Details

    • Type: Bug Bug
    • Status: Closed
    • Priority: Major Major
    • Resolution: Duplicate
    • Affects Version/s: 0.12.3
    • Fix Version/s: 0.15.0
    • Component/s: ipc
    • Labels:
      None
    • Environment:

      Description

      Connecting to the TaskTracker with the default configuration fails with the firewall settings as mentioned in the Environment. This means the job seems to start, but then will hang with all tasks at 0%

      Also, setting mapred.tasktracker.dns.interface to 'lo' has no effect. I would expect this bound the TaskTracker in such way that local connections would be made.

      To make it work, I have to explicitly poke a hole in the firewall:

      1. hadoop
        iptables -A INPUT --protocol tcp --destination-port 50050 -j ACCEPT
        iptables -A OUTPUT --protocol tcp --destination-port 50050 -j ACCEPT

      While in practise a Hadoop will often run on a cluster (so the firewall has to be opened anyway), I don't think this should be the default behaviour, because it is highly confusing.

        Issue Links

          Activity

          Hide
          Owen O'Malley added a comment -

          This was fixed by HADOOP-1739, which makes it configurable and defaults the task tracker to 127.0.0.1.

          Show
          Owen O'Malley added a comment - This was fixed by HADOOP-1739 , which makes it configurable and defaults the task tracker to 127.0.0.1.
          Hide
          Eelco Lempsink added a comment -

          Sorry about the '1.'s, I wasn't aware that '#' signs would get converted.

          Show
          Eelco Lempsink added a comment - Sorry about the '1.'s, I wasn't aware that '#' signs would get converted.

            People

            • Assignee:
              Unassigned
              Reporter:
              Eelco Lempsink
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              Dates

              • Created:
                Updated:
                Resolved:

                Development