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Date: Tue, 17 Apr 2007 15:43:15 -0700 (PDT)
From: "Eelco Lempsink (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Commented: (HADOOP-1265) TaskTracker won't bind to localhost
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    [ https://issues.apache.org/jira/browse/HADOOP-1265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12489567 ] 

Eelco Lempsink commented on HADOOP-1265:
----------------------------------------

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

> TaskTracker won't bind to localhost
> -----------------------------------
>
>                 Key: HADOOP-1265
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1265
>             Project: Hadoop
>          Issue Type: Bug
>          Components: ipc
>    Affects Versions: 0.12.3
>         Environment: The firewall looks (something) like this:
> iptables -P INPUT ACCEPT
> iptables -P FORWARD ACCEPT
> iptables -P OUTPUT ACCEPT
> iptables -Z
> # all local connections are OK
> iptables -A INPUT --destination 127.0.0.1 --in-interface lo -j ACCEPT
> iptables -A OUTPUT --destination 127.0.0.1 --out-interface lo -j ACCEPT
> # accept all traffic that originates internally
> iptables -A INPUT --match state --state RELATED,ESTABLISHED -j ACCEPT
> iptables -A OUTPUT --match state --state RELATED,ESTABLISHED -j ACCEPT
> # <snip: open some ports>
> # default target is drop for all unspecified packets
> iptables -P INPUT DROP
> iptables -P FORWARD DROP
> iptables -P OUTPUT DROP
>            Reporter: Eelco Lempsink
>
> 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:
> # 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.

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