Hi All,

I am suddenly started facing issue on Hadoop Cluster. Seems like HTTP request at port 50070 on dfs is not working properly.
I have an Hadoop cluster which is operating from several days. Recently we are also not able to see dfshealth.jsp page from webconsole.

Problems :
1. http://<Hostname>:50070/dfshealth.jsp<http://%3cHostname%3e:50070/dfshealth.jsp> shows following error

Problem accessing /. Reason:

2. SNN is not able to roll edits :
ERROR in SecondaryNameNode Log
java.io.FileNotFoundException: http://HOSTNAME:50070/getimage?getimage=1
       at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1401)
       at org.apache.hadoop.hdfs.server.namenode.TransferFsImage.getFileClient(TransferFsImage.java:160)
       at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode$3.run(SecondaryNameNode.java:347)
       at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode$3.run(SecondaryNameNode.java:336)
       at java.security.AccessController.doPrivileged(Native Method)
       at javax.security.auth.Subject.doAs(Subject.java:416)
       at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1093)
       at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.downloadCheckpointFiles(SecondaryNameNode.java:336)
       at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.doCheckpoint(SecondaryNameNode.java:411)
       at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.doWork(SecondaryNameNode.java:312)
       at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.run(SecondaryNameNode.java:275)

ERROR in Namenode Log
2014-01-31 18:15:12,046 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Roll Edit Log from
2014-01-31 18:15:12,046 WARN org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Cannot roll edit log, edits.new files already exists in all healthy directories:

Namenode logs which suggest that webserver is started on 50070 successfully:
2014-01-31 14:42:35,208 INFO org.apache.hadoop.http.HttpServer: Port returned by webServer.getConnectors()[0].getLocalPort() before open() is -1. Opening the listener on 50070
2014-01-31 14:42:35,209 INFO org.apache.hadoop.http.HttpServer: listener.getLocalPort() returned 50070 webServer.getConnectors()[0].getLocalPort() returned 50070
2014-01-31 14:42:35,209 INFO org.apache.hadoop.http.HttpServer: Jetty bound to port 50070
2014-01-31 14:42:35,378 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: Web-server up at: HOSTNAME:50070







/etc/hosts (Note I have also tried by commenting entry in host file but the issue was not resolved)       localhost

IP1    Hostname1         # Namenode- vm01 - itself
IP2    Hostname2         # DataNode- vm02

# The following lines are desirable for IPv6 capable hosts
::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
Note : All Hadoop daemons are executing fine and the jobs are running properly.

How to resolve this issue, I have tried many options provided on different forums but still facing the same issue.
I belive that this can cause a major problem later as my edits are not getting rolled into fsimage.. This can cause me a data loss in case of failure.

Please suggest

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