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Re: Hadoop client user - HDFS - [mail # user]
...The user1 will mainly require a home directory on the HDFS, created by the HDFS administrator user ('hadoop' in your case): sudo -u hadoop hadoop fs -mkdir /user/user1; sudo -u hadoop hadoop...
   Author: Harsh J, 2013-08-29, 05:25
Re: There are 2 datanode(s) running and 2 node(s) are excluded in this operation. - HDFS - [mail # user]
...The client side exclusion has nothing to do with dfs.hosts.exclude. Its more than likely that the distcp command is unable to query one of the HDFS' clusters' DNs, and is therefore excluding...
   Author: Harsh J, 2013-08-28, 10:26
Re: Namenode joining error in HA configuration - HDFS - [mail # user]
...Thanks. I don't believe we support Solaris 10 (i.e. we do not intensively test over it), but what that piece behind the failure does is execute "bash -c exec 'df -k /namedirpath'". If such a...
   Author: Harsh J, 2013-08-28, 08:37
Re: Create a file in local file system in map method - HDFS - [mail # user]
...Can you share what error you run into in trying to write to a local filesystem location from within a map task?  Note that the map tasks will run as the same user as the TaskTracker dae...
   Author: Harsh J, 2013-08-22, 10:18
Re: about append - HDFS - [mail # user]
...Append implementation in 1.x was the first take, and was found to carry a few important issues, for which it therefore received a newer implementation in what's now 0.23.x/2.x. Read https://...
   Author: Harsh J, 2013-08-20, 17:13
Re: when Standby Namenode is doing checkpoint, the Active NameNode is slow. - HDFS - [mail # user]
...Perhaps turning on fsimage compression may help. See documentation of dfs.image.compress at http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-hdfs/hdfs-default.xml.  You ...
   Author: Harsh J, 2013-08-13, 10:36
Re: Unable to load native-hadoop library for your platform - HDFS - [mail # user]
...If you use tarballs, you will need to build native libraries for your OS. Follow instructions for native libraries under src/BUILDING.txt of a source tarball.  Alternatively, pick up Ap...
   Author: Harsh J, 2013-08-13, 03:06
Re: Jobtracker page hangs ..again. - HDFS - [mail # user]
...If you're not already doing it, run a local name caching daemon (such as ncsd, etc.) on each cluster node. Hadoop does a lot of lookups and a local cache would do good in reducing the load o...
   Author: Harsh J, 2013-08-13, 03:01
Re: Hadoop upgrade - HDFS - [mail # user]
...The link Jitendra provided lists all the changes exhaustively. What are you exactly looking for beyond that? For Performance related changes, they are probably noted, so just search the same...
   Author: Harsh J, 2013-08-09, 14:34
Re: MutableCounterLong metrics display in ganglia - HDFS - [mail # user]
...The counter, being num-ops, should up-count and not reset. Note that your test may be at fault though - calling hsync may not always call NN#fsync(…) unless you are passing the proper flags ...
   Author: Harsh J, 2013-08-09, 14:06
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