| /** |
| * 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.mapred.gridmix; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.conf.Configuration; |
| |
| /** |
| * Given byte and record targets, emit roughly equal-sized records satisfying |
| * the contract. |
| */ |
| class AvgRecordFactory extends RecordFactory { |
| |
| /** |
| * Percentage of record for key data. |
| */ |
| public static final String GRIDMIX_KEY_FRC = "gridmix.key.fraction"; |
| public static final String GRIDMIX_MISSING_REC_SIZE = |
| "gridmix.missing.rec.size"; |
| |
| |
| private final long targetBytes; |
| private final long targetRecords; |
| private final long step; |
| private final int avgrec; |
| private final int keyLen; |
| private long accBytes = 0L; |
| private long accRecords = 0L; |
| private int unspilledBytes = 0; |
| private int minSpilledBytes = 0; |
| |
| /** |
| * @param targetBytes Expected byte count. |
| * @param targetRecords Expected record count. |
| * @param conf Used to resolve edge cases @see #GRIDMIX_KEY_FRC |
| */ |
| public AvgRecordFactory(long targetBytes, long targetRecords, |
| Configuration conf) { |
| this(targetBytes, targetRecords, conf, 0); |
| } |
| |
| /** |
| * @param minSpilledBytes Minimum amount of data expected per record |
| */ |
| public AvgRecordFactory(long targetBytes, long targetRecords, |
| Configuration conf, int minSpilledBytes) { |
| this.targetBytes = targetBytes; |
| this.targetRecords = targetRecords <= 0 && this.targetBytes >= 0 |
| ? Math.max(1, |
| this.targetBytes / conf.getInt(GRIDMIX_MISSING_REC_SIZE, 64 * 1024)) |
| : targetRecords; |
| final long tmp = this.targetBytes / this.targetRecords; |
| step = this.targetBytes - this.targetRecords * tmp; |
| avgrec = (int) Math.min(Integer.MAX_VALUE, tmp + 1); |
| keyLen = Math.max(1, |
| (int)(tmp * Math.min(1.0f, conf.getFloat(GRIDMIX_KEY_FRC, 0.1f)))); |
| this.minSpilledBytes = minSpilledBytes; |
| } |
| |
| @Override |
| public boolean next(GridmixKey key, GridmixRecord val) throws IOException { |
| if (accBytes >= targetBytes) { |
| return false; |
| } |
| final int reclen = accRecords++ >= step ? avgrec - 1 : avgrec; |
| final int len = (int) Math.min(targetBytes - accBytes, reclen); |
| |
| unspilledBytes += len; |
| |
| // len != reclen? |
| if (key != null) { |
| if (unspilledBytes < minSpilledBytes && accRecords < targetRecords) { |
| key.setSize(1); |
| val.setSize(1); |
| accBytes += key.getSize() + val.getSize(); |
| unspilledBytes -= (key.getSize() + val.getSize()); |
| } else { |
| key.setSize(keyLen); |
| val.setSize(unspilledBytes - key.getSize()); |
| accBytes += unspilledBytes; |
| unspilledBytes = 0; |
| } |
| } else { |
| if (unspilledBytes < minSpilledBytes && accRecords < targetRecords) { |
| val.setSize(1); |
| accBytes += val.getSize(); |
| unspilledBytes -= val.getSize(); |
| } else { |
| val.setSize(unspilledBytes); |
| accBytes += unspilledBytes; |
| unspilledBytes = 0; |
| } |
| } |
| return true; |
| } |
| |
| @Override |
| public float getProgress() throws IOException { |
| return Math.min(1.0f, accBytes / ((float)targetBytes)); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| // noop |
| } |
| |
| } |