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Re: Running terasort with 1 map task - Hadoop - [mail # user]
...http://wiki.apache.org/hadoop/HowManyMapsAndReduces  It is possible to have a single mapper if the input is not splittable BUT it is rarely seen as a feature. One could ask why you want...
   Author: Bertrand Dechoux, 2013-02-26, 11:25
Re: what will happen when HDFS restarts but with some dead nodes - Hadoop - [mail # user]
...Well, the documentation is more explicite.  Specifies the percentage of blocks that should satisfy the minimal replication requirement defined by* dfs.namenode.replication.min*.  W...
   Author: Bertrand Dechoux, 2013-01-30, 17:10
Re: Multi-threaded map task - Hadoop - [mail # user]
...Well... It all depends on where is your bottleneck. Do a benchmark for your use case if it is critical. Multi-threading might be useful not always. And you would rather want to avoid having ...
   Author: Bertrand Dechoux, 2013-01-14, 08:06
Re: Calling C inside MR - Hadoop - [mail # user]
...You provided the answer, JNI is a solution. Another one would be to use hadoop streaming if your program can read stdin and write into stdout with a good enough format. A MR job is, in the e...
   Author: Bertrand Dechoux, 2012-12-03, 12:54
[expand - 1 more] - Re: Loading Data to HDFS - Hadoop - [mail # user]
...I don't know what you mean by gateway but in order to have a rough idea of the time needed you need 3 values * amount of data you want to put on hadoop * hadoop bandwidth with regards to loc...
   Author: Bertrand Dechoux, 2012-10-30, 11:10
[expand - 1 more] - Re: Maps split size - Hadoop - [mail # user]
...Okay, then it would be because you didn't really change the block size. Of course, you might change the value of the property but the block size is actually something which is part of the fi...
   Author: Bertrand Dechoux, 2012-10-29, 06:15
[expand - 1 more] - Re: puzzled at the output - Hadoop - [mail # user]
...Combiner? And you are only using 'Text' as type?  Please do a real test with a specified input. We can only guess.  Bertrand  On Tue, Oct 2, 2012 at 6:52 PM, Chris Nauroth wro...
   Author: Bertrand Dechoux, 2012-10-02, 17:01
Re: Restricting the number of slave nodes used for a given job (regardless of the # of map/reduce tasks involved) - Hadoop - [mail # user]
...If that is only for benchmarking, you could stop the task-trackers on the machines you don't want to use. Or you could setup another cluster.  But yes, there is not standard way to limi...
   Author: Bertrand Dechoux, 2012-09-10, 11:18
Re: Using hadoop for analytics - Hadoop - [mail # user]
...Hi,  It would depend on the data volume mainly. Hadoop can be used to refine the data before inserting into a traditional architecture (like a database).  If you want to write jobs...
   Author: Bertrand Dechoux, 2012-09-05, 08:57
[HADOOP-8741] Broken links from "Cluster setup" to *-default.html - Hadoop - [issue]
...Hi,The links from the cluster setup pages to the configuration files are broken.http://hadoop.apache.org/common/docs/stable/cluster_setup.htmlRead-only default configurationhttp://hadoop.apa...
http://issues.apache.org/jira/browse/HADOOP-8741    Author: Bertrand Dechoux, 2012-08-30, 07:31
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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