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From Harsh J <ha...@cloudera.com>
Subject Re: Netstat Shows Port 8020 Doesn't Seem to Listen
Date Mon, 09 Jan 2012 20:14:51 GMT
Eli,

What is your fs.default.name set to, in core-site.xml?

On Tue, Jan 10, 2012 at 1:07 AM, Eli Finkelshteyn <iefinkel@gmail.com> wrote:
> Positive. Like I said before, netstat -a | grep 8020 gives me nothing. Even
> if the firewall was the problem, that should still give me output that the
> port is listening, but I'd just be unable to hit it from an outside box (I
> tested this by blocking port 50070, at which point it still showed up in
> netstat -a, but was inaccessible through http from a remote machine). This
> problem is something else.
>
>
> On 1/9/12 2:31 PM, zGreenfelder wrote:
>>
>> On Mon, Jan 9, 2012 at 1:58 PM, Eli Finkelshteyn<iefinkel@gmail.com>
>>  wrote:
>>>
>>> More info:
>>>
>>> In the DataNode log, I'm also seeing:
>>>
>>> 2012-01-09 13:06:27,751 INFO org.apache.hadoop.ipc.Client: Retrying
>>> connect
>>> to server: localhost/127.0.0.1:8020. Already tried 9 time(s).
>>>
>>> Why would things just not load on port 8020? I feel like all the errors
>>> I'm
>>> seeing are caused by this, but I can't see any errors about why this
>>> occurred in the first place.
>>>
>> are you sure there isn't a firewall in place blocking port 8020?
>> e.g. iptables on the local machines?   if you do
>> telnet localhost 8020
>> do you make a connection? if you use lsof and/or netstat can you see
>> the port open?
>> if you have root access you can try turning off the firewall with
>> iptables -F to see if things work without firewall rules.
>
>



-- 
Harsh J

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