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
