org.apache.hadoop.mapreduce.counters.Limits.java Source code

Introduction

Here is the source code for org.apache.hadoop.mapreduce.counters.Limits.java

Source

/*
 * 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;
    }
}