我们有hadoop集群版本2.6.5（hortonworks）和基于ambari的平台gui，
我们将log4j配置为使用rollingfileappender和maxbackupindex进行10次备份
重新启动配置单元服务后，我们看到了以下奇怪的事情
在/var/log/hive下，我可以看到以下日志（示例）

-rw-r--r-- 1 hive hadoop       0 Aug  6 03:40 hiveserver2.log.23-20180804
-rw-r--r-- 1 hive hadoop       0 Aug  6 03:40 hiveserver2.log.23-20180804-20180805
-rw-r--r-- 1 hive hadoop       0 Aug  6 03:40 hiveserver2.log.23-20180805
-rw-r--r-- 1 hive hadoop       0 Aug  6 03:40 hiveserver2.log.24
-rw-r--r-- 1 hive hadoop       0 Aug  6 03:40 hiveserver2.log.24-20180804
-rw-r--r-- 1 hive hadoop       0 Aug  6 03:40 hiveserver2.log.24-20180804-20180805
-rw-r--r-- 1 hive hadoop       0 Aug  6 03:40 hiveserver2.log.24-20180805

我不明白为什么日志会变成“-20180803”，
因为这不是我们在hive-log4j中定义的
ambari的hive-log4j配置示例

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# 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.

# Define some default values that can be overridden by system properties

hive.log.threshold=ALL
hive.root.logger=INFO,DRFA
hive.log.dir=${java.io.tmpdir}/${user.name}
hive.log.file=hive.log

# Define the root logger to the system property "hadoop.root.logger".

log4j.rootLogger=${hive.root.logger}, EventCounter

# Logging Threshold

log4j.threshold=${hive.log.threshold}

# 

# Daily Rolling File Appender

# 

# Use the PidDailyerRollingFileAppend class instead if you want to use separate log files

# for different CLI session.

# 

# log4j.appender.DRFA=org.apache.hadoop.hive.ql.log.PidDailyRollingFileAppender

# log4j.appender.DRFA=org.apache.log4j.DailyRollingFileAppender

log4j.appender.DRFA.File=${hive.log.dir}/${hive.log.file}

# Rollver at midnight

log4j.appender.DRFA=org.apache.log4j.RollingFileAppender
log4j.appender.DRFA.MaxBackupIndex=10
log4j.appender.DRFA.MaxFileSize=100MB

# log4j.appender.DRFA.DatePattern=.yyyy-MM-dd

# 30-day backup

# log4j.appender.DRFA.MaxBackupIndex=30

log4j.appender.DRFA.layout=org.apache.log4j.PatternLayout

# Pattern format: Date LogLevel LoggerName LogMessage

# log4j.appender.DRFA.layout.ConversionPattern=%d{ISO8601} %p %c: %m%n

# Debugging Pattern format

log4j.appender.DRFA.layout.ConversionPattern=%d{ISO8601} %-5p [%t]: %c{2} (%F:%M(%L)) - %m%n

# 

# console

# Add "console" to rootlogger above if you want to use this

# 

log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.target=System.err
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%d{yy/MM/dd HH:mm:ss} [%t]: %p %c{2}: %m%n
log4j.appender.console.encoding=UTF-8

# custom logging levels

# log4j.logger.xxx=DEBUG

# 

# Event Counter Appender

# Sends counts of logging messages at different severity levels to Hadoop Metrics.

# 

log4j.appender.EventCounter=org.apache.hadoop.hive.shims.HiveEventCounter
log4j.category.DataNucleus=ERROR,DRFA
log4j.category.Datastore=ERROR,DRFA
log4j.category.Datastore.Schema=ERROR,DRFA
log4j.category.JPOX.Datastore=ERROR,DRFA
log4j.category.JPOX.Plugin=ERROR,DRFA
log4j.category.JPOX.MetaData=ERROR,DRFA
log4j.category.JPOX.Query=ERROR,DRFA
log4j.category.JPOX.General=ERROR,DRFA
log4j.category.JPOX.Enhancer=ERROR,DRFA

# Silence useless ZK logs

log4j.logger.org.apache.zookeeper.server.NIOServerCnxn=WARN,DRFA
log4j.logger.org.apache.zookeeper.ClientCnxnSocketNIO=WARN,DRFA

请告知我们得到如下日志结构的原因是什么

hiveserver2.log.23-20180804-20180805

为了得到正确的答案：

hiveserver2.log.23