定时清除Zookeeper日志
定时清除Zookeeper日志命令格式：
[*]java -cp zookeeper.jar:log4j.jar:conf org.apache.zookeeper.server.PurgeTxnLog -n
举例：
[*]java -cp zookeeper.jar:log4j.jar:conf org.apache.zookeeper.server.PurgeTxnLog /log/xres/zookeeper/zk_trlog /www/xres/app/zk_data -n 10
定时清除zookeeper日志和快照数据非常简单，只需简单3步。
Step1：在zookeeper/bin目录建立purgeTxnLog.sh文件，内容如下所示：
[*]#!/bin/sh
[*]
[*]# Only follow symlinks if readlink supports it
[*]if readlink -f "$0" > /dev/null 2>&1
[*]then
[*]ZOOBIN=`readlink -f "$0"`
[*]else
[*]ZOOBIN="$0"
[*]fi
[*]ZOOBINDIR=`dirname "$ZOOBIN"`
[*]
[*]. "$ZOOBINDIR"/zkEnv.sh
[*]
[*]#echo "Purge transaction log is starting..."
[*]PATH="/usr/local/bin:/usr/local/sbin:/usr/sbin:/sbin:/usr/java/jdk1.6.0_21/bin:/usr/java/jdk1.6.0_21/jre/bin:/bin:/home/smdev/bin:$PATH"
[*]export PATH
[*]#echo "PATH=$PATH"
[*]#echo "CLASSPATH=$CLASSPATH"
[*]
[*]java -cp "$CLASSPATH" org.apache.zookeeper.server.PurgeTxnLog /log/xres/zookeeper/zk_trlog /www/xres/app/zk_data -n 10
[*]
[*]#echo "Purge transaction log is finished."
Step2：创建cron任务。
[*]$ crontab –e
任务内容如下：
[*]0 */1 * * * sh /www/xres/app/zookeeper-3.3.3/bin/purgeTxnLog.sh >> /log/xres/zookeeper/log/purgeTxnLog.log
Step3：启动服务
[*]$service crond start
到此为止，定时清除zookeeper日志和快照数据的全部工作已完成。
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