tws scheduler

I. OverviewThe event scheduler is another feature added in MySQL 5.1. It can be used as a scheduled task scheduler to replace some timer tasks that can only be completed by the operating system task scheduler>. For example, crontabe in Linux can be executed only once per minute, while the MySQL event scheduler can exec

Hadoop is a distributed system infrastructure under the Apache Foundation. It has two core components: Distributed File System HDFS, which stores files on all storage nodes in the hadoop cluster; it consists of namenode and datanode. the distributed computing engine mapreduce is composed of jobtracker and tasktracker. Hadoop allows you to easily develop distributed applications based on your business needs without understanding the underlying details of the distributed system.Program. In actua

ObjectiveBy default, RxJava follows a thread-invariant principle when a thread is not specified, that is, in which thread calls subscribe (), on which thread the event is produced, and on which thread the event is consumed.If you need to switch threads, you need to use the Scheduler (scheduler).Schedulers part of the main from the "to Android developers RxJava detailed"schedulers IntroductionIn RxJava, the

http://www.mkyong.com/spring/spring-jdk-timer-scheduler-example/In this example, you'll use the Spring ' s Scheduler API to schedule a task.1. Scheduler TaskCreate A Scheduler task ...Package Com.mkyong.common; public class Runmetask{public void PrintMe () {System.out.println ("Run Me ~");}}Spring comes with a Methodin

Article transferred from http://blog.csdn.net/l454822901/article/details/51829307Recently found that the real bump, spring upgrade to 3 after the original has a Task scheduler, has been using quartz. In fact, it's not quartz bad, just by comparison, using spring task is really a lot easier, whether it's understanding or using.Spring task provides two ways to configure, as you can imagine, or one is annotation (callout), and the other is XML configurat

* * * Root cat/etc/fatab executed every three hours from 8 to 8 o'clock in the first minute of the night.Every two days 2:7 A.M. will be the etc under all the files packaged into etc-' date +%f '. tar.xz format in the backup directory7 2 */2 * * Root tar-jcf/backup/etc-' date +%f '. tar.xz/etc/*Monday to Friday 8 o'clock to 18, twice every 3 hours.2,32 8-18/3 * * 1-5B, PATH:/bin:/sbin:/usr/bin:/usr/sbinIf it is a command: use absolute pathIf it's a script: Customize the path in the scriptC, Re

/cron.daily, tasks that have not been performed within a certain period, 5 minutes after power-on7cron.weeklyNice run-parts/etc/cron.weekly, a task that has not been performed in a certain period and is executed 25 minutes after booting@monthlycron.monthlyNice run-parts/etc/cron.monthly, a task that has not been performed in a certain period and is executed 45 minutes after bootII. Mail command: Lists the mailing list. Quit the message with quit.1, through-s to specify the subject subject, and t

First, the Task plan management--crontabEdit Scheduled Task: Crontab-e "-u user Name"View Scheduled Tasks: Crontab-l "-u user Name"Delete Scheduled Task: Crontab-r "-u user Name"Root user can manage scheduled tasks for a specified userOrdinary users can only manage their own scheduled tasksII. configuration format of the task plan*　　 *　　 *　　 *　　 *Minute hour date Month weekMinutes: The value is any integer from 0~59Hours: The value is any integer from 0~23Date: The value is any integer from 1~31

minutes to perform an "echo" How is it? " ；*/3 * * * */bin/echo "How is it?"2, weekly 2, 4, 6 backup/etc/directory to the/backup directory, the file name of the backup to be the beginning of the etc_ and keep up with the date of the day as the file name;0 0 * * 2,4,6/bin/tar-jcf etc_ ' date +%f '. tar.xz/etc/*3, daily 6, 9, 12, 15, 16, 17, 18 View all the file systems mounted on the current system, and append the results of the view to the/tmp/mounts.txt file;0 6,9,12,15-17 * * */bin/mount >>/t

============================> >/statistics/meminfo.txt|/bin/egrep ' ^ (s| M) ' /proc/meminfo>>/statistics/meminfo.txt# view meminfo.sh permissions to ensure that performers have execute permissions [[email Protected]sh_test]#lltotal8-rwxr--r--. 1rootroot56sep 811:11fstab_backup.sh-rwxr--r--. 1rootroot129Sep 813:24meminfo.sh# set up user cron tasks [[emailprotected]~]#crontab-e# Edit/var/ Spool/cron/root file content for 00***/root/sh_test/meminfo.sh# view root user cron Task List [[email Protect

To view system process commands:1. Utility Command PS-EF View all background processes generally use the filtering process with grep2.ps-fu root View all root processesPID Process number PPID The parent process number TTY process related terminal2.top command Continuous monitoring processphysical memory is not enough to see Swap: Swap space sizein the The Top command presses M or P to see the processes that consume the most memory and cupsPstree View process relationship Pstree can also add

at any moment. For example, the day, month, and week of an example are *, which means that the follow-up order is executed 12:00 on the day of the week, regardless of the month. , (comma) Represents the meaning of the separation period. For example, if the work to be performed is 3:00 and 6:00, it will be:0 3,6 * * commandThe time is still five columns, but the second column is 3,6, representing 3 and 6. -(minus) Represents a period of time, for example, be