一、操作日志
首先附上kafka 操作日志配置文件：log4j.properties
根据相应的需要设置日志。
#日志级别覆盖规则 优先级：ALL < DEBUG < INFO <WARN < ERROR < FATAL < OFF
#1.子日志log4j.logger会覆盖主日志log4j.rootLogger，这里设置的是日志输出级别，Threshold设置appender的日志接收级别；
#2.log4j.logger级别低于Threshold,appender接收级别取决于Threshold级别；
#3.log4j.logger级别高于Threshold,appender接收级别取决于log4j.logger级别，因为输出里就没有Threshold要求的日志；
#4.子logger设置，主要与rootLogger区分开打印日志 一般与log4j.additivity配合使用
#log4j.additivity 是否继承父Logger的输出源（appender),默认是true
#true 在stdout, kafkaAppender里输出 也会在stateChangeAppender输出
#这里需要单独输出 所以设置为false 只会在stateChangeAppender输出
#log4j.logger后面如果没有appender，则默认使用log4j.rootLogger后面设置的appender
#如果使用org.apache.log4j.RollingFileAppender 可以使用MaxFileSize设置最大文件大小 MaxBackupIndex设置最大文件数量
#主日志设置
log4j.rootLogger=ERROR, stdout, kafkaAppender
#控制台的appender和layout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.kafkaAppender.Append=true log4j.appender.kafkaAppender.Threshold=ERROR
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=[%d] %p %m (%c)%n
#kafkaAppender的appender和layout
log4j.appender.kafkaAppender=org.apache.log4j.DailyRollingFileAppender
log4j.appender.kafkaAppender.DatePattern='.'yyyy-MM-dd-HH
log4j.appender.kafkaAppender.File=${kafka.logs.dir}/server.log
log4j.appender.kafkaAppender.Append=true log4j.appender.kafkaAppender.Threshold=ERROR
log4j.appender.kafkaAppender.layout=org.apache.log4j.PatternLayout
log4j.appender.kafkaAppender.layout.ConversionPattern=[%d] %p %m (%c)%n
#状态变化日志
log4j.logger.state.change.logger=ERROR, stateChangeAppender
log4j.additivity.state.change.logger=false log4j.appender.stateChangeAppender=org.apache.log4j.DailyRollingFileAppender
log4j.appender.stateChangeAppender.DatePattern='.'yyyy-MM-dd-HH
log4j.appender.stateChangeAppender.File=${kafka.logs.dir}/state-change.log
log4j.appender.stateChangeAppender.layout=org.apache.log4j.PatternLayout
log4j.appender.stateChangeAppender.layout.ConversionPattern=[%d] %p %m (%c)%n
#请求处理
log4j.logger.kafka.request.logger=ERROR, requestAppender
log4j.additivity.kafka.request.logger=false log4j.logger.kafka.network.Processor=ERROR, requestAppender
log4j.additivity.kafka.network.Processor=false log4j.logger.kafka.server.KafkaApis=ERROR, requestAppender
log4j.additivity.kafka.server.KafkaApis=false log4j.logger.kafka.network.RequestChannel$=ERROR, requestAppender
log4j.additivity.kafka.network.RequestChannel$=false log4j.appender.requestAppender=org.apache.log4j.DailyRollingFileAppender
log4j.appender.requestAppender.DatePattern='.'yyyy-MM-dd-HH
log4j.appender.requestAppender.File=${kafka.logs.dir}/kafka-request.log
log4j.appender.requestAppender.layout=org.apache.log4j.PatternLayout
log4j.appender.requestAppender.layout.ConversionPattern=[%d] %p %m (%c)%n
#kafka-logs清理
log4j.logger.kafka.log.LogCleaner=ERROR, cleanerAppender
log4j.additivity.kafka.log.LogCleaner=false log4j.appender.cleanerAppender=org.apache.log4j.DailyRollingFileAppender
log4j.appender.cleanerAppender.DatePattern='.'yyyy-MM-dd-HH
log4j.appender.cleanerAppender.File=${kafka.logs.dir}/log-cleaner.log
log4j.appender.cleanerAppender.layout=org.apache.log4j.PatternLayout
log4j.appender.cleanerAppender.layout.ConversionPattern=[%d] %p %m (%c)%n
#controller
log4j.logger.kafka.controller=ERROR, controllerAppender
log4j.additivity.kafka.controller=false log4j.appender.controllerAppender=org.apache.log4j.DailyRollingFileAppender
log4j.appender.controllerAppender.DatePattern='.'yyyy-MM-dd-HH
log4j.appender.controllerAppender.File=${kafka.logs.dir}/controller.log
log4j.appender.controllerAppender.layout=org.apache.log4j.PatternLayout
log4j.appender.controllerAppender.layout.ConversionPattern=[%d] %p %m (%c)%n
#authorizer
log4j.logger.kafka.authorizer.logger=ERROR, authorizerAppender
log4j.additivity.kafka.authorizer.logger=false log4j.appender.authorizerAppender=org.apache.log4j.DailyRollingFileAppender
log4j.appender.authorizerAppender.DatePattern='.'yyyy-MM-dd-HH
log4j.appender.authorizerAppender.File=${kafka.logs.dir}/kafka-authorizer.log
log4j.appender.authorizerAppender.layout=org.apache.log4j.PatternLayout
log4j.appender.authorizerAppender.layout.ConversionPattern=[%d] %p %m (%c)%n
#ZkClient
log4j.logger.org.I0Itec.zkclient.ZkClient=ERROR
#zookeeper
log4j.logger.org.apache.zookeeper=ERROR
#kafka
log4j.logger.kafka=ERROR
#org.apache.kafka
log4j.logger.org.apache.kafka=ERROR
其次 kafka默认打印GC日志，如下，
[cluster@PCS102 logs]$ ls
kafka-authorizer.log kafkaServer-gc.log.3 kafkaServer-gc.log.8 server.log.2018-10-22-14
kafka-request.log kafkaServer-gc.log.4 kafkaServer-gc.log.9 server.log.2018-10-22-15
kafkaServer-gc.log.0 kafkaServer-gc.log.5 kafkaServer.out
kafkaServer-gc.log.1 kafkaServer-gc.log.6 server.log
kafkaServer-gc.log.2.current kafkaServer-gc.log.7 server.log.2018-10-22-13
生产是不需要的 需要关掉，kafka home bin目录下面有个kafka-run-class.sh脚本 vim编辑一下
将参数 KAFKA_GC_LOG_OPTS=" " 设置为空格即可，重启kafka之后就不再打印GC日志了。
[cluster@PCS102 bin]$ vim kafka-run-class.sh
GC_FILE_SUFFIX='-gc.log'
GC_LOG_FILE_NAME=''
if [ "x$GC_LOG_ENABLED" = "xtrue" ]; then
GC_LOG_FILE_NAME=$DAEMON_NAME$GC_FILE_SUFFIX
KAFKA_GC_LOG_OPTS="-Xloggc:$LOG_DIR/$GC_LOG_FILE_NAME -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=100M"
KAFKA_GC_LOG_OPTS=" "
fi
可以写个定时清理脚本来清除日志结合
crontab ：0 0 2 * * ? /home/cluster/kafka211/bin/cleanupkafkalog.sh
#!/bin/bash
# log dir
logDir=/home/cluster/kafka211/logs
#keep 60 file
count=60
count=$[$count+1]
LOGNUM=`ls -l /home/cluster/kafka211/logs/server.log.* |wc -l`
if [ $LOGNUM -gt 0 ]; then
ls -t $logDir/server.log.* | tail -n +$count | xargs rm -f
fi
#kafkaServer.out
if [ -e "$logDir/kafkaServer.out" ]; then
rm -f /home/cluster/kafka211/logs/kafkaServer.out
fi
二、删除主题和主题对应消息数据
举例删除主题：t1205
(1)在kafka集群中删除topic，当前topic被标记成删除。
./kafka-topics.sh --zookeeper node3:2181,node4:2181,node5:2181 --delete --topic t1205
(2)在每台broker节点上删除当前这个topic对应的真实数据。
删除kafka相关的数据目录，数据目录请参考目标机器上的kafka配置：server.properties -> log.dirs=/var/kafka/log/tmp
rm -r /var/kafka/log/tmp/t1205*
(3)进入zookeeper客户端，删除topic信息
rmr /brokers/topics/t1205
(4)删除zookeeper中被标记为删除的topic信息
rmr /admin/delete_topics/t1205
最后重启ZK和kafka集群，查看是否还有
./kafka-topics.sh --list --zookeeper node3:2181,node4:2181,node5:2181
