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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
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
[HADOOP-8791] rm "Only deletes non empty directory and files." - Hadoop - [issue]
...The documentation (1.0.3) is describing the opposite of what rm does.It should be  "Only delete files and empty directories."With regards to file, the size of the file should not matter...
http://issues.apache.org/jira/browse/HADOOP-8791    Author: Bertrand Dechoux, 2013-02-06, 17:05
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
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
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