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[expand - 1 more] - Re: datanode to blocks mapping - Hadoop - [mail # dev]
...Selwa,  I'm glad I could help. I suggest you import the source code in an IDE (we use Eclipse) and navigate around it. The outline view in Eclipse is a lifesaver :)  BlocksMap does...
   Author: Ravi Prakash, 2012-02-16, 16:59
Re: Send Data and Message to all nodes - Hadoop - [mail # user]
...Take a look at distributed cache for distributing data to all nodes. I'm not sure what you mean by messages. The MR programming paradigm is different from MPI.  http://hadoop.apache.org...
   Author: Ravi Prakash, 2012-01-29, 01:11
Re: [DISCUSS] Stop support for non-packaged i.e. developer build single-node installs - Hadoop - [mail # dev]
...I think also at issue is the maven build system. I don't know if its intended, but if I change a single .java file, "mvn -Pdist -P-cbuild -Dmaven.javadoc.skip -DskipTests install" runs a TON...
   Author: Ravi Prakash, 2012-01-18, 20:35
Re: 0 tasktrackers in jobtracker but all datanodes present - Hadoop - [mail # user]
...Courtesy Kihwal and Bobby  Have you tried increasing the max heap size with -Xmx? and make sure that you have swap enabled.  On Wed, Jan 11, 2012 at 6:59 PM, Gaurav Bagga  wro...
   Author: Ravi Prakash, 2012-01-12, 23:50
Re: Package/call a binary in hadoop job - Hadoop - [mail # user]
...Couldn't you write a simple wrapper around your binary, include the binary using the -file option and use Streaming?  Or use the distributed cache to copy your binaries to all the compu...
   Author: Ravi Prakash, 2012-01-11, 03:37
[expand - 1 more] - Re: problem of lost name-node - Hadoop - [mail # dev]
...Hi,  @Mirko: Please file a JIRA. This seems an appropriate time.  @Steve: If we store the absolute filenames (i.e. the whole path), would we still have the problem you outlined in ...
   Author: Ravi Prakash, 2011-09-29, 14:13
Re: JIRA attachments order - Hadoop - [mail # dev]
...But what if I want to see an incremental diff between two patches? I don't want to review the whole patch everytime. Maybe I just want to re-review the changes made to a patch. I would then ...
   Author: Ravi Prakash, 2011-09-09, 18:08
[expand - 3 more] - Re: IMAGE_AND_EDITS Failed - Hadoop - [mail # user]
...Can you hexdump the edits file, write something to HDFS, hexdump again and then compare the two hexdumps? Are you sure you're looking at the correct fsedits file? How many storage directorie...
   Author: Ravi Prakash, 2011-09-07, 17:21
Re: Namenode not starting - Hadoop - [mail # dev]
...Hi Abhishek,  Try reading through the shell scripts before postiing. They are short and simple enough and you should be able to debug them quite easily. I've seen the same error many ti...
   Author: Ravi Prakash, 2011-09-01, 22:25
Re: Starting datanode in secure mode - Hadoop - [mail # user]
...In short you MUST use priviledged resourced.  In long:  Here's what I did to setup a secure single node cluster. I'm sure there's other ways, but here's how I did it.    ...
   Author: Ravi Prakash, 2011-08-31, 04:00
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB