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Date: Mon, 25 Feb 2013 10:40:51 +0800
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 <CALr1C9o+kMg0kTUwZfi4vcEoPnaKw0cL4BEBie5=2Vq7OqHeAw@mail.gmail.com>
Subject: Re: One NameNode keeps Rolling Edit Log on HDFS Federation
From: Azuryy Yu <azuryyyu@gmail.com>
To: user@hadoop.apache.org
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I think you mixed federation with HA. am I right?

If another name node hasn't changes, then It doesn't do any edit log
rolling. federated NNs don't keep concurrency( I think you want say keep
sync-able?)


On Sun, Feb 24, 2013 at 11:09 PM, YouPeng Yang <yypvsxf19870706@gmail.com>wrote:

> Hi All
>
>  I'm testing the HDFS Federation.I have 2 namenodes in  my cluster.
>  I find that it is  Rolling Edit Log continuously on one
> namenode,however the other one  changes nothing.
>
>  My question :
>  1. Is it the right situation.
>  2. I have thought that the two namenodes shoud keep concurrency.
> why they get differences.
>  3. is there any advanced docs about HDFS Federation.
>
> thanks.
>
> Regards.
>
>
>
>

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<div dir=3D"ltr"><div>I think you mixed federation with HA. am I right?<br>=
<br></div>If another name node hasn&#39;t changes, then It doesn&#39;t do a=
ny edit log rolling. federated NNs don&#39;t keep concurrency( I think you =
want say keep sync-able?)<br>
</div><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Sun,=
 Feb 24, 2013 at 11:09 PM, YouPeng Yang <span dir=3D"ltr">&lt;<a href=3D"ma=
ilto:yypvsxf19870706@gmail.com" target=3D"_blank">yypvsxf19870706@gmail.com=
</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr">Hi All<div>=A0 =A0</div><di=
v>=A0I&#39;m testing the=A0<span style=3D"color:rgb(51,51,51);font-family:V=
erdana,Helvetica,Arial,sans-serif;font-size:x-small">HDFS Federation.I have=
 2 namenodes in =A0my cluster.</span><br>
</div>
<div><span style=3D"color:rgb(51,51,51);font-family:Verdana,Helvetica,Arial=
,sans-serif;font-size:x-small">=A0I find that it is =A0R</span><font color=
=3D"#333333" face=3D"Verdana, Helvetica, Arial, sans-serif" size=3D"1">olli=
ng Edit Log=A0continuously on one =A0 namenode,however the other one =A0cha=
nges nothing.</font></div>

<div><font color=3D"#333333" face=3D"Verdana, Helvetica, Arial, sans-serif"=
 size=3D"1"><br></font></div><div><font color=3D"#333333" face=3D"Verdana, =
Helvetica, Arial, sans-serif" size=3D"1">=A0My question :</font></div><div>
<font color=3D"#333333" face=3D"Verdana, Helvetica, Arial, sans-serif" size=
=3D"1">=A01. Is it the right=A0situation.</font></div><div><font color=3D"#=
333333" face=3D"Verdana, Helvetica, Arial, sans-serif" size=3D"1">=A02. I h=
ave thought that the two namenodes shoud keep=A0</font>concurrency.</div>

<div>why they get differences.</div><div>=A03. is there any advanced docs a=
bout=A0<span style=3D"color:rgb(51,51,51);font-family:Verdana,Helvetica,Ari=
al,sans-serif;font-size:x-small">HDFS Federation.</span></div><div>
<span style=3D"color:rgb(51,51,51);font-family:Verdana,Helvetica,Arial,sans=
-serif;font-size:x-small"><br></span></div><div><span style=3D"color:rgb(51=
,51,51);font-family:Verdana,Helvetica,Arial,sans-serif;font-size:x-small">t=
hanks.</span></div>

<div><span style=3D"color:rgb(51,51,51);font-family:Verdana,Helvetica,Arial=
,sans-serif;font-size:x-small"><br></span></div><div><span style=3D"color:r=
gb(51,51,51);font-family:Verdana,Helvetica,Arial,sans-serif;font-size:x-sma=
ll">Regards.</span></div>

<div><br></div><div><br></div><div><font color=3D"#333333" face=3D"Verdana,=
 Helvetica, Arial, sans-serif" size=3D"1">=A0</font></div></div>
</blockquote></div><br></div>

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