimeFactory = new DefaultTableRuntimeFactory();
     defaultRuntimeFactory.initialize(processFactories);
-    // In master-slave mode, create AmsAssignService for bucket assignment
+
+    BucketAssignStore bucketAssignStore = null;
     if (IS_MASTER_SLAVE_MODE && haContainer != null) {
+      bucketAssignStore = BucketAssignStoreFactory.create(haContainer, serviceConfig);
+    }
+
+    // In master-slave mode, create AmsAssignService for bucket assignment (shares BucketAssignStore
+    // with DefaultTableService).
+    if (IS_MASTER_SLAVE_MODE && haContainer != null && bucketAssignStore != null) {
       try {
-        // Create and start AmsAssignService for bucket assignment
-        // The factory will handle different HA types (ZK, database, etc.)
-        amsAssignService = new AmsAssignService(haContainer, serviceConfig);
+        amsAssignService = new AmsAssignService(haContainer, serviceConfig, bucketAssignStore);
         amsAssignService.start();
         LOG.info("AmsAssignService started for master-slave mode");
       } catch (UnsupportedOperationException e) {
@@ -267,7 +272,9 @@ public void startOptimizingService() throws Exception {
 
     List<ActionCoordinator> actionCoordinators = defaultRuntimeFactory.supportedCoordinators();
 
-    tableService = new DefaultTableService(serviceConfig, catalogManager, defaultRuntimeFactory);
+    tableService =
+        new DefaultTableService(
+            serviceConfig, catalogManager, defaultRuntimeFactory, haContainer, bucketAssignStore);
     processService = new ProcessService(tableService, actionCoordinators, executeEngineManager);
     optimizingService =
         new DefaultOptimizingService(serviceConfig, catalogManager, optimizerManager, tableService);

amoro-ams/src/main/java/org/apache/amoro/server/AmsAssignService.java

@@ -67,6 +67,18 @@ boolean isRunning() {
   }
 
   public AmsAssignService(HighAvailabilityContainer haContainer, Configurations serviceConfig) {
+    this(haContainer, serviceConfig, null);
+  }
+
+  /**
+   * @param assignStore if non-null, used as the bucket assignment store; otherwise one is created
+   *     via {@link BucketAssignStoreFactory} (same instance can be shared with {@code
+   *     DefaultTableService}).
+   */
+  public AmsAssignService(
+      HighAvailabilityContainer haContainer,
+      Configurations serviceConfig,
+      BucketAssignStore assignStore) {
     this.haContainer = haContainer;
     this.serviceConfig = serviceConfig;
     this.bucketIdTotalCount =
@@ -75,7 +87,10 @@ public AmsAssignService(HighAvailabilityContainer haContainer, Configurations se
         serviceConfig.get(AmoroManagementConf.HA_NODE_OFFLINE_TIMEOUT).toMillis();
     this.assignIntervalSeconds =
         serviceConfig.get(AmoroManagementConf.HA_ASSIGN_INTERVAL).getSeconds();
-    this.assignStore = BucketAssignStoreFactory.create(haContainer, serviceConfig);
+    this.assignStore =
+        assignStore != null
+            ? assignStore
+            : BucketAssignStoreFactory.create(haContainer, serviceConfig);
   }
 
   /**

amoro-ams/src/main/java/org/apache/amoro/server/ha/DataBaseHighAvailabilityContainer.java

@@ -175,6 +175,11 @@ public boolean hasLeadership() {
     return isLeader.get();
   }
 
+  @Override
+  public AmsServerInfo getTableServiceServerInfo() {
+    return tableServiceServerInfo;
+  }
+
   /** Closes the heartbeat executor safely. */
   @Override
   public void close() {

amoro-ams/src/main/java/org/apache/amoro/server/ha/HighAvailabilityContainer.java

@@ -68,4 +68,11 @@ public interface HighAvailabilityContainer {
    * @return true if the current AMS node is the primary node, false otherwise
    */
   boolean hasLeadership();
+
+  /**
+   * Get current AMS node information.
+   *
+   * @return {@link AmsServerInfo}
+   */
+  AmsServerInfo getTableServiceServerInfo();
 }

amoro-ams/src/main/java/org/apache/amoro/server/ha/NoopHighAvailabilityContainer.java

@@ -61,4 +61,9 @@ public List<AmsServerInfo> getAliveNodes() {
   public boolean hasLeadership() {
     return false;
   }
+
+  @Override
+  public AmsServerInfo getTableServiceServerInfo() {
+    return null;
+  }
 }

amoro-ams/src/main/java/org/apache/amoro/server/persistence/BucketIdCount.java

@@ -0,0 +1,41 @@
+/*
+ * 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.amoro.server.persistence;
+
+/** Simple class to hold bucketId and its table count. */
+public class BucketIdCount {
+  private String bucketId;
+  private Integer count;
+
+  public String getBucketId() {
+    return bucketId;
+  }
+
+  public void setBucketId(String bucketId) {
+    this.bucketId = bucketId;
+  }
+
+  public Integer getCount() {
+    return count;
+  }
+
+  public void setCount(Integer count) {
+    this.count = count;
+  }
+}

amoro-ams/src/main/java/org/apache/amoro/server/persistence/mapper/TableRuntimeMapper.java

@@ -18,6 +18,7 @@
 
 package org.apache.amoro.server.persistence.mapper;
 
+import org.apache.amoro.server.persistence.BucketIdCount;
 import org.apache.amoro.server.persistence.TableRuntimeMeta;
 import org.apache.amoro.server.persistence.TableRuntimeState;
 import org.apache.ibatis.annotations.Delete;
@@ -59,6 +60,17 @@ public interface TableRuntimeMapper {
           + " WHERE table_id = #{tableId}")
   int updateRuntime(TableRuntimeMeta meta);
 
+  /**
+   * Sets bucket_id only when it is still null. Avoids overwriting status/config/summary with stale
+   * snapshots from a prior read.
+   */
+  @Update(
+      "UPDATE "
+          + TABLE_NAME
+          + " SET bucket_id = #{bucketId, jdbcType=VARCHAR} "
+          + "WHERE table_id = #{tableId} AND bucket_id IS NULL")
+  int updateBucketIdIfNull(@Param("tableId") Long tableId, @Param("bucketId") String bucketId);
+
   /* ---------- delete ---------- */
   @Delete("DELETE FROM " + TABLE_NAME + " WHERE table_id = #{tableId}")
   int deleteRuntime(@Param("tableId") Long tableId);
@@ -102,6 +114,29 @@ public interface TableRuntimeMapper {
   @ResultMap("tableRuntimeMeta")
   List<TableRuntimeMeta> selectAllRuntimes();
 
+  @Select(
+      "<script>"
+          + "SELECT "
+          + SELECT_COLS
+          + "FROM "
+          + TABLE_NAME
+          + " WHERE bucket_id IN "
+          + "<foreach item='item' collection='bucketIds' open='(' separator=',' close=')'>"
+          + "#{item}"
+          + "</foreach>"
+          + "<if test='includeNullBucketId'> OR bucket_id IS NULL </if>"
+          + "</script>")
+  /**
+   * Select runtimes by bucket ids.
+   *
+   * @param includeNullBucketId false = only rows with bucket_id in list (master-slave); true = also
+   *     include bucket_id IS NULL (e.g. for non-master-slave compatibility)
+   */
+  @ResultMap("tableRuntimeMeta")
+  List<TableRuntimeMeta> selectRuntimesByBucketIds(
+      @Param("bucketIds") List<String> bucketIds,
+      @Param("includeNullBucketId") boolean includeNullBucketId);
+
   @Select(
       "<script>"
           + "<bind name=\"isMySQL\" value=\"_databaseId == 'mysql'\" />"
@@ -180,4 +215,19 @@ void saveState(
 
   @Delete("DELETE FROM " + STATE_TABLE_NAME + " WHERE table_id = #{tableId}")
   void removeAllTableStates(@Param("tableId") long tableId);
+
+  /**
+   * Count tables per bucketId. Returns a map where key is bucketId and value is the count of tables
+   * for that bucketId. Only counts non-null and non-empty bucketIds.
+   */
+  @Select(
+      "SELECT bucket_id, COUNT(*) as table_count FROM "
+          + TABLE_NAME
+          + " WHERE bucket_id IS NOT NULL AND bucket_id != '' "
+          + "GROUP BY bucket_id")
+  @Results({
+    @Result(column = "bucket_id", property = "bucketId"),
+    @Result(column = "table_count", property = "count")
+  })
+  List<BucketIdCount> countTablesByBucketId();
 }