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.
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: Henry Hung [ythu...@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 node?
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,
Henry
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