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From: Brahma Reddy Battula <brahmareddy.battula@huawei.com>
To: "user@hadoop.apache.org" <user@hadoop.apache.org>
Subject: RE: How to know when datanode are marked dead by namenode
Thread-Topic: How to know when datanode are marked dead by namenode
Thread-Index: AQHQaUhAHHfq2A+bhEeRB++jJLlfkJ0xxb/C
Date: Sat, 28 Mar 2015 11:42:20 +0000
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HI

The NameNode updates this detail after 10.30 minutes by default. You can se=
e the dead and live datanodes at that time.

It computes this heartbeatExpireInterval time by the following formula

  heartbeatExpireInterval =3D 2 * heartbeatRecheckInterval +
      10 * 1000* heartbeatInterval

where heartbeatRecheckInterval is defined by the configuration dfs.namenode=
.heartbeat.recheck-interval which is 5 minutes by default and heartbeatInte=
rval by dfs.heartbeat.interval which is 3 seconds by default.

Hence
heartbeatExpireInterval =3D 10.30 minutes


SO If you want keep more time, you can configure dfs.namenode.heartbeat.rec=
heck-interval based one your requirement..


Thanks & Regards

Brahma Reddy Battula


________________________________
From: Himawan Mahardianto [mahardianto@ugm.ac.id]
Sent: Saturday, March 28, 2015 4:42 PM
To: user@hadoop.apache.org
Subject: How to know when datanode are marked dead by namenode

Hi guys I'm newbie here, do you know how to time calculation when datanode =
are marked dead by namenode, what parameters on HDFS-SITE.xml should I look=
 for to calculate it, and how can I reduce dead time from default 10 minute=
s to 5 minutes or increase it to 20 minutes?
Thank's before

best regards
Himawan Mahardianto

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<html dir=3D"ltr">
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style id=3D"owaParaStyle" type=3D"text/css">P {margin-top:0;margin-bottom:=
0;}</style>
</head>
<body ocsi=3D"0" fpstyle=3D"1">
<div style=3D"direction: ltr;font-family: Tahoma;color: #000000;font-size: =
10pt;">HI<br>
<br>
The NameNode updates this detail after 10.30 minutes by default. You can se=
e the dead and live datanodes at that time.<br>
<br>
It computes this heartbeatExpireInterval time by the following formula<br>
<br>
&nbsp; heartbeatExpireInterval =3D 2 * heartbeatRecheckInterval &#43;<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 10 * 1000* heartbeatInterval<br>
<br>
where heartbeatRecheckInterval is defined by the configuration dfs.namenode=
.heartbeat.recheck-interval which is 5 minutes by default and heartbeatInte=
rval by dfs.heartbeat.interval which is 3 seconds by default.<br>
<br>
Hence<br>
heartbeatExpireInterval =3D 10.30 minutes<br>
<br>
<br>
SO If you want keep more time, you can configure dfs.namenode.heartbeat.rec=
heck-interval based one your requirement..<br>
<div><br>
<br>
<div style=3D"font-family:Tahoma; font-size:13px">
<p><font color=3D"#993300">Thanks &amp; Regards</font> <br>
</p>
<p><font color=3D"#0000ff">Brahma Reddy Battula</font></p>
<p>&nbsp;</p>
<p><font color=3D"#ff0000"><strong><br>
</strong></font></p>
</div>
</div>
<div style=3D"font-family: Times New Roman; color: #000000; font-size: 16px=
">
<hr tabindex=3D"-1">
<div style=3D"direction: ltr;" id=3D"divRpF131473"><font color=3D"#000000" =
face=3D"Tahoma" size=3D"2"><b>From:</b> Himawan Mahardianto [mahardianto@ug=
m.ac.id]<br>
<b>Sent:</b> Saturday, March 28, 2015 4:42 PM<br>
<b>To:</b> user@hadoop.apache.org<br>
<b>Subject:</b> How to know when datanode are marked dead by namenode<br>
</font><br>
</div>
<div></div>
<div>
<div dir=3D"ltr">Hi guys I'm newbie here, do you know how to time calculati=
on when datanode are marked dead by namenode, what parameters on HDFS-SITE.=
xml should I look for to calculate it, and how can I reduce dead time from =
default 10 minutes to 5 minutes or
 increase it to 20 minutes?
<div>Thank's before</div>
<div><br>
</div>
<div>best regards</div>
<div>Himawan Mahardianto</div>
</div>
</div>
</div>
</div>
</body>
</html>

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