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Date: Wed, 30 Jan 2013 21:42:38 +0530
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 <CAORpBshT3AP1UkLRMaTPgGmDRaz1aMUgkZ3U2Qd3aW0LAFbH1A@mail.gmail.com>
Subject: Re: How to find Blacklisted Nodes via cli.
From: Nitin Pawar <nitinpawar432@gmail.com>
To: user@hadoop.apache.org
Cc: cdh-user@cloudera.org
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*bin/hadoop dfsadmin -report should give you what you are looking for.*
*
*
*a node is blacklisted only if there are too many failures on a particular
node. You can clear it by restarting the particular datanode or tasktracker
service. This is for the better performance of your hadoop cluster to
remove a node where too many failures are happening so that you can figure
out the reason and then add it back in cluster. you can also exclude the
node from the cluster all together. *
*
*
*I never tried myself removing a node from blacklist on the fly so not sure
how that is done. I will wait if someone can tell me witout restart its
possible or not (without increasing the failure thresholds ) *


On Wed, Jan 30, 2013 at 9:35 PM, Dhanasekaran Anbalagan
<bugcy013@gmail.com>wrote:

> Hi Guys,
>
> How to find Blacklisted Nodes via, command line. I want to see job
> Tracker Blacklisted Nodes and hdfs Blacklisted Nodes.
>
> and also how to clear blacklisted nodes to clear start. The only option to
> restart the service. some other way clear the Blacklisted Nodes.
>
> please guide me.
>
> -Dhanasekaran.
>
> Did I learn something today? If not, I wasted it.
>


-- 
Nitin Pawar

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<div dir=3D"ltr"><span style=3D"color:rgb(0,0,255)"><strong>bin/hadoop dfsa=
dmin -report should give you what you are looking for.</strong></span><br><=
div><span style=3D"color:rgb(0,0,255)"><strong><br></strong></span></div><d=
iv style>
<font color=3D"#0000ff"><b>a node is blacklisted only if there are too many=
 failures on a particular node. You can clear it by restarting the particul=
ar datanode or tasktracker service. This is for the better performance of y=
our hadoop cluster to remove a node where too many failures are happening s=
o that you can figure out the reason and then add it back in cluster. you c=
an also exclude the node from the cluster all together.=A0</b></font></div>
<div style><font color=3D"#0000ff"><b><br></b></font></div><div style><font=
 color=3D"#0000ff"><b>I never tried myself removing a node from blacklist o=
n the fly so not sure how that is done. I will wait if someone can tell me =
witout restart its possible or not (without increasing the failure threshol=
ds )=A0</b></font></div>
</div><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Wed,=
 Jan 30, 2013 at 9:35 PM, Dhanasekaran Anbalagan <span dir=3D"ltr">&lt;<a h=
ref=3D"mailto:bugcy013@gmail.com" target=3D"_blank">bugcy013@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 Guys,<div><br></div><div=
>How to find=A0Blacklisted Nodes via, command line. I want to see job Track=
er=A0Blacklisted Nodes and hdfs=A0Blacklisted Nodes.</div>
<div><br></div><div>and also how to clear blacklisted nodes to clear start.=
 The only=A0option=A0to restart the service. some other way clear the=A0Bla=
cklisted Nodes.</div>

<div><br></div><div>please guide me.<br></div><div><br></div><div>-Dhanasek=
aran.</div><div><br></div><div><div>Did I learn something today? If not, I =
wasted it.</div>
</div></div>
</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br>Nitin Pawar<=
br>
</div>

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