1 /**
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package org.apache.hadoop.hbase.master.procedure;
19
20 import org.apache.hadoop.hbase.ServerName;
21 import org.apache.hadoop.hbase.classification.InterfaceAudience;
22 import org.apache.hadoop.hbase.classification.InterfaceStability;
23
24 /**
25 * Procedures that handle servers -- e.g. server crash -- must implement this Interface.
26 * It is used by the procedure runner to figure locking and what queuing.
27 */
28 @InterfaceAudience.Private
29 @InterfaceStability.Evolving
30 public interface ServerProcedureInterface {
31 public enum ServerOperationType {
32 CRASH_HANDLER
33 };
34
35 /**
36 * @return Name of this server instance.
37 */
38 ServerName getServerName();
39
40 /**
41 * @return True if this server has an hbase:meta table region.
42 */
43 boolean hasMetaTableRegion();
44
45 /**
46 * Given an operation type we can take decisions about what to do with pending operations.
47 * e.g. if we get a crash handler and we have some assignment operation pending
48 * we can abort those operations.
49 * @return the operation type that the procedure is executing.
50 */
51 ServerOperationType getServerOperationType();
52 }