| /* |
| * 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.counters; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.mapred.JobConf; |
| |
| import static org.apache.hadoop.mapreduce.MRJobConfig.*; |
| |
| @InterfaceAudience.Private |
| public class Limits { |
| |
| private int totalCounters; |
| private LimitExceededException firstViolation; |
| |
| private static boolean isInited; |
| |
| private static int GROUP_NAME_MAX; |
| private static int COUNTER_NAME_MAX; |
| private static int GROUPS_MAX; |
| private static int COUNTERS_MAX; |
| |
| public synchronized static void init(Configuration conf) { |
| if (!isInited) { |
| if (conf == null) { |
| conf = new JobConf(); |
| } |
| GROUP_NAME_MAX = conf.getInt(COUNTER_GROUP_NAME_MAX_KEY, |
| COUNTER_GROUP_NAME_MAX_DEFAULT); |
| COUNTER_NAME_MAX = conf.getInt(COUNTER_NAME_MAX_KEY, |
| COUNTER_NAME_MAX_DEFAULT); |
| GROUPS_MAX = conf.getInt(COUNTER_GROUPS_MAX_KEY, COUNTER_GROUPS_MAX_DEFAULT); |
| COUNTERS_MAX = conf.getInt(COUNTERS_MAX_KEY, COUNTERS_MAX_DEFAULT); |
| } |
| isInited = true; |
| } |
| |
| public static int getGroupNameMax() { |
| if (!isInited) { |
| init(null); |
| } |
| return GROUP_NAME_MAX; |
| } |
| |
| public static int getCounterNameMax() { |
| if (!isInited) { |
| init(null); |
| } |
| return COUNTER_NAME_MAX; |
| } |
| |
| public static int getGroupsMax() { |
| if (!isInited) { |
| init(null); |
| } |
| return GROUPS_MAX; |
| } |
| |
| public static int getCountersMax() { |
| if (!isInited) { |
| init(null); |
| } |
| return COUNTERS_MAX; |
| } |
| |
| public static String filterName(String name, int maxLen) { |
| return name.length() > maxLen ? name.substring(0, maxLen - 1) : name; |
| } |
| |
| public static String filterCounterName(String name) { |
| return filterName(name, getCounterNameMax()); |
| } |
| |
| public static String filterGroupName(String name) { |
| return filterName(name, getGroupNameMax()); |
| } |
| |
| public synchronized void checkCounters(int size) { |
| if (firstViolation != null) { |
| throw new LimitExceededException(firstViolation); |
| } |
| int countersMax = getCountersMax(); |
| if (size > countersMax) { |
| firstViolation = new LimitExceededException("Too many counters: "+ size + |
| " max="+ countersMax); |
| throw firstViolation; |
| } |
| } |
| |
| public synchronized void incrCounters() { |
| checkCounters(totalCounters + 1); |
| ++totalCounters; |
| } |
| |
| public synchronized void checkGroups(int size) { |
| if (firstViolation != null) { |
| throw new LimitExceededException(firstViolation); |
| } |
| int groupsMax = getGroupsMax(); |
| if (size > groupsMax) { |
| firstViolation = new LimitExceededException("Too many counter groups: "+ |
| size +" max="+ groupsMax); |
| } |
| } |
| |
| public synchronized LimitExceededException violation() { |
| return firstViolation; |
| } |
| } |