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 HTTP ERROR: 404 Problem accessing /. Reason: NOT_FOUND 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 10.139.9.231 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: /usr/lib/hadoop/storage/dfs/nn/current/edits.new 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 Hdfs-site.xml <configuration> <property> <name>dfs.replication</name> <value>2</value> </property> <property> <name>dfs.name.dir</name> <value>/usr/lib/hadoop/storage/dfs/nn</value> </property> <property> <name>dfs.data.dir</name> <value>/usr/lib/hadoop/storage/dfs/dn</value> </property> <property> <name>dfs.permissions</name> <value>false</value> </property> <property> <name>dfs.webhdfs.enabled</name> <value>true</value> </property> <property> <name>dfs.http.address</name> <value>HOSTNAME:50070</value> </property> <property> <name>dfs.secondary.http.address</name> <value>HOSTNAME:50090</value> </property> <property> <name>fs.checkpoint.dir</name> <value>/usr/lib/hadoop/storage/dfs/snn</value> </property> </configuration> /etc/hosts (Note I have also tried by commenting 127.0.0.1 entry in host file but the issue was not resolved) 127.0.0.1 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 Thanks Stuti ::DISCLAIMER:: ---------------------------------------------------------------------------------------------------------------------------------------------------- The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. E-mail transmission is not guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or may contain viruses in transmission. The e mail and its contents (with or without referred errors) shall therefore not attach any liability on the originator or HCL or its affiliates. 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