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From Himawan Mahardianto <mahardia...@ugm.ac.id>
Subject Re: How to know when datanode are marked dead by namenode
Date Sun, 29 Mar 2015 00:48:57 GMT
Thank you for your response and explanation, but I couldn't find "
dfs.namenode.heartbeat.recheck-interval" parameter on
http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-hdfs/hdfs-default.xml
that you told before, maybe any other formula with this version?

On Sat, Mar 28, 2015 at 6:42 PM, Brahma Reddy Battula <
brahmareddy.battula@huawei.com> wrote:

>  HI
>
> The NameNode updates this detail after 10.30 minutes by default. You can
> see the dead and live datanodes at that time.
>
> It computes this heartbeatExpireInterval time by the following formula
>
>   heartbeatExpireInterval = 2 * heartbeatRecheckInterval +
>       10 * 1000* heartbeatInterval
>
> where heartbeatRecheckInterval is defined by the configuration
> dfs.namenode.heartbeat.recheck-interval which is 5 minutes by default and
> heartbeatInterval by dfs.heartbeat.interval which is 3 seconds by default.
>
> Hence
> heartbeatExpireInterval = 10.30 minutes
>
>
> SO If you want keep more time, you can configure
> dfs.namenode.heartbeat.recheck-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 minutes to 5 minutes or increase it to 20 minutes?
> Thank's before
>
>  best regards
> Himawan Mahardianto
>

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