hadoop-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Brahma Reddy Battula <brahmareddy.batt...@huawei.com>
Subject RE: how to increate data node expire time
Date Tue, 25 Nov 2014 04:40:09 GMT
Hi Henry

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.

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: Henry Hung [YTHung1@winbond.com]
Sent: Tuesday, November 25, 2014 8:05 AM
To: user@hadoop.apache.org
Subject: how to increate data node expire time

Hi All,

In Hadoop 2.2.0, how to increase the data node expire time before name node list it as a dead

I want to shut down a data node for 30 minutes, and I don’t want the name node to list it
as dead node to prevent the re-replication process.

Best regards,

The privileged confidential information contained in this email is intended for use only by
the addressees as indicated by the original sender of this email. If you are not the addressee
indicated in this email or are not responsible for delivery of the email to such a person,
please kindly reply to the sender indicating this fact and delete all copies of it from your
computer and network server immediately. Your cooperation is highly appreciated. It is advised
that any unauthorized use of confidential information of Winbond is strictly prohibited; and
any information in this email irrelevant to the official business of Winbond shall be deemed
as neither given nor endorsed by Winbond.

View raw message