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.hadoop.hbase.quotas.QuotaCache; 022import org.apache.yetus.audience.InterfaceAudience; 023 024/** 025 * Procedures that handle servers -- e.g. server crash -- must implement this Interface. It is used 026 * by the procedure runner to figure locking and what queuing. 027 */ 028@InterfaceAudience.Private 029public interface ServerProcedureInterface { 030 public enum ServerOperationType { 031 CRASH_HANDLER, 032 SWITCH_RPC_THROTTLE, 033 034 /** 035 * help find a available region server as worker and release worker after task done invoke 036 * SPLIT_WAL_REMOTE operation to send real WAL splitting request to worker manage the split wal 037 * task flow, will retry if SPLIT_WAL_REMOTE failed 038 */ 039 SPLIT_WAL, 040 041 /** 042 * send the split WAL request to region server and handle the response 043 */ 044 SPLIT_WAL_REMOTE, 045 046 /** 047 * Get all the replication queues of a crash server and assign them to other region servers 048 */ 049 CLAIM_REPLICATION_QUEUES, 050 051 /** 052 * send the claim replication queue request to region server to actually assign it 053 */ 054 CLAIM_REPLICATION_QUEUE_REMOTE, 055 056 /** 057 * send verify snapshot request to region server and handle the response 058 */ 059 VERIFY_SNAPSHOT, 060 061 /** 062 * Re-read the hbase:quotas table and update {@link QuotaCache}. 063 */ 064 RELOAD_QUOTAS, 065 } 066 067 /** Returns Name of this server instance. */ 068 ServerName getServerName(); 069 070 /** Returns True if this server has an hbase:meta table region. */ 071 boolean hasMetaTableRegion(); 072 073 /** 074 * Given an operation type we can take decisions about what to do with pending operations. e.g. if 075 * we get a crash handler and we have some assignment operation pending we can abort those 076 * operations. 077 * @return the operation type that the procedure is executing. 078 */ 079 ServerOperationType getServerOperationType(); 080}