Hadoop > common-user > September 2006

Hi, I'm curious why the new Writable interface was chosen rather than using Serializable. Handling version changes can be quite painful with standard serialization, but nothing seems to implement ...

Hi, is there a way to start hadoop with all its socket (namenode, datanode, tracker...) binded to localhost ? cheers -- Philippe GASSMANN Solutions & Technologies ANYWARE TECHNOLOGIES Tel : +33 ...

Hello, I have a larger XML file, over 10GB, has a simple format like <book <title </title <author </author ... </book I used to parse the XML and convert into another format, i.e. CSV. Currently, the ...

Hello everyone, I'm quite interested in such distributed filesystems but actually I cannot find this information anywhere: is Hadoop-DFS a POSIX compliant system ? Could I mount somehow (Fuse, NFS, ...

Hello, I have noticed that the Reducer does not enforce that the key is kept unaltered after the reduce operation. What would happen if output with a different key was collected? I realize that the ...

Hi all, Hadoop DFS in inspired to Google FS. Do they share all the assumptions listed in the Google File System documentation? (http://labs.google.com/papers/gfs.html : par. 2.1) In particular: must ...

Dear Hadoop Experts, The opening comments of the NameNode class state: "There is a single NameNode running in any DFS deployment. (Well, except when there is a second backup/failover NameNode.)" ...

Hi all: I want to process several logs files (which are collected from several severs) on hadoop, nor combine those files before import them into DFS system. Could it be carried out? Best Regards, ...

Hi, I'm new to hadoop. I was going through the steps on standalone operation under API docs where I encountered the below error. 06/09/15 10:42:12 INFO conf.Configuration: parsing ...

Hi, all I install hadoop-0.6.2 in windows through cygwin. I can run "grep" operation, but when I try to operate distributedly, Some error occured. I set the conf/hadoop-site.xml like as follows: ...

Hello, The SequenceFile and MapFile classes are just what I need to solve a specific problem I have in my application: store large key/value pairs on disk and lookup values from keys. However, I am ...

Dear Hadoopers: I'm using hadoop 0.5.0 (My job is a derivative of the nutch fetch job). I've had success in the past with older versions of hadoop but now jobs keep failing because one of the reduces ...

We have a setup where a search query goes to an aggregator who using ipc/nutch api to communicate to slaves who have a subset of lucene index on various machines.The slaves return their results which ...