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Re: Modifying Hadoop For join Operation - HDFS - [mail # user]
...Vikas,  Check the below paper on the different ways on performing joins in MR  http://lintool.github.com/MapReduceAlgorithms/index.html  Also, `Hadoop - The Definitive Guide` ...
   Author: Praveen Sripati, 2013-01-24, 16:52
Re: Newbie question on block size calculation - HDFS - [mail # user]
...Seek time is ~ 10ms. If seek time has to be 1% of the transfer time then transfer time has to be ~ 1000 ms (1s).  In ~ 1000 ms (1s) with a transfer rate of 100 MB/s, a block of 100MB ca...
   Author: Praveen Sripati, 2012-02-22, 14:46
Re: Rack Awareness behaviour - Loss of rack - HDFS - [mail # user]
...two  Below is from the 'Hadoop : The Definitive Guide'. So, with a replication of 2 or 3, the first and the second blocks should be placed on different racks. Not sure why they are gett...
   Author: Praveen Sripati, 2012-02-11, 03:39
Re: Setting up Federated HDFS - HDFS - [mail # user]
...Chandra,  In the namenode hdfs*xml, dfs.federation.nameservice.id is set to ns1, but ns1 is not being used in the xml for defining the name node properties..  Here are the instruct...
   Author: Praveen Sripati, 2012-02-09, 14:22
Re: HDFS Federation Exception - HDFS - [mail # user]
...Suresh,  Here is the JIRA - https://issues.apache.org/jira/browse/HDFS-2778  Regards, Praveen  On Wed, Jan 11, 2012 at 9:28 PM, Suresh Srinivas wrote:  ...
   Author: Praveen Sripati, 2012-01-11, 16:48
Fwd: HDFS Federation Exception - HDFS - [mail # user]
...Hi,  I am trying to setup a HDFS federation and getting the below error. Also, pasted the core-site.xml and hdfs-site.xml at the bottom of the mail. Did I miss something in the configur...
   Author: Praveen Sripati, 2012-01-11, 06:54
Re: NameNode Safe Mode and CheckPointing - HDFS - [mail # user]
...During the time the NN stops writing to the old edits file and creates a new edit file, will the file modifications work or not? Curious, how this is handled in the code.  Praveen  ...
   Author: Praveen Sripati, 2012-01-08, 05:27
Re: Configuring Fully-Distributed Operation - HDFS - [mail # user]
...At the minimum you need to specify the location of the namenode and the jobtracker in the configuration files for all the nodes and the client, rest of the properties are defaulted. Also, ba...
   Author: Praveen Sripati, 2011-12-27, 03:02
Re: HDFS HTTP client - HDFS - [mail # user]
...Also check WebHDFS (1). I think both Hoop and WebHDFS are not into Hadoop yet. Check the HDFS-2178 and HDFS-2316 JIRA for the status.  (1) - http://hortonworks.com/webhdfs-%E2%80%93-htt...
   Author: Praveen Sripati, 2011-12-06, 11:47
Re: SequenceFile with one very large value - HDFS - [mail # user]
...text files) after  a bunch of records, and that is the reason why your record does not split when read.  Sync is placed after every N records and is used for moving from an arbitra...
   Author: Praveen Sripati, 2011-12-05, 15:46
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