001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.master.procedure;
019
020import org.apache.hadoop.hbase.ServerName;
021import org.apache.yetus.audience.InterfaceAudience;
022
023/**
024 * Procedures that handle servers -- e.g. server crash -- must implement this Interface.
025 * It is used by the procedure runner to figure locking and what queuing.
026 */
027@InterfaceAudience.Private
028public interface ServerProcedureInterface {
029  public enum ServerOperationType {
030    CRASH_HANDLER, SWITCH_RPC_THROTTLE,
031    /**
032     * help find a available region server as worker and release worker after task done
033     * invoke SPLIT_WAL_REMOTE operation to send real WAL splitting request to worker
034     * manage the split wal task flow, will retry if SPLIT_WAL_REMOTE failed
035     */
036    SPLIT_WAL,
037
038    /**
039     * send the split WAL request to region server and handle the response
040     */
041    SPLIT_WAL_REMOTE
042  }
043
044  /**
045   * @return Name of this server instance.
046   */
047  ServerName getServerName();
048
049  /**
050   * @return True if this server has an hbase:meta table region.
051   */
052  boolean hasMetaTableRegion();
053
054  /**
055   * Given an operation type we can take decisions about what to do with pending operations.
056   * e.g. if we get a crash handler and we have some assignment operation pending
057   * we can abort those operations.
058   * @return the operation type that the procedure is executing.
059   */
060  ServerOperationType getServerOperationType();
061}