Please find a part of krb5.cnf   dns_lookup_realm = false   dns_lookup_kdc = false   ticket_lifetime = 24h   renew_lifetime = 7d   forwardable = true ... View more

I found out that principal of namenode : hdfs/[email protected] hostname : xyz.paris.com hostname --fqdn : xyz.munich.com   So from above 3 values you can see that hostname is not same as principal and FQDN. But as per my knowledge, only FQDN matters. Still, do you think incorrect hostname can cause this issue? ... View more

Hi Harsh,   I am getting below exception on the namenode though it doesnt affect my services. But once there wasnt an automatic failover though it was enabled. I found out following error logs : . .   Forwardable Ticket true Forwarded Ticket false Proxiable Ticket false Proxy Ticket false Postdated Ticket false Renewable Ticket false Initial Ticket false Auth Time = Wed Feb 03 13:49:37 CET 2016 Start Time = Wed Feb 03 13:49:40 CET 2016 End Time = Wed Feb 03 23:49:37 CET 2016 Renew Till = null Client Addresses  Null 2016-02-03 14:49:49,093 ERROR org.apache.hadoop.hdfs.server.namenode.ha.StandbyCheckpointer: Exception in doCheckpoint java.io.IOException: Exception during image upload: java.io.IOException: org.apache.hadoop.security.authentication.client.AuthenticationException: GSSException: No valid credentials provided (Mechanism level: Server not found in Kerberos database (7))         at org.apache.hadoop.hdfs.server.namenode.ha.StandbyCheckpointer.doCheckpoint(StandbyCheckpointer.java:221)         at org.apache.hadoop.hdfs.server.namenode.ha.StandbyCheckpointer.access$1400(StandbyCheckpointer.java:62)         at org.apache.hadoop.hdfs.server.namenode.ha.StandbyCheckpointer$CheckpointerThread.doWork(StandbyCheckpointer.java:353)         at org.apache.hadoop.hdfs.server.namenode.ha.StandbyCheckpointer$CheckpointerThread.access$700(StandbyCheckpointer.java:260)         at org.apache.hadoop.hdfs.server.namenode.ha.StandbyCheckpointer$CheckpointerThread$1.run(StandbyCheckpointer.java:280)         at java.security.AccessController.doPrivileged(Native Method)         at javax.security.auth.Subject.doAs(Subject.java:360)         at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1651)         at org.apache.hadoop.security.SecurityUtil.doAsLoginUserOrFatal(SecurityUtil.java:410)         at org.apache.hadoop.hdfs.server.namenode.ha.StandbyCheckpointer$CheckpointerThread.run(StandbyCheckpointer.java:276) Caused by: java.io.IOException: org.apache.hadoop.security.authentication.client.AuthenticationException: GSSException: No valid credentials provided (Mechanism level: Server not found in Kerberos database (7))         at org.apache.hadoop.hdfs.server.namenode.TransferFsImage.uploadImage(TransferFsImage.java:298)         at org.apache.hadoop.hdfs.server.namenode.TransferFsImage.uploadImageFromStorage(TransferFsImage.java:222)         at org.apache.hadoop.hdfs.server.namenode.ha.StandbyCheckpointer$1.call(StandbyCheckpointer.java:207) .. . . . .   ... View more