So, if I want to change the default dead time, I have to compile from source first? Is there any other way that I use to change dead time from native hadoop-2.6 (not from source)? Or maybe the native doesn't have a feature to change the dead time?
Thank's all for the responses :) On Sun, Mar 29, 2015 at 8:13 AM, Ted Yu <yuzhih...@gmail.com> wrote: > 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 >>> >> >> >
