com.facebook.hiveio.log.HiveLogHelpers.java Source code

Introduction

Here is the source code for com.facebook.hiveio.log.HiveLogHelpers.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 com.facebook.hiveio.log;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.impl.Log4JLogger;
import org.apache.hadoop.hive.metastore.HiveMetaStore;
import org.apache.hadoop.hive.metastore.ObjectStore;
import org.apache.hadoop.hive.ql.Driver;
import org.apache.hadoop.hive.ql.parse.ParseDriver;
import org.apache.log4j.Level;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.collect.Lists;

import java.lang.reflect.Field;
import java.util.List;

/**
 * Helper methods for Hive loggers
 */
public class HiveLogHelpers {
    /** Class logger */
    private static final Logger LOG = LoggerFactory.getLogger(HiveLogHelpers.class);

    /** Do not instantiate */
    private HiveLogHelpers() {
    }

    /**
     * Set the log level for Hive logs
     *
     * @param level Log level to set
     */
    public static void setHiveLogLevel(Level level) {
        List<Log> logs = Lists.newArrayList();
        logs.add(HiveMetaStore.LOG);
        addPrivateStaticLog(logs, Driver.class);
        addPrivateStaticLog(logs, ParseDriver.class);
        addPrivateStaticLog(logs, ObjectStore.class);

        for (Log log : logs) {
            setHiveLoggerLevel(log, level);
        }
    }

    /**
     * Set the log level for Hive logger
     *
     * @param log Hive logger
     * @param level Log level
     */
    public static void setHiveLoggerLevel(Log log, Level level) {
        if (log instanceof Log4JLogger) {
            Log4JLogger log4JLogger = (Log4JLogger) log;
            log4JLogger.getLogger().setLevel(level);
        } else {
            LOG.error("Don't know how to handle logger {} of type {}", log, log.getClass());
        }
    }

    /**
     * Add class logger to the list of logs
     *
     * @param logs List of logs
     * @param klass Class whose logger we want to add
     */
    private static void addPrivateStaticLog(List<Log> logs, Class<?> klass) {
        try {
            Field logField = klass.getDeclaredField("LOG");
            logField.setAccessible(true);
            Log driverLog = (Log) logField.get(null);
            logs.add(driverLog);
        } catch (IllegalAccessException e) {
            LOG.error("Could not get LOG from Hive ql.Driver", e);
        } catch (NoSuchFieldException e) {
            LOG.error("Could not get LOG from Hive ql.Driver", e);
        }
    }
}