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Date: Tue, 22 Apr 2014 21:56:32 -0700
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 <CAJS6+b6wFs+2NNGQ-Uby4P1=9UHRsvqri8JQW=waoEW4ZEBWGg@mail.gmail.com>
Subject: Re: Differences between HistoryServer and Yarn TimeLine server?
From: Zhijie Shen <zshen@hortonworks.com>
To: user@hadoop.apache.org
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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 <samliuhadoop@gmail.com> wrote:

> Hi Experts,
>
> I am confusing on these two concepts. Could you help explain the
> differences?
>
> Thanks!
>


-- 
Zhijie Shen
Hortonworks Inc.
http://hortonworks.com/

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<div dir=3D"ltr"><div>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 developme=
nt logistics, we have created the two concepts: History Server and Timeline=
 Server. To be simple, you can consider the history server of the service o=
f the generic YARN application information, while consider the timeline ser=
ver of the service of the framework specific information. Importantly, we j=
ust have one daemon, which includes both services, and which we&#39;d like =
to call timeline server (unfortunately, the confusing thing is that the com=
mand to start the daemon is &quot;historyserver&quot;). We&#39;re going on =
working on the timeline server to integrate these two parts, including refa=
ctoring the names.</div>
<div><br></div>BTW, if you mean MapReduce JobHistoryServer by HistoryServer=
, it&#39;s a different daemon, which serves the historic information of Map=
Reduce jobs only.</div><div class=3D"gmail_extra"><br><br><div class=3D"gma=
il_quote">
On Tue, Apr 22, 2014 at 8:44 PM, sam liu <span dir=3D"ltr">&lt;<a href=3D"m=
ailto:samliuhadoop@gmail.com" target=3D"_blank">samliuhadoop@gmail.com</a>&=
gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 =
0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir=3D"ltr"><div><div>Hi Experts,<br><br></div>I am confusing on these=
 two concepts. Could you help explain the differences? <br><br></div>Thanks=
!<br></div>
</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br>Zhijie Shen<=
div>Hortonworks Inc.</div><div><a href=3D"http://hortonworks.com/" target=
=3D"_blank">http://hortonworks.com/</a><br></div>
</div>

<br>
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nt-family:Arial,sans-serif;font-size:10px"><span style=3D"color:rgb(128,128=
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nd 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, dis=
semination, distribution, disclosure or forwarding of this communication is=
 strictly prohibited. If you have received this communication in error, ple=
ase contact the sender immediately and delete it from your system. Thank Yo=
u.</span>
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