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RE: How to set Rack Id of DataNodes? - HDFS - [mail # user]
...Hi Mohammad,     Yes that's correct your "rack awareness" script takes the IP address of a node and returns the rack name/id.  You then just have to ensure the script is execu...
   Author: Vijay Thakorlal, 2013-04-15, 12:50
RE: NameNode failure and recovery! - Hadoop - [mail # user]
...Hi Rahul,     The SNN does not act as a backup / standby NameNode in the event of failure.      The sole purpose of the Secondary NameNode (or as it’s otherwise / mo...
   Author: Vijay Thakorlal, 2013-04-03, 14:56
RE: In Compatible clusterIDs - MapReduce - [mail # user]
...Hi Nagarjuna,     What's is in your /etc/hosts file? I think the line in logs where it says "DataNodeRegistration(0.0.0.0 [..]", should be the hostname or IP of the datanode (124.1...
   Author: Vijay Thakorlal, 2013-02-20, 19:49
RE: Namenode formatting problem - HDFS - [mail # user]
...Hi Keith,  When you run the format command on the namenode machine it actually starts the namenode, formats it then shuts it down (see: http://hadoop.apache.org/docs/stable/commands_man...
   Author: Vijay Thakorlal, 2013-02-19, 16:18
RE: Error for Pseudo-distributed Mode - Hadoop - [mail # user]
...Hi,     Could you first try running the example:  $ /usr/bin/hadoop jar /usr/lib/hadoop-0.20-mapreduce/hadoop-examples.jar grep input output 'dfs[a-z.]+'     Do you ...
   Author: Vijay Thakorlal, 2013-02-12, 14:34
RE: Reg Too many fetch-failures Error - HDFS - [mail # user]
...Hi Manoj,     As you may be aware this means the reduces are unable to fetch intermediate data from TaskTrackers that ran map tasks - you can try:  * increasing tasktracker.ht...
   Author: Vijay Thakorlal, 2013-02-01, 17:52
[expand - 1 more] - RE: Maximum Storage size in a Single datanode - MapReduce - [mail # user]
...Jeba,     I'm not aware of any hadoop limitations in this respect (others may be able to comment on this); since blocks are just files on the OS, the datanode will create subdirect...
   Author: Vijay Thakorlal, 2013-01-30, 12:16
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