| /** |
| * 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.mapreduce.jobhistory; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| |
| import org.apache.avro.Schema; |
| import org.apache.avro.io.DatumWriter; |
| import org.apache.avro.io.Encoder; |
| import org.apache.avro.io.EncoderFactory; |
| import org.apache.avro.specific.SpecificDatumWriter; |
| import org.apache.avro.util.Utf8; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.fs.FSDataOutputStream; |
| import org.apache.hadoop.io.IOUtils; |
| import org.apache.hadoop.mapreduce.Counter; |
| import org.apache.hadoop.mapreduce.CounterGroup; |
| import org.apache.hadoop.mapreduce.Counters; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| |
| /** |
| * Event Writer is an utility class used to write events to the underlying |
| * stream. Typically, one event writer (which translates to one stream) |
| * is created per job |
| * |
| */ |
| @InterfaceAudience.Private |
| @InterfaceStability.Unstable |
| public class EventWriter { |
| static final String VERSION = "Avro-Json"; |
| static final String VERSION_BINARY = "Avro-Binary"; |
| |
| private FSDataOutputStream out; |
| private DatumWriter<Event> writer = |
| new SpecificDatumWriter<Event>(Event.class); |
| private Encoder encoder; |
| private static final Log LOG = LogFactory.getLog(EventWriter.class); |
| |
| /** |
| * avro encoding format supported by EventWriter. |
| */ |
| public enum WriteMode { JSON, BINARY } |
| private final WriteMode writeMode; |
| private final boolean jsonOutput; // Cache value while we have 2 modes |
| |
| @VisibleForTesting |
| public EventWriter(FSDataOutputStream out, WriteMode mode) |
| throws IOException { |
| this.out = out; |
| this.writeMode = mode; |
| if (this.writeMode==WriteMode.JSON) { |
| this.jsonOutput = true; |
| out.writeBytes(VERSION); |
| } else if (this.writeMode==WriteMode.BINARY) { |
| this.jsonOutput = false; |
| out.writeBytes(VERSION_BINARY); |
| } else { |
| throw new IOException("Unknown mode: " + mode); |
| } |
| out.writeBytes("\n"); |
| out.writeBytes(Event.SCHEMA$.toString()); |
| out.writeBytes("\n"); |
| if (!this.jsonOutput) { |
| this.encoder = EncoderFactory.get().binaryEncoder(out, null); |
| } else { |
| this.encoder = EncoderFactory.get().jsonEncoder(Event.SCHEMA$, out); |
| } |
| } |
| |
| synchronized void write(HistoryEvent event) throws IOException { |
| Event wrapper = new Event(); |
| wrapper.setType(event.getEventType()); |
| wrapper.setEvent(event.getDatum()); |
| writer.write(wrapper, encoder); |
| encoder.flush(); |
| if (this.jsonOutput) { |
| out.writeBytes("\n"); |
| } |
| } |
| |
| void flush() throws IOException { |
| encoder.flush(); |
| out.flush(); |
| out.hflush(); |
| } |
| |
| @VisibleForTesting |
| public void close() throws IOException { |
| try { |
| encoder.flush(); |
| out.close(); |
| out = null; |
| } finally { |
| IOUtils.cleanup(LOG, out); |
| } |
| } |
| |
| private static final Schema GROUPS = |
| Schema.createArray(JhCounterGroup.SCHEMA$); |
| |
| private static final Schema COUNTERS = |
| Schema.createArray(JhCounter.SCHEMA$); |
| |
| static JhCounters toAvro(Counters counters) { |
| return toAvro(counters, "COUNTERS"); |
| } |
| static JhCounters toAvro(Counters counters, String name) { |
| JhCounters result = new JhCounters(); |
| result.setName(new Utf8(name)); |
| result.setGroups(new ArrayList<JhCounterGroup>(0)); |
| if (counters == null) return result; |
| for (CounterGroup group : counters) { |
| JhCounterGroup g = new JhCounterGroup(); |
| g.setName(new Utf8(group.getName())); |
| g.setDisplayName(new Utf8(group.getDisplayName())); |
| g.setCounts(new ArrayList<JhCounter>(group.size())); |
| for (Counter counter : group) { |
| JhCounter c = new JhCounter(); |
| c.setName(new Utf8(counter.getName())); |
| c.setDisplayName(new Utf8(counter.getDisplayName())); |
| c.setValue(counter.getValue()); |
| g.getCounts().add(c); |
| } |
| result.getGroups().add(g); |
| } |
| return result; |
| } |
| |
| } |