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Re: Good idea to run NameNode and JobTracker on same machine? - Hadoop - [mail # user]
...It depends on the size of your cluster. I think you can combine them together if your cluster has less than 10 machines.   Jeff Zhang     On Thu, Nov 26, 2009 at 6:26 AM, Raym...
   Author: Jeff Zhang, 2009-11-26, 15:01
[expand - 1 more] - Re: How to handle imbalanced data in hadoop ? - Hadoop - [mail # user]
...agree, the worst case for quick sort is O(n2) if all the data is the same.  and in this case the running for heapsort is O(n*log n)  Jeff Zhang   On Tue, Nov 24, 2009 at 7:35 ...
   Author: Jeff Zhang, 2009-11-24, 16:09
Re: Saving Intermediate Results from the Mapper - Hadoop - [mail # user]
...Hi Jason,  which option is for setting disable the removal of intermediate data ?  Thank you  Jeff Zhang   On Mon, Nov 23, 2009 at 10:27 AM, Jason Venner wrote:  ...
   Author: Jeff Zhang, 2009-11-23, 02:38
[expand - 3 more] - Re: Starting Hadoop cluster on EC2 - Hadoop - [mail # general]
...The ssh is installed on ec2 by default, otherwise you have no way to login to ec2   Jeff Zhang    On Sun, Nov 22, 2009 at 8:09 AM, Something Something  wrote:  ...
   Author: Jeff Zhang, 2009-11-22, 16:19
[expand - 1 more] - Re: Is the mapper output type must the same as reducer if combiner is used ? - Hadoop - [mail # user]
...karthik,  In your case, then the Combiner is not the same as Reducer. So it is not necessary to make the combiner same as reducer, right?  Thank you  Jeff Zhang   2009/11...
   Author: Jeff Zhang, 2009-11-22, 15:41
[expand - 1 more] - Re: to get hadoop working around with multiple users on the same instance - Hadoop - [mail # user]
...On Fri, Nov 20, 2009 at 4:39 PM, Siddu  wrote:   *    You can still connect the machine if it run  pseudo distributed file system. But in the configuration files, us...
   Author: Jeff Zhang, 2009-11-20, 09:46
[expand - 1 more] - Re: architecture help - Hadoop - [mail # user]
...The easiest way is making your connection pool class as the static member of your mapper class.   Jeff Zhang   On Mon, Nov 16, 2009 at 7:33 AM, yz5od2 wrote:  ...
   Author: Jeff Zhang, 2009-11-16, 16:49
Re: no jobtracker to stop,no namenode to stop - Hadoop - [mail # user]
...look at the logs of job tracker, maybe you will get some clues.   Jeff Zhang    On Mon, Nov 16, 2009 at 6:45 AM, Prabhu Hari Dhanapal  wrote:  ...
   Author: Jeff Zhang, 2009-11-16, 14:57
Re: Any Way to SSH to a remote Hadoop Machine - Hadoop - [mail # user]
...Of course, you can ssh to remote hadoop cluster.  And also you can edit and compile your code outside cluster, and then submit your jar to cluster to execute your map reduce jobs.  ...
   Author: Jeff Zhang, 2009-11-16, 06:34
Re: How hard would it be to put Hadoop on an EC2 machine? - Hadoop - [mail # user]
...You can use the distribution of cloudera, it's very easy to install hadoop on ec2.  http://archive.cloudera.com/docs/ec2.html   Jeff Zhang   On Mon, Nov 16, 2009 at 1:24 PM, M...
   Author: Jeff Zhang, 2009-11-16, 05:34
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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