| /* |
| * 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.master; |
| |
| import org.apache.hadoop.hbase.HConstants; |
| import org.apache.hadoop.hbase.TableName; |
| import org.apache.hadoop.hbase.ipc.AnnotationReadingPriorityFunction; |
| import org.apache.yetus.audience.InterfaceAudience; |
| |
| import org.apache.hbase.thirdparty.com.google.protobuf.Message; |
| |
| import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil; |
| import org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos; |
| import org.apache.hadoop.hbase.shaded.protobuf.generated.RPCProtos.RequestHeader; |
| import org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos; |
| |
| /** |
| * Priority function specifically for the master. |
| * <p/> |
| * This doesn't make the super users always priority since that would make everything to the master |
| * into high priority. |
| * <p/> |
| * Specifically when reporting that a region is in transition master will try and edit the meta |
| * table. That edit will block the thread until successful. However if at the same time meta is also |
| * moving then we need to ensure that the regular region that's moving isn't blocking processing of |
| * the request to online meta. To accomplish this this priority function makes sure that all |
| * requests to transition meta are handled in different threads from other report region in |
| * transition calls. |
| * <p/> |
| * After HBASE-21754, ReportRegionStateTransitionRequest for meta region will be assigned a META_QOS |
| * , a separate executor called metaTransitionExecutor will execute it. Other transition request |
| * will be executed in priorityExecutor to prevent being mixed with normal requests |
| */ |
| @InterfaceAudience.Private |
| public class MasterAnnotationReadingPriorityFunction |
| extends AnnotationReadingPriorityFunction<MasterRpcServices> { |
| |
| /** |
| * We reference this value in SimpleRpcScheduler so this class have to be public instead of |
| * package private |
| */ |
| public static final int META_TRANSITION_QOS = 300; |
| |
| MasterAnnotationReadingPriorityFunction(MasterRpcServices rpcServices) { |
| super(rpcServices); |
| } |
| |
| @Override |
| protected int normalizePriority(int priority) { |
| // no one can have higher priority than meta transition. |
| if (priority >= META_TRANSITION_QOS) { |
| return META_TRANSITION_QOS - 1; |
| } else { |
| return priority; |
| } |
| } |
| |
| @Override |
| protected int getBasePriority(RequestHeader header, Message param) { |
| // If meta is moving then all the other of reports of state transitions will be |
| // un able to edit meta. Those blocked reports should not keep the report that opens meta from |
| // running. Hence all reports of meta transition should always be in a different thread. |
| // This keeps from deadlocking the cluster. |
| if (param instanceof RegionServerStatusProtos.ReportRegionStateTransitionRequest) { |
| // Regions are moving. Lets see which ones. |
| RegionServerStatusProtos.ReportRegionStateTransitionRequest tRequest = |
| (RegionServerStatusProtos.ReportRegionStateTransitionRequest) param; |
| for (RegionServerStatusProtos.RegionStateTransition rst : tRequest.getTransitionList()) { |
| if (rst.getRegionInfoList() != null) { |
| for (HBaseProtos.RegionInfo info : rst.getRegionInfoList()) { |
| TableName tn = ProtobufUtil.toTableName(info.getTableName()); |
| if (TableName.META_TABLE_NAME.equals(tn)) { |
| return META_TRANSITION_QOS; |
| } |
| } |
| } |
| } |
| return HConstants.HIGH_QOS; |
| } |
| // also use HIGH_QOS for region server report |
| if (param instanceof RegionServerStatusProtos.RegionServerReportRequest) { |
| return HConstants.HIGH_QOS; |
| } |
| // Trust the client-set priorities if set |
| if (header.hasPriority()) { |
| return header.getPriority(); |
| } |
| return HConstants.NORMAL_QOS; |
| } |
| |
| @Override |
| public long getDeadline(RequestHeader header, Message param) { |
| return 0; |
| } |
| } |