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11 discussions - 42 posts

  • Hello everybody, I'll ask my first question on this forum and hopefully start building more and more understanding of hadoop so that we can eventually contribute actively. In the meanwhile, I have a ...
    Gianlorenzo ThioneGianlorenzo Thione
    May 24, 2006 at 3:06 am
    May 25, 2006 at 8:34 pm
  • I am trying to read a MapFile inside mapper and reducer implementations. So far the only way I have found to do it is by opening a new reader for each map and reduce call. Is anybody doing something ...
    Dennis KubesDennis Kubes
    May 25, 2006 at 3:31 pm
    May 25, 2006 at 5:26 pm
  • I am trying to understand what happens during the time duration when Map task got finished and reduce task starts executing. I have 2 machines with 4 process + 4 Gigs on each with NFS (not dfs) to ...
    Vijay MurthiVijay Murthi
    May 25, 2006 at 5:18 pm
    May 25, 2006 at 7:09 pm
  • Hi all, I am trying to process several gigs of zipped text files from a directory. If I unzip them the size increase atleast 4 times and potentially I can run out of disk space. Has anyone tried to ...
    Vijay MurthiVijay Murthi
    May 11, 2006 at 5:43 pm
    May 19, 2006 at 5:15 pm
  • Hi! I am new to hadoop as well as cygwin, and as far as I know, you need to use cygwin in order to use hadoop on win. Unfortunately I'm not allowed to switch to linux or even use a linux machine to ...
    Krzysztof KucybałaKrzysztof Kucybała
    May 23, 2006 at 12:40 pm
    May 24, 2006 at 8:50 pm
  • I am seeing a lot of these kind of messages in the namenode log file. Can somebody point me in the right direction as to why this might be happening? DIR* FSDirectory.mkdirs: failed to create ...
    Dennis KubesDennis Kubes
    May 23, 2006 at 4:21 pm
    May 23, 2006 at 4:40 pm
  • Hi, I am looking for a distributed file system for large numbers of small files (a few KB each). Maybe the files would be rows in HDFS. But my access patterns are different from MapRed-style jobs: ...
    Manuel SimoniManuel Simoni
    May 16, 2006 at 5:38 pm
    Jul 11, 2006 at 11:44 am
  • Hi all, Many reduce tasks seems stall for a long time on "reduce copy" status especially they all wait on one map task transfer example task_0048_m_000120_0@node 10:50040. So the status is like ...
    Vijay MurthiVijay Murthi
    May 31, 2006 at 8:13 pm
    Jun 5, 2006 at 6:16 pm
  • How would I set the map output value class to be different from the reduce output value class. I am trying the code below but it doesn't seem to work. It throws an error saying WordWeights is not ...
    Dennis KubesDennis Kubes
    May 30, 2006 at 6:22 pm
    May 30, 2006 at 6:26 pm
  • Am I right in understanding that MapReduce tasks are not pushed to TaskTrackers by the JobTracker, but that the TaskTrackers continually poll the JobTracker for a Task to run and the JobTracker then ...
    Dennis KubesDennis Kubes
    May 24, 2006 at 5:09 pm
    May 24, 2006 at 5:15 pm
  • I am trying to run 8 map tasks with 2 reduce on 3 machines. Each task runs on a 6 MB text file and 500 such files. The monitoring page shows very few number of Map tasks running than intended. ...
    Vijay MurthiVijay Murthi
    May 12, 2006 at 1:14 am
    May 12, 2006 at 1:14 am
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