AnsweredAssumed Answered

map tasks are not started, status pending

Question asked by stu on Aug 24, 2012
Latest reply on Aug 25, 2012 by nabeel
After a single node (ubuntu 12.04 lts) installation of MapR, all started jobs hang at "map 0%, reduce 0%" (tried with the hadoop examples (wordcount and grepsort) and some own code). As I can see in the webadmin, all services are up and running so far.

As one can read often, there may be an issue with the DNS; but node-east1b-101 as well as resolve correctly to, not any local ip. The DNS test from the documentation results in:

    $ getent hosts `hostname` node-east1b-101
    $ hostname -f

and I also got

    $ ping
    PING ( 56(84) bytes of data.
    $ ping node-east1b-101
    PING ( 56(84) bytes of data.

So I think that's okay. The logs are available at:

 - jobtracker: [][1],
 - tasktracker [][2],
 - warden.log [][3].

I guess this problem shouldn't be that hard to solve, but as I'm a newbie to MR and hadoop, this requires some help ... so ... any ideas about that?