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.batt...@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 [mahardia...@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 >
