| /** |
| * 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.tracing; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.tracing.SpanReceiverInfo.ConfigurationPair; |
| import org.apache.htrace.core.SpanReceiver; |
| import org.apache.htrace.core.TracerPool; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * This class provides functions for managing the tracer configuration at |
| * runtime via an RPC protocol. |
| */ |
| @InterfaceAudience.Private |
| public class TracerConfigurationManager implements TraceAdminProtocol { |
| private static final Logger LOG = |
| LoggerFactory.getLogger(TracerConfigurationManager.class); |
| |
| private final String confPrefix; |
| private final Configuration conf; |
| |
| public TracerConfigurationManager(String confPrefix, Configuration conf) { |
| this.confPrefix = confPrefix; |
| this.conf = conf; |
| } |
| |
| public synchronized SpanReceiverInfo[] listSpanReceivers() |
| throws IOException { |
| TracerPool pool = TracerPool.getGlobalTracerPool(); |
| SpanReceiver[] receivers = pool.getReceivers(); |
| SpanReceiverInfo[] info = new SpanReceiverInfo[receivers.length]; |
| for (int i = 0; i < receivers.length; i++) { |
| SpanReceiver receiver = receivers[i]; |
| info[i] = new SpanReceiverInfo(receiver.getId(), |
| receiver.getClass().getName()); |
| } |
| return info; |
| } |
| |
| public synchronized long addSpanReceiver(SpanReceiverInfo info) |
| throws IOException { |
| StringBuilder configStringBuilder = new StringBuilder(); |
| String prefix = ""; |
| for (ConfigurationPair pair : info.configPairs) { |
| configStringBuilder.append(prefix).append(pair.getKey()). |
| append(" = ").append(pair.getValue()); |
| prefix = ", "; |
| } |
| SpanReceiver rcvr = null; |
| try { |
| rcvr = new SpanReceiver.Builder(TraceUtils.wrapHadoopConf( |
| confPrefix, conf, info.configPairs)). |
| className(info.getClassName().trim()). |
| build(); |
| } catch (RuntimeException e) { |
| LOG.info("Failed to add SpanReceiver " + info.getClassName() + |
| " with configuration " + configStringBuilder.toString(), e); |
| throw e; |
| } |
| TracerPool.getGlobalTracerPool().addReceiver(rcvr); |
| LOG.info("Successfully added SpanReceiver " + info.getClassName() + |
| " with configuration " + configStringBuilder.toString()); |
| return rcvr.getId(); |
| } |
| |
| public synchronized void removeSpanReceiver(long spanReceiverId) |
| throws IOException { |
| SpanReceiver[] receivers = |
| TracerPool.getGlobalTracerPool().getReceivers(); |
| for (SpanReceiver receiver : receivers) { |
| if (receiver.getId() == spanReceiverId) { |
| TracerPool.getGlobalTracerPool().removeAndCloseReceiver(receiver); |
| LOG.info("Successfully removed SpanReceiver " + spanReceiverId + |
| " with class " + receiver.getClass().getName()); |
| return; |
| } |
| } |
| throw new IOException("There is no span receiver with id " + spanReceiverId); |
| } |
| } |