home ： https://mesos.github.io/chronos/
Chronos is a replacement for cron. It is a distributed and fault-tolerant scheduler that runs on top of Apache Mesos that can be used for job orchestration. It supports custom Mesos executors as well as the default command executor. Thus by default, Chronos executes sh (on most systems bash) scripts.
Chronos can be used to interact with systems such as Hadoop (incl. EMR), even if the Mesos slaves on which execution happens do not have Hadoop installed. Included wrapper scripts allow transfering files and executing them on a remote machine in the background and using asynchronous callbacks to notify Chronos of job completion or failures. Chronos is also natively able to schedule jobs that run inside Docker containers.
Chronos has a number of advantages over regular cron. It allows you to schedule your jobs using ISO8601 repeating interval notation, which enables more flexibility in job scheduling. Chronos also supports the definition of jobs triggered by the completion of other jobs. It supports arbitrarily long dependency chains.
Chronos comes with a UI which can be used to add, delete, list, modify and run jobs. It can also show a graph of job dependencies. The screenshot should give you a good idea of what Chronos can do.
Additionally, Chronos can show statistics on past job execution. This may include aggregate statistics such as number of successful and failed executions. Per job execution statistics (i.e. duration and status) are also available, if a Cassandra cluster is attached to Chronos. Please see theConfiguration section on how to do this.
You can either download an archive of the latest Chronos release using the Download button above or follow the instructions on the getting started page to install packages for popular Linux distributions.
原文：http://my.oschina.net/httpssl/blog/513721