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131 discussions - 560 posts

  • Hi, I am migrating from Apache hadoop 0.20.205 to CDH3u3. I don't want to lose the data that is in the HDFS of Apache hadoop 0.20.205. How do I migrate to CDH3u3 but keep the data that I have on ...
    Austin ChungathAustin Chungath
    May 3, 2012 at 6:11 am
    May 9, 2012 at 11:26 am
  • Hi, I wonder if someone could give some pointers with a problem I'm having? I have a 7 machine cluster setup for testing and we have been pouring data into it for a week without issue, have learnt ...
    Darrell TaylorDarrell Taylor
    May 9, 2012 at 4:53 pm
    May 11, 2012 at 10:37 am
  • Hi, I wonder that if Hadoop can solve effectively the question as following: ========================================== input file: a.txt, b.txt result: c.txt a.txt: id1,name1,age1,.. ...
    May 29, 2012 at 10:13 am
    May 30, 2012 at 1:56 pm
  • Hi, We have a 5node cdh3u4 cluster running. When i try to do teragen/terasort some of the map tasks are Failed/Killed and the logs show similar error on all machines. 2012-05-22 09:43:50,831 INFO ...
    Sandeep Reddy PSandeep Reddy P
    May 22, 2012 at 2:02 pm
    May 22, 2012 at 6:14 pm
  • Hello, We have about 50 VMs and we want to distribute processing across them. However these VMs share a huge data storage system and thus their "virtual" HDD are all located in the same computer ...
    Pierre Antoine Du Bois De NauroisPierre Antoine Du Bois De Naurois
    May 17, 2012 at 8:39 pm
    May 18, 2012 at 10:28 am
  • Hi I am trying to configure Hadoop 1.0. in pseudodistributed mode. But when I run the pi example given in the hadoop distribution, I get the error mentioned in title. Can someone please help me and ...
    Waqas latifWaqas latif
    May 16, 2012 at 1:21 pm
    May 16, 2012 at 6:02 pm
  • Hi, i recently downloaded and successfully installed hadoop-1.0.1 in my ubuntu 10.04 LTS. I have hadoop-1.0.1.tar.gz downloaded and now i want to design map-reduce application. As suggested by some ...
    Ravi JoshiRavi Joshi
    May 17, 2012 at 1:18 pm
    Jul 1, 2012 at 4:42 pm
  • Hi Experts, I am fairly new to hadoop MapR and I was trying to run a matrix multiplication example presented by Mr. Norstadt under following link http://www.norstad.org/matrix-multiply/index.html. I ...
    Waqas latifWaqas latif
    May 25, 2012 at 9:43 am
    May 30, 2012 at 5:31 pm
  • Hi, all, I got the exception below in the mapper. I already have my global Hadoop heap at 5 GB, but is there a specific other setting? Or maybe I should troubleshoot for memory? But the same ...
    Mark KerznerMark Kerzner
    May 23, 2012 at 7:17 pm
    May 24, 2012 at 3:45 am
  • If I understand it right HOD is mentioned mainly for merging existing HPC clusters with hadoop and for testing purposes.. I cannot find what is the role of Torque here (just initial nodes ...
    Merto MertekMerto Mertek
    May 17, 2012 at 7:12 pm
    May 21, 2012 at 3:00 pm
  • Hi, I am novice in Hadoop. Kindly suggest how do we load log files into hdfs. Please suggest the command and steps. Thanks in advance!! -- View this message in context ...
    May 13, 2012 at 4:24 am
    May 15, 2012 at 2:04 am
  • I'm new to Hadoop and am trying to get it setup in Eclipse. I'm following the "Working with Hadoop under Eclipse" wiki to do this. First let me make sure this will do what I am hoping it will do. I'm ...
    Wilson Wayne - wwilsoWilson Wayne - wwilso
    May 7, 2012 at 10:10 pm
    May 8, 2012 at 6:14 pm
  • Hi , Has anyone used Hadoop and splunk, or any other real-time processing tool over Hadoop? Regards, Shreya This e-mail and any files transmitted with it are for the sole use of the intended ...
    Shreya PalShreya Pal
    May 18, 2012 at 7:11 pm
    May 28, 2012 at 1:15 pm
  • I have a rather large map reduce job which takes few days. I was wondering if its possible for me to freeze the job or make the job less intensive. Is it possible to reduce the number of slots per ...
    May 11, 2012 at 10:44 am
    May 11, 2012 at 3:59 pm
  • Hi, We are getting 100TB of data with replication factor of 3 this goes to 300TB of data. We are planning to use hadoop with 65nodes. We want to know which option will be better in terms of hardware ...
    Sandeep Reddy PSandeep Reddy P
    May 31, 2012 at 6:42 pm
    Jun 1, 2012 at 8:23 am
  • Hi, We are about to build a 10 machine cluster with 40Tb of storage, obviously as this gets full actually trying to create an offsite backup becomes a problem unless we build another 10 machine ...
    Darrell TaylorDarrell Taylor
    May 29, 2012 at 4:20 pm
    May 31, 2012 at 7:51 pm
  • Hi guys, this is a very simple program, trying to use TextInputFormat and SequenceFileoutputFormat. Should be easy but I get the same error. Here is my configurations ...
    Mark questionMark question
    May 29, 2012 at 7:57 pm
    May 30, 2012 at 6:32 pm
  • it seems that if I put too many records into the same mapper output key, all these records are grouped into one key one one reducer, then the reducer became out of memory. but the reducer interface ...
    May 9, 2012 at 6:51 pm
    May 11, 2012 at 5:58 am
  • Hi folks, (Resending to this group, sent to common-dev before, pretty sure that's for Hadoop internal development - sorry for that..) I'm pretty stuck here. I've been researching for hours and I ...
    Todd McFarlandTodd McFarland
    May 19, 2012 at 3:30 pm
    Sep 13, 2012 at 6:45 pm
  • All, We are trying to implement sqoop in our environment which has 30 mysql sharded databases and all the databases have around 30 databases with 150 tables in each of the database which are all ...
    Srinivas SurasaniSrinivas Surasani
    May 31, 2012 at 10:03 pm
    Jun 2, 2012 at 12:09 am
  • We get click data through API calls. I now need to send this data to our hadoop environment. I am wondering if I could open one sequence file and write to it until it's of certain size. Once it's ...
    Mohit AnchliaMohit Anchlia
    May 25, 2012 at 2:55 pm
    May 31, 2012 at 2:38 am
  • Hello Hadoop community, I have been trying to set up a double node Hadoop cluster (following the instructions in - ...
    Rohit PandeyRohit Pandey
    May 29, 2012 at 5:27 pm
    May 30, 2012 at 2:17 pm
  • Hi, I am trying to run few benchmarks on a small hadoop-cluster of 4 VMs (2 on 2 phyiscal hosts, each VM having 1 cpu core, 2GB ram, individual disk and Gbps bridged connectivity). I am using ...
    Akshay SinghAkshay Singh
    May 23, 2012 at 8:38 pm
    May 29, 2012 at 3:15 pm
  • I am using Cloudera distribution cdh3u1. When trying to check native codecs for better decompression performance such as Snappy or LZO, I ran into issues with random access using ...
    Jason BJason B
    May 21, 2012 at 10:57 pm
    May 22, 2012 at 4:54 pm
  • Hi, Is FileSystem.append supported on hadoop 1.0.x? (1.0.3 in particular). Reading this list I thought it was back in for 1.0, but it's disabled by default so I'm not 100% sure. It would be great to ...
    Rodney O'DonnellRodney O'Donnell
    May 18, 2012 at 6:43 am
    May 21, 2012 at 1:24 pm
  • Dear all, I have one single input file, which contains, on every line, some hydrological calibration models (data). Each line of the file should be processed and then the output from every line ...
    Biro lehelBiro lehel
    May 20, 2012 at 9:19 am
    May 20, 2012 at 11:14 am
  • Dear experts, Today is my tenth day working with Hadoop on installing on my windows machine. I am trying again and again because , some where someone has written that it works on Windows with ...
    Ravishankar NairRavishankar Nair
    May 18, 2012 at 1:50 am
    May 18, 2012 at 8:58 pm
  • Hi, I have a question to the hadoop experts: I have two HDFS, in different subnet. HDFS1 : 192.168.*.* HDFS2: 10.10.*.* the namenode of HDFS2 has two NIC. One connected to 192.168.*.* and another to ...
    Arindam ChoudhuryArindam Choudhury
    May 11, 2012 at 1:45 pm
    May 11, 2012 at 2:38 pm
  • Hi All, Which is the best monitoring tool for Hadoop cluster monitoring? Ganglia or Nagios? Thanks, Manu S
    Manu SManu S
    May 11, 2012 at 5:32 am
    May 11, 2012 at 9:20 am
  • We are looking at doing some initial analysis on SQL text info within the query runs to come up with some kind of path output to depict how various tables are linked to each other. For example. A ...
    Karanveer SinghKaranveer Singh
    May 10, 2012 at 7:47 am
    May 10, 2012 at 3:13 pm
  • So, I installed Hadoop on my imac via port install hadoop and after working through a few configuration issues tried to test the setup with calculation of PI. Unfortunately, I got this answer ...
    Alex ParanskyAlex Paransky
    May 9, 2012 at 12:36 am
    May 9, 2012 at 4:53 am
  • I am running a task which gets to 66% of the Reduce step and then hangs indefinitely. Here is the log file (I apologize if I am putting too much here but I am not exactly sure what is relevant) ...
    Keith ThompsonKeith Thompson
    May 2, 2012 at 9:50 pm
    May 4, 2012 at 4:52 pm
  • Hi All, Can we find out the complete block names from the fsimage we have? Scenario: Accidentally we had lost the hdfs data. We have the previous fsimage before the data loss. We have restored some ...
    Manu SManu S
    May 3, 2012 at 8:15 am
    May 3, 2012 at 10:02 am
  • Hi All, How to compare to input file In M/R Job. let A Log file around 30GB and B Log file size is around 60 GB I wanted to know how i will define <K,V inside the mapper. Thanks samir.
    Samir das mohapatraSamir das mohapatra
    May 23, 2012 at 7:47 pm
    May 24, 2012 at 6:19 pm
  • I have always wondered about this and and not sure as to phenomenon. When I fire a map reduce job to copy data over in a distributed fashion I would expect to see mappers executing the copy. What ...
    May 22, 2012 at 1:19 am
    May 22, 2012 at 7:37 pm
  • I have large volume of stream log data. Each data record contains a time stamp, which is very important to the analysis. For example, I have data format like this: (1) 20:30:21 01/April/2012 ...
    Zhiwei LinZhiwei Lin
    May 21, 2012 at 8:02 pm
    May 22, 2012 at 1:59 pm
  • Hi, I am trying to install pipes on os x following the instructions here I can compile utils, but not pipes itself. System: gcc version 4.2.1, java version "1.6.0_31" , OS X 10.7.3 hadoop: 1.0.3 When ...
    Peter CoganPeter Cogan
    May 21, 2012 at 11:08 am
    May 21, 2012 at 6:00 pm
  • Hi, I am a newbie on Hadoop and have a quick question on optimal compute vs. storage resources for MapReduce. If I have a multiprocessor node with 4 processors, will Hadoop schedule higher number of ...
    Satheesh KumarSatheesh Kumar
    May 11, 2012 at 4:51 pm
    May 16, 2012 at 4:50 pm
  • Hi, I am seeing an issue where Namenode does not start due an EOFException. The disk was full and I cleared space up but I am unable to get past this exception. Any ideas on how this can be resolved? ...
    Prashant KommireddiPrashant Kommireddi
    May 14, 2012 at 5:20 pm
    May 15, 2012 at 11:51 pm
  • Hi , I am new user to hadoop . I have installed hadoop0.19.1 on single windows machine. Its http://localhost:50030/jobtracker.jsp and http://localhost:50070/dfshealth.jsp pages are working fine but ...
    Mohit KundraMohit Kundra
    May 11, 2012 at 7:00 am
    May 11, 2012 at 12:55 pm
  • Hi I am running Hadoop-1.0.1 with Sun jdk1.6.0_23. My system is a head node with 14 compute blades When trying to start hadoop, I get the following message in the logs for each data node: 2012-05-09 ...
    Fourie JoubertFourie Joubert
    May 9, 2012 at 3:15 pm
    May 10, 2012 at 9:04 am
  • Hello All, As Apache Hadoop community is ready to release the next 2.0 alpha version of Hadoop , i would like to bring attention towards need to make better documentation of the tutorials and ...
    May 4, 2012 at 7:21 pm
    May 9, 2012 at 2:17 pm
  • Hi, I try to run a Hadoop reduce-side join, then I get the following: java.lang.NoClassDefFoundError: org/apache/hadoop/contrib/utils/join/DataJoinMapperBase at ...
    May 4, 2012 at 7:27 am
    May 4, 2012 at 10:57 am
  • It sounds like an exciting feature. Does anyone have tried this in practice? How does the hot standby namenode perform and how reliable is the HDFS recovery? Is it now a good chance to migrate to ...
    Shi YuShi Yu
    May 3, 2012 at 2:29 pm
    May 3, 2012 at 5:59 pm
  • Dear All, A very stupid question here. I installed Hadoop 1.0.1 in Ubuntu by deb provided. but how can I specify the hadoop installation directory in eclipse plugin. Thanks for every answer. robot ...
    May 2, 2012 at 10:34 am
    May 3, 2012 at 2:59 am
  • Is there a way to compress map only jobs to compress map output that gets stored on hdfs as part-m-* files? In pig I used : Would these work form plain map reduce jobs as well? set ...
    Mohit AnchliaMohit Anchlia
    May 1, 2012 at 12:25 am
    May 1, 2012 at 4:08 am
  • Hi All, Did any one work on hadoop with LDAP integration. Please help me for same. Thanks samir
    Samir das mohapatraSamir das mohapatra
    May 26, 2012 at 12:41 pm
    May 29, 2012 at 2:14 pm
  • Hi All, How to configure the external jar , which is use by application internally. For eample: JDBC ,Hive Driver etc. Note:- I dont have permission to start and stop the hadoop machine. So I need to ...
    Samir das mohapatraSamir das mohapatra
    May 26, 2012 at 12:49 pm
    May 27, 2012 at 4:59 am
  • Hi, I encounter a problem about when I install the LZO, after i install it, I found that it can run on Pig scripts and streaming scripts and when I check these jobs though jobtracker , it shows that ...
    May 23, 2012 at 9:55 am
    May 23, 2012 at 12:10 pm
  • Hi, I am using a Hadoop cluster of my own construction on EC2, and I am running out of hard drive space with maps. If I knew which directories are used by Hadoop for map spill, I could use the large ...
    Mark KerznerMark Kerzner
    May 22, 2012 at 1:29 pm
    May 22, 2012 at 2:02 pm
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175 users for May 2012

Harsh J: 59 posts Samir das mohapatra: 21 posts Shi Yu: 15 posts JunYong Li: 14 posts Michel Segel: 13 posts Darrell Taylor: 11 posts Robert Evans: 11 posts Nitin Pawar: 10 posts Sandeep Reddy P: 10 posts Waqas latif: 10 posts Austin Chungath: 9 posts Mark Kerzner: 8 posts Serge Blazhiyevskyy: 8 posts Pierre Antoine Du Bois De Naurois: 7 posts Prashant Kommireddi: 7 posts Raj Vishwanathan: 7 posts Yingnan.ma: 7 posts Abhishek Pratap Singh: 6 posts Arun C Murthy: 6 posts Jay Vyas: 6 posts
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