Hi Neeraj, This error doesn't look to be kerberos related initially. Can you verify if 192.168.49.51 has the tasktracker process running?
Regards, Robert On Tue, May 28, 2013 at 7:58 PM, Rahul Bhattacharjee < rahul.rec....@gmail.com> wrote: > The error looks a little low level , network level . The http server for > some reason couldn't bind to the port. > Might have nothing to do with Kerborose. > > Thanks, > Rahul > > > On Tue, May 28, 2013 at 6:36 PM, Neeraj Chaplot <geek...@gmail.com> wrote: > >> Hi All, >> >> When hadoop started with Kerberos authentication hadoop fs commands work >> well but MR job fails. >> >> Simple wordcount program fails at reducer stage giving follwoing >> exception : >> 013-05-28 17:43:58,896 WARN org.apache.hadoop.mapred. >> ReduceTask: attempt_201305281729_0003_r_000000_1 copy failed: >> attempt_201305281729_0003_m_000000_0 from 192.168.49.51 >> 2013-05-28 17:43:58,897 WARN org.apache.hadoop.mapred.ReduceTask: >> java.net.ConnectException: Connection refused >> at java.net.PlainSocketImpl.socketConnect(Native Method) >> at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351) >> at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213) >> at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200) >> at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366) >> at java.net.Socket.connect(Socket.java:529) >> at sun.net.NetworkClient.doConnect(NetworkClient.java:158) >> at sun.net.www.http.HttpClient.openServer(HttpClient.java:394) >> at sun.net.www.http.HttpClient.openServer(HttpClient.java:529) >> at sun.net.www.http.HttpClient.<init>(HttpClient.java:233) >> at sun.net.www.http.HttpClient.New(HttpClient.java:306) >> at sun.net.www.http.HttpClient.New(HttpClient.java:323) >> at >> sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:970) >> at >> sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:911) >> at >> sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:836) >> at >> org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.getInputStream(ReduceTask.java:1618) >> at >> org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.setupSecureConnection(ReduceTask.java:1575) >> at >> org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.getMapOutput(ReduceTask.java:1483) >> at >> org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.copyOutput(ReduceTask.java:1394) >> at >> org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.run(ReduceTask.java:1326) >> >> Please provide some inputs to fix the issue. >> >> Thanks >> >> >
