| /* |
| * 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.hadoop.hbase.client; |
| |
| import org.apache.hadoop.hbase.HRegionLocation; |
| import org.apache.hadoop.hbase.TableName; |
| import org.apache.yetus.audience.InterfaceAudience; |
| |
| /** |
| * A Catalog replica selector decides which catalog replica to go for read requests when it is |
| * configured as CatalogReplicaMode.LoadBalance. |
| */ |
| @InterfaceAudience.Private |
| interface CatalogReplicaLoadBalanceSelector { |
| |
| /** |
| * This method is called when input location is stale, i.e, when clients run into |
| * org.apache.hadoop.hbase.NotServingRegionException. |
| * @param loc stale location |
| */ |
| void onError(HRegionLocation loc); |
| |
| /** |
| * Select a catalog replica region where client go to loop up the input row key. |
| * |
| * @param tablename table name |
| * @param row key to look up |
| * @param locateType locate type |
| * @return replica id |
| */ |
| int select(TableName tablename, byte[] row, RegionLocateType locateType); |
| } |