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[expand - 1 more] - Re: Combiners - Hadoop - [mail # user]
...ok.   When I meant 'Reducer with no other constraints' I meant Job.setCombinerClass takes a Class, not a Combiner class which enforces stricter constraints.  Thanks for listing the...
   Author: Mathias Herberts, 2011-10-31, 12:41
Re: Maintaining map reduce job logs - The best practices - Hadoop - [mail # user]
...Those logs in 'history/done' will get discarded after an unconfigurable (as of yet) delay set to 30 days IIRC.  Our strategy is to move those logs daily in 'history/archive' which won't...
   Author: Mathias Herberts, 2011-09-23, 13:13
Re: Hadoop integration with SAS - Hadoop - [mail # user]
...Forget sas, use pig instead. On Aug 23, 2011 11:22 PM,  wrote: link or samples or tools? privileged, proprietary, or otherwise private information. If you have received it in error, ple...
   Author: Mathias Herberts, 2011-08-23, 21:28
Re: Namenode Scalability - Hadoop - [mail # user]
...Just curious, what are the techspecs of your datanodes to accomodate 1PB/day on 20 nodes? On Aug 10, 2011 10:12 AM, "jagaran das"  wrote: Node Cluster). unresponsive when GC cycle kicks...
   Author: Mathias Herberts, 2011-08-10, 08:44
Re: Sanity check re: value of 10GbE NICs for Hadoop? - Hadoop - [mail # user]
...On Wed, Jun 29, 2011 at 01:02, Matei Zaharia  wrot e: file your target Hadoop workload and see whether it's communication-bound.  Hadoop jobs can definitely be communication-bound ...
   Author: Mathias Herberts, 2011-06-28, 23:05
Re: can our problem be handled by hadoop - Hadoop - [mail # user]
...Hi,  seems like the perfect use case for  Map Reduce yep.  2011/5/26 Mirko Kämpf : on h de out...
   Author: Mathias Herberts, 2011-05-26, 11:40
Re: distcp performing much better for rebalancing than dedicated balancer - Hadoop - [mail # user]
...Did you explicitely start a balancer or did you decommission the nodes using dfs.hosts.exclude and a dfsadmin -refreshNodes?  On Thu, May 5, 2011 at 14:30, Ferdy Galema  wrote at h...
   Author: Mathias Herberts, 2011-05-05, 12:57
Re: Does it mean that single disk failure causes the whole datanode to fail? - Hadoop - [mail # user]
...You can configure how many failed volumes a datanode can tolerate. On Apr 25, 2011 5:04 PM, "Xiaobo Gu"  wrote:...
   Author: Mathias Herberts, 2011-04-25, 16:17
Re: HDFS permission denied - Hadoop - [mail # user]
...Check the NN's logs to see the path which led to this. On Apr 24, 2011 8:41 AM, "Peng, Wei"  wrote:...
   Author: Mathias Herberts, 2011-04-24, 07:27
Re: Hadoop Speed Efficiency ?? - Hadoop - [mail # user]
...Hi Praveeenesh,  On Tue, Apr 19, 2011 at 07:06, praveenesh kumar  wrot e:  That's not the Hadoop's sweet spot, with the default block size (64Mb), none of those files will be ...
   Author: Mathias Herberts, 2011-04-19, 05:25
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