In Hadoop 2.4, we have delivered the timeline server at a preview stage, which actually can serve some generic YARN application history as well as the framework specific information. Due to the development logistics, we have created the two concepts: History Server and Timeline Server. To be simple, you can consider the history server of the service of the generic YARN application information, while consider the timeline server of the service of the framework specific information. Importantly, we just have one daemon, which includes both services, and which we'd like to call timeline server (unfortunately, the confusing thing is that the command to start the daemon is "historyserver"). We're going on working on the timeline server to integrate these two parts, including refactoring the names.
BTW, if you mean MapReduce JobHistoryServer by HistoryServer, it's a different daemon, which serves the historic information of MapReduce jobs only. On Tue, Apr 22, 2014 at 8:44 PM, sam liu <[email protected]> wrote: > Hi Experts, > > I am confusing on these two concepts. Could you help explain the > differences? > > Thanks! > -- Zhijie Shen Hortonworks Inc. http://hortonworks.com/ -- CONFIDENTIALITY NOTICE NOTICE: This message is intended for the use of the individual or entity to which it is addressed and may contain information that is confidential, privileged and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, you are hereby notified that any printing, copying, dissemination, distribution, disclosure or forwarding of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and delete it from your system. Thank You.
