Hello Chandrashekhar, Active namenode will write to require shared storage and will not write to HDFS.. Please check following docs for reference
When Sharedstorage is Journalnode: <property> <name>dfs.namenode.shared.edits.dir</name> <value>qjournal://node1.example.com:8485;node2.example.com:8485;node3.example.com:8485/mycluster</value> </property> http://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html When Sharedstorage is NFS: <property> <name>dfs.namenode.shared.edits.dir</name> <value>file:///mnt/filer1/dfs/ha-name-dir-shared</value> </property> http://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithNFS.html Thanks & Regards Brahma Reddy Battula ________________________________ From: Chandrashekhar Kotekar [shekhar.kote...@gmail.com] Sent: Thursday, February 12, 2015 5:01 PM To: user@hadoop.apache.org Subject: journal node shared edits directory should be present on HDFS or NAS or anything else? Hi, I am trying to configure name node HA and I want to further configure automatic fail over. I am confused about 'dfs.namenode.shared.edits.dir' configuration. Documentation says that "active namde node writes to shared storage." I would like to know if this means that name nodes write it on HDFS or do they require shared storage like NAS or SAN or something else. Regards, Chandrash3khar Kotekar Mobile - +91 8600011455
