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Date: Tue, 19 May 2015 14:26:38 +0530
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 <CAB-meB93-uxW9w_6MgXUG72U4eeg4gb_+neniMuhwOk3ivOrdw@mail.gmail.com>
Subject: Re: how namenode decided which datanode are ready for a client
From: rajesh damera <d.rajesh15@gmail.com>
To: user@hadoop.apache.org
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Namenode usually checks for the jobs running on the datanodes, of which
tasktrackers keep a track of and decides if it still busy running a task.
On May 19, 2015 14:23, "rajesh damera" <d.rajesh15@gmail.com> wrote:

> Datanode availability is monitored and decided by Namenode. You usually
> get permissions, based on the type of user you are, to use a certain number
> of nodes to run your jobs. These limitations are set by administrators at
> user level
>
> Warm regards
> Rajesh Damera
> On May 19, 2015 14:08, "Himawan Mahardianto" <mahardianto@ugm.ac.id>
> wrote:
>
>> Hi guys, I know that every datanode where sending heartbeat to prove that
>> their alive but what method are used by namenode to decide which datanode
>> are available to client if all datanode where available?
>>
>> Best Regards
>>
>>
>

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<p dir=3D"ltr">Namenode usually checks for the jobs running on the datanode=
s, of which tasktrackers keep a track of and decides if it still busy runni=
ng a task.</p>
<div class=3D"gmail_quote">On May 19, 2015 14:23, &quot;rajesh damera&quot;=
 &lt;<a href=3D"mailto:d.rajesh15@gmail.com">d.rajesh15@gmail.com</a>&gt; w=
rote:<br type=3D"attribution"><blockquote class=3D"gmail_quote" style=3D"ma=
rgin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p dir=3D"ltr"=
>Datanode availability is monitored and decided by Namenode. You usually ge=
t permissions, based on the type of user you are, to use a certain number o=
f nodes to run your jobs. These limitations are set by administrators at us=
er level</p>
<p dir=3D"ltr">Warm regards<br>
Rajesh Damera</p>
<div class=3D"gmail_quote">On May 19, 2015 14:08, &quot;Himawan Mahardianto=
&quot; &lt;<a href=3D"mailto:mahardianto@ugm.ac.id" target=3D"_blank">mahar=
dianto@ugm.ac.id</a>&gt; wrote:<br type=3D"attribution"><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex"><div dir=3D"ltr">Hi guys,=C2=A0I know that every datanode whe=
re sending heartbeat to prove that their alive but=C2=A0what method are use=
d by namenode to decide which datanode are available to client if all datan=
ode where available?<div><br></div><div><div>Best Regards<br><div>=C2=A0<br=
></div></div></div></div>
</blockquote></div>
</blockquote></div>

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