Himawan: Please see the following constants in hadoop-hdfs-project//hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java :
public static final String DFS_NAMENODE_HEARTBEAT_RECHECK_INTERVAL_KEY = "dfs.namenode.heartbeat.recheck-interval"; public static final int DFS_NAMENODE_HEARTBEAT_RECHECK_INTERVAL_DEFAULT = 5*60*1000; Cheers On Sat, Mar 28, 2015 at 5:48 PM, Himawan Mahardianto <mahardia...@ugm.ac.id> wrote: > 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 >> > >
