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From: Apache Wiki <wikidiffs@apache.org>
To: Apache Wiki <wikidiffs@apache.org>
Date: Tue, 11 Jun 2013 10:43:29 -0000
Message-ID: <20130611104329.67733.82139@eos.apache.org>
Subject: 
 =?utf-8?q?=5BHadoop_Wiki=5D_Update_of_=22ConnectionRefused=22_by_SteveLou?=
 =?utf-8?q?ghran?=
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The "ConnectionRefused" page has been changed by SteveLoughran:
https://wiki.apache.org/hadoop/ConnectionRefused?action=3Ddiff&rev1=3D5&rev=
2=3D6

Comment:
note that you can expect to see this in cluster teardown -and not to worry =
if you d

  You get a ConnectionRefused Exception when there is a machine at the addr=
ess specified, but there is no program listening on the specific TCP port t=
he client is using -and there is no firewall in the way silently dropping T=
CP connection requests. If you do not know what a TCP connection request is=
, please consult the [[http://www.ietf.org/rfc/rfc793.txt|specification]].
  =

  Unless there is a configuration error at either end, a common cause for t=
his is the Hadoop service isn't running.
+ =

+ This stack trace is very common when the cluster is being shut down -beca=
use at that point Hadoop services are being torn down across the cluster, w=
hich is visible to those services and applications which haven't been shut =
down themselves. Seeing this error message during cluster shutdown is not a=
nything to worry about.
+ =

+ If the application or cluster is not working, and this message appears in=
 the log, then it is more serious.
  =

   1. Check the hostname the client using is correct
   1. Check the IP address the client gets for the hostname is correct.