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Date: Wed, 2 Jul 2014 20:12:36 -0400
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 <CAPwpkBt95uAwPudSRTDPrijXiwHErxJ2hNQ6V7jq+kGwkuSQFw@mail.gmail.com>
Subject: Re: A Datanode shutdown question?
From: varun kumar <varun.uid@gmail.com>
To: afsanjar@gmail.com, user <user@hadoop.apache.org>
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--047d7b4148feb3dca104fd3eddaf
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Generally Datanode sends it heartbeat to namenode for  every 3 seconds.

If datanode stops sending its heartbeat to name node with in 3
seconds,Namenode thinks it is dead.


On Wed, Jul 2, 2014 at 5:03 PM, MrAsanjar . <afsanjar@gmail.com> wrote:

> If a datanode is shut-downed by calling "hadoop-daemons.sh stop datanode",
> how would the namenode gets notified that a datanode is no longer active?
> does datanode send a SHUTDOWN_MSG to the namenode?  does namenode has to
> wait for heartbeat timeout?
>



-- 
Regards,
Varun Kumar.P

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<div dir=3D"ltr">Generally Datanode sends it heartbeat to namenode for =C2=
=A0every 3 seconds.<div><br></div><div style>If datanode stops sending its =
heartbeat to name node with in 3 seconds,Namenode thinks it is dead.</div><=
/div>
<div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Wed, Jul 2=
, 2014 at 5:03 PM, MrAsanjar . <span dir=3D"ltr">&lt;<a href=3D"mailto:afsa=
njar@gmail.com" target=3D"_blank">afsanjar@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">If a datanode is shut-downed by calling &quot;hadoop-daemo=
ns.sh stop datanode&quot;, how would the namenode gets notified that a data=
node is no longer active? does datanode send a SHUTDOWN_MSG to the namenode=
?=C2=A0 does namenode has to wait for heartbeat timeout?<br>

</div>
</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br><div><font c=
olor=3D"#3333ff" face=3D"trebuchet ms,sans-serif">Regards,</font></div>
<div><font color=3D"#3333ff" face=3D"trebuchet ms,sans-serif">Varun Kumar.P=
</font></div>
</div>

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