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Re: Mappers vs. Map tasks - Hadoop - [mail # user]
...The wiki (or Hadoop The Definitive Guide) are good ressources.https://www.inkling.com/read/hadoop-definitive-guide-tom-white-3rd/chapter-7/input-formatsMapper is the name of the abstract cla...
   Author: Bertrand Dechoux, 2014-02-25, 08:38
Re: HDFS open file limit - Hadoop - [mail # user]
...At least for each machine, there is the *ulimit *that need to be verified.RegardsBertrandBertrand DechouxOn Sun, Jan 26, 2014 at 6:32 PM, John Lilley wrote: ...
   Author: Bertrand Dechoux, 2014-01-26, 20:23
Re: how to learn hadoop 2.2.0? - Hadoop - [mail # user]
...I would point you to ''Hadoop: The Definitive Guide'http://shop.oreilly.com/product/0636920021773.doNot everything has changed with the version 2 of Hadoop. If you are able tomaster all the ...
   Author: Bertrand Dechoux, 2014-01-26, 09:17
Re: HDFS block storage - Hadoop - [mail # user]
...1) Right now, I would say jira and code. 2) It is not really a flat storage. It 'folds' itself when needed. 3) At least checksums. There are jiras about whether it should be somehow in the b...
   Author: Bertrand Dechoux, 2013-07-15, 21:36
[expand - 1 more] - Re: Assignment of data splits to mappers - Hadoop - [mail # user]
...1) The tradeoff is between reducing the overhead of distributed computing and reducing the cost of failure. Less tasks, less overhead but the cost of failure will be bigger, mainly because t...
   Author: Bertrand Dechoux, 2013-06-18, 21:54
Re: recovery accidently deleted pig script - Hadoop - [mail # user]
...But no the script is not send to the cluster so you won't be able to recover from here because what is send is the 'interpretation' of the script. If that was the case, that would be a quest...
   Author: Bertrand Dechoux, 2013-06-13, 09:54
Re: how to get the time of a hadoop cluster, v0.20.2 - Hadoop - [mail # user]
...For hadoop, 'cluster time' is the local OS time. You might want to get the time of the namenode machine but indeed if NTP is correctly used, the local OS time from your server machine will b...
   Author: Bertrand Dechoux, 2013-05-17, 14:02
Re: disk used percentage is not symmetric on datanodes (balancer) - Hadoop - [mail # user]
...And by active, it means that it does actually stops by itself? Else it might mean that the throttling/limit might be an issue with regard to the data volume or velocity.  What threshold...
   Author: Bertrand Dechoux, 2013-03-18, 23:17
Re: Issue: Namenode is in safe mode - Hadoop - [mail # user]
...How was the namenode A relieved of its duty and what was the default replication factor?  If the replication factor was 1 and the datanode A was unplugged without any care then you lost...
   Author: Bertrand Dechoux, 2013-03-06, 10:02
Re: dfs.datanode.du.reserved - Hadoop - [mail # user]
...Not that I know. If so you should be able to identify each volume and as of now this isn't the case. BUT it can be done without Hadoop knowing about it, at the OS level, using different part...
   Author: Bertrand Dechoux, 2013-03-06, 09:25
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